Landsat Acronyms

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0-9

0R	Zero Reformatted Data
3DEP	3D Elevation Program
3DNTM	3D National Topography Model
6H	Band 6 - high gain
6L	Band 6 - low gain
6S	Second Simulation of a Satellite Signal in the Solar Spectrum

A&A	Authorization and Authentication Archive and Access Associate Administrator
A&E	Access and Exploration
A&P	Archive and Production
A&P OPS	Archive and Production Operations
A/D	Analog/Digital
AA	Active Archive Alternative Analysis Associated Administrator
AAC	Archive Advisory Committee
AADP	Active Archive Data Package
AAG	Association of American Geographers
AAOS	Albers Automatic Ordering System
AAR	After-Action Report
AAS	Anomaly Analysis Subsystem
AATHom	Average Across-Track Homogeneity
ABI	Advanced Baseline Imager
ABML	As-Built Materials List
ABPL	As-Built Parts List
ABS	Absolute
AC	Alternate Current Archive Cache Actual Cost
ACA	Antenna Control Assembly
ACCA	Automated Cloud Cover Assessment Actual Cloud Cover Average
ACCESS	Advancing Collaborative Connections for Earth System Science
ACIX	Atmospheric Correction Intercomparison eXercise
ACK	Acknowledgement
ACL	Access Control List
ACM	AWS Certificate Manager
ACQ	Acquired Scenes Report
ACRES	Australian Center for Remote Sensing
ACS	Attitude Control System
ACIO	Associate Chief Information Officer
ACSG	Atmospheric Composition Subgroup
ACSLS	Automated Cartridge System Library Software
ACTHom	Average Cross-Track Homogeneity
ACU	Antenna Control Unit
ACWP	Actual Cost of Work Performed
AD	Active Directory Associate Director
ADA	Angular Displacement Assembly Attitude Displacement Assembly
ADAT	Application and Data Assessment
ADC	After DC Restore Ancillary Data Corrector Analog-to-Digital Conversion
ADD	Algorithm Description Document
ADF	Ancillary Data File
ADFS	Active Directory Federation Services
ADIC	Advanced Digital Information Corporation
ADM	Administrative Message
ADML	As-Designed Materials List
ADP	Ancillary Data Preprocessor
ADPL	As-Designed Parts List
ADS	Attitude Displacement Sensors Angular Displacement Sensor Archive Data Stager
ADSA	Attitude Displacement Sensor Assembly
ADVP	Algorithm Development and Verification Plan
AE	Archive Element
AEA	Albers Equal Area
AEC	Aerosol Extinction Coefficient
AEM	Auxiliary Electronics Module
AERONET	Aerosol Robotic Network
AES	Advanced Encryption Standard
AETD	Applied Engineering and Technology Directorate
AFB	United States Air Force Base
AFM	Anomalous Frame Manager
AFOLU	Agriculture, Forestry, and Other Land Use
AFOV	Angular Field of View
AFWA	Air Force Weather Agency
AGC	Automatic Gain Control
AGE	Automated Ground Equipment
AGRI	Australian Geographic Reference Image
AGS	Alaska Ground Station
AGU	American Geophysical Union
AI	Artificial Intelligence
AI&T	Assembly, Integration, and Test
AIM	Algorithm Integration Meeting
AIP	Archival Information Package Annex Implementation Plan
AIS	Automated Information Security
AIT	Algorithm Implementation Team
AJAX	Asynchronous Java Script and XML
ALG	Application Layer Gateway
ALI	Advanced Land Imager
ALIAS	Advanced Land Image Assessment System
AM	Artifact Mask or Analytical Modeler
AMI	Amazon Machine Image
AMP	Allocation Management Planner Asset Management Plan
AMQP	Advanced Message Queuing Protocol
AMTS	Asset Management Tracking System
AN	Ascending Node
ANC	Ancillary File
ANG	Angle band coefficients file extension
ANGCF	Angle Coefficient
ANGSTT	Australian National Ground Segment Technical Team
ANN	Annotation File
ANS	Alerts and Notifications
ANSI	American National Standards Institute
ANSS	Advanced National Seismic System
ANTLR	Another Tool for Language Recognition
AO	Authorization Official Authorizing Official
AOD	Aerosol Optical Depth
AOI	Area of Interest
AOS	Acquisition of Signal Arrival On-Site Automated Ordering System Advanced Orbiting Systems
AOT	Aerosol Optical Thickness
APAC	Acquisition Procurement Advisory Council
API	Application Programming Interface
APID	Application Identification
APMC	Agency Program Management Council
APO	Accountable Property Officer
APU	Accuracy, Precision, and Uncertainty
AQ	Advanced Queuing
AQPSK	Asynchronous Quadrature Phase Shift Keying
AR	Archive or Axial Ratio Acceptance Review Aquatic Reflectance
ARB	Architecture Review Board Anomaly Review Board
ARC	Advanced Research Computing
ARD	Analysis Ready Data
ARM	Atmospheric Radiation Measurement
ARN	Amazon Resource Name
ARP	Anomaly Resolution Plan
ARS	Agricultural Research Service
ART	Anomaly Resolution Team
AS	Archive Server
ASA	Archive Server Application Alice Springs [Station] Australia Australian Space Agency
ASB	Administrative Services Branch
ASC	Architecture Scorecard
ASCII	American Standard Code for Information Interchange
ASD	Analytical Spectral Devices, Inc.
ASGUI	Archive Server Graphical User Interface
ASHRAE	American Society of Heating, Refrigeration and Air-Conditioning
ASIC	Application Specific Integrated Circuit
ASIC3	Achieving Satellite Instrument Calibration for Climate Change
ASL	Amazon States Language
ASM	Attached Sync Marker Automatic Storage Management
ASN	Alice Springs Ground Station Australian Network
ASPRS	American Society of Photogrammetry and Remote Sensing
ASQC	American Society for Quality Control
AST	Active Scan Time, Architecture Study Team
ASTER	Advanced Spaceborne Thermal Emission and Reflection
ASTER GED	Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Emissivity Dataset
ASTM	American Society for Testing of Materials
ASW	Astrodynamics Support Workstation
AT	Along Track
AT-ACCA	Artificial Thermal Automated Cloud Cover Assessment
ATBD	Algorithm Theoretical Basis Document
ARCOR	Atmospheric and Topographic Correction
ATCS	Absolute Time Command Sequence
ATHom	Along-Track Homogeneity
ATK	Alliant Techsystems
ATL	Automated Tape Library
ATM	Asynchronous Transfer Mode
ATO	Authority to Operate
ATP	Authority to Proceed
ATRAN	Atmospheric Transmittance Layer
ATS	Absolute Time Sequence Automatic Transfer Switch
ATT	Authorization to Test
AU	Astronomical Units
AUI	Analyst User Interface
AVHRR	Advanced Very High Resolution Radiometer
AVI	Audio Video Interleave
AVIRIS	Airborne Visible / Infrared Imaging Spectrometer
AVPD	Avtec Programmable Demodulator
AVT	Algorithm Verification Test
AWESH	Automated Water Extent Shadow
AWG	Architecture Working Group
AWiFS	Advanced Wide-Field Sensor
AWM	Analytical Workspace Manager
AWS	Amazon Web Services

B&A	Billing & Accounting
B1	Build 1
B2B	Band-to-Band
B2BCal	Band-to-Band Calibration
BA	Billing and Accounting Burned Area
BAA	Broad Agency Announcement
BAC	Budget at Completion
BAD	Block Address Data
BAE	British Aerospace Engineering Company
BAI	Burned Area Index
BAER	Burned Area Emergency Response
BASIS+	Budget and Science Information System Plus
BBC	Blackbody Calibrator
BBFTP	Large File Transfer Protocol
BBOX	Bounding Box
BC	Best Case
BCD	Binary-Coded Decimal
BCH	Bose-Chaudhuri-Hocquenghem Error Detection and Correction
BCISO	Bureau Chief Information Security Officer
BCR	Baseline Change Request
BCWP	Budgeted Cost of Work Performed
BCWS	Budgeted Cost of Work Scheduled
BD	Band
BDA	Bulk Download Application
BDWA	Bulk Download Web Application
BER	Bit Error Rate
BERT	Bit Error Rate Test
BFP	Band First Probability
BG	Build Guide
BGF	Build GPR Files
BI	Bilinear Interpolation
BIA	Business Impact Analysis Business Impact Assessment Bureau of Indian Affairs
BIFF	Bad Interval File Fix
BIH	Bureau International de l'Heure
BIL	Band Interleaved by Line
BIMSTEC	Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation
BIP	Band Interleaved by Pixel
BIP2	Band Interleaved by Pixel Pair
BIS	Bureau of Industry and Security
BITSM	Bureau Information Technology Security Manager
BJC	Beijing, Peoples Republic of China Ground Station
BKT	Bangkok, Thailand Ground Station
BLM	Bureau of Land Management
bLMOC	Backup Landsat Multi-Satellite Operations Center
BME	Brouwer-Lyddane Mean Element
BMO	Business Management Office
BMOC	Backup Mission Operations Center
BMOE	Backup Mission Operations Element
BN	Background Noise
BNC	Bayonet Neill-Concelman
BOC	Budget Object Class
BOE	Basis of Estimate
BOM	Bill of Materials
BP	Bias Parameter Burn Probability
BPA	Blanket Purchase Agreement
BPAL	Best Practices Asset Library
BPDU	Bitstream Protocol Data Unit
BPF	Bias Parameter File
BPFAOS	BPF Automatic Ordering System
BPG	Bias Parameter Generator
bps	Bits per Second
BPSK	Biphase Shift Keying
BQA	Quality Assessment Band
BRAA	Band Registration Accuracy Assessment
BRAT	Bit Rot Assessment Tool
BRDF	Bidirectional Reflectance Distribution Function
BRDF-n	Normalized Bidirectional Reflectance Distribution Function
BRDF-s	Spectral Bidirectional Reflectance Distribution Function
BRF	Bidirectional Reflectance Factor
BRIDGE	Big Reprocessing Initiative Data Gap Environment
BRTS	Bilateration Ranging Transponder System
BSP	Best Security Practices
BSQ	Band Sequential
BSSC	Bit Synchronizer / Signal Conditioner
BSTAR	Drag-Related Parameter in the NORAD Two-Line Element
BSU	Baseband Switching Unit
BT	Brightness Temperature
BTC	Bench Test Cooler
BTF	Ball Test Facility
BTI	Blank Tape Interface
BTL	Boot Loader
BUI	Bumper mode User Interface
BUTST	Bureau Unix Technical Support Team
BVR	Boast Voltage Regulator
BWTST	Bureau Windows Technical Support Team

C	Centigrade
C&A	Certification and Accreditation
C&DH	Command and Data Handling
C&T	Command and Telemetry
C&T DB	Command and Telemetry Database
C0	Coefficient 0
C1	Coefficient 1 Collection 1
C1L1	Collection 1 Level 1
C1L1RT	Collection 1 Level 1 Real Time
C1L2	Collection 1 Level 2
C1L2Alb	Collection 1 Level 2 Albers
C2	Coefficient 2 or Collection 2
C2L1	Collection 2 Level 1
C2L1RT	Collection 2 Level 1 Real Time
C2L2	Collection 2 Level 2
C2L2Alb	Collection 2 Level 2 Albers
C3S	NPOESS Command, Control, and Communications Segment
C_a	Chlorophyll-a
CA	Conjunction Assessment Control Account Cost Account Coatal Aerosol
CAB	Change Advisory Board
CADU	Channel Access Data Unit
CAGE	Commercial and Government Entity
CAL	Calibration Data
Cal/Val	Calibration/Validation
CALCON	Characterization and Radiometric Calibration for Remote Sensing Annual Meeting
CalCR	Calibration Collection Request
CalManWG	Calibration Maneuver Working Group
CALTest	Calibration/Validation Test
CAM	Control Account Manager Command Authorization Meeting Communications Security Account Manager
CAMEL	Combined ASTER MODIS Emissivity over Land
CAOS	Collection Automatic Ordering System
CAP	Cartridge Access Port Control Account Plan
CAPE	Collection Activity Planning Element
CAPERD	CAPE Requirements Document
CARA	Conjunction Assessment Risk Analysis
CARD	Constraints and Restrictions Document
CARD4L	CEOS ARD for Land
CASA	Cloud and Cloud Shadow Assessment
CaTT	Command and Telemetry Transceiver
CA-WAD	Cost Account Work Authorization Document
CBA	Cost-Benefit Analysis
CBB	Contract Budget Base
CBC	Cipher Block Chaining
CBERS	China-Brazil Earth Resources Satellite
CBG	Configuration and Build Guide
CBLCM	Chesapeake Bay Land Change Model
CBN	Cuiaba [Brazil] Earth Station
CBS	Commission for Basic Systems
CC	Cubic Convolution Computer Compatible Tape Cloud Cover
CCA	Cloud Cover Assessment Clinger-Cohen Act
C-CAP	Coastal Change Analysis Program
CCB	Configuration Control Board
CCD	Charge-Coupled Device Continuous Change Detection
CCDC	Continuous Change Detection and Classification
CCE	Cryocooler Electronics
CCI	Controlled Cryptographic Item
CCL	Commerce Control List
CCM	Cloud Cover Manager
CCMC	Community Coordinated Modeling Center
CCMS	Combined Cache Management Subsystem
CCOH	Cost Center Overhead
CCP	Configuration Change Process Contamination Control Process Cloud Cover Prediction
CCR	Configuration Change Request
CCRS	Canada Center for Remote Sensing
CCS	COI Cleanup System Confirmed Contact Schedule Constellation Coordination System
CCSDS	Consultative Committee for Space Data Systems
CCT	Computer Compatible Tape Credit Card Transaction
CCU	Charge Control Unit
CD	Change Directory Compact Disk Cooler Door
CDB	Centralized Database
CDBS	Centralized Database System
CDE	Common Desktop Environment
CDED	Canadian Digital Elevation Dataset
CDEM	Canadian Digital Elevation Model
CDH	Command and Data Handling
CDI	Capture Device Identifier
CDIST	Distance to Cloud
CDL	Cropland Data Layer
CDLR	Command Data Loss Report
CDM	Conjunction Data Message
CDMS	Carrier Doppler Measurement System
CDN	Content Delivery Network
CDR	Critical Design Review Calibration Data Record Climate Data Records
CDRL	Contract Data Requirements List Command Data Loss Report
CD-ROM	Compact Disk-Read Only Memory
CDS	Coded Data Segment Comprehensive Discrepancy System
CDT	Central Daylight Time CPF Distribution Tool
CE	Circular Error Cognizant Employee
CE90	Circular Error 90
CEC	Cation Exchange Capacity
CED	Confirmed Event Details
CentOS	Community Enterprise Operating System
CEOS	Committee on Earth Observation Satellites
CER	Cost Estimating Relationship
CERR	Critical Event Readiness Review
CERT	Community Emergency Response Team
CES	Cost Element Structure
CF	Correction Factor Cloud Fraction Cloud Formation
CFC	Contact Forecast Confirmation Cloud Fraction Climatology
CFDP	CCSDS File Delivery Protocol
CFL	Conflict Notice
CFMask	C version of Fmask
CFP	Cold Focal Plane
CFPA	Cold Focal Plane Array Cold Focal Plane Assembly
CFR	Code of Federal Regulations Contact Forecast Request
CFT	Cloud Formation Template
CGB	Calculated Gains and Biases
CGI	Common Gateway Interface
CGMS	Coordination Group for Meteorological Satellites
CGSe	CuGaSe2
CHIME	Copernicus Hyperspectral Imaging Mission for the Environment
CHS	Cloud Hosting Solutions
CI	Configuration Item Continuous Integration
CI/CD or CICD	Continuous Integration / Continuous Deployment
CIA	Confidentiality, Integrity, and Availability
CIB	Controlled Image Base
CIC	Computer Interrupt Code
CIDR	Classless Inter-Domain Routing CRSSP Imagery Derived Requirements
CIFS	Common Internet File System
CIIL	Configuration Item Identifier List
CIL	Critical Items List
CIO	Chief Information Officer
CIRC	Computer Incident Reporting Center Compact Infrared Camera
CIS	Center for Information Security
CISO	Chief Information Security Officer
CISSP	Certified Information Systems Security Professional
CITT	Center Information Technology Team
CIU	Controls Interface Unit
CLASS	NOAA Comprehensive Large Array-data Stewardship System
CLCW	Command Link Control Word
CLI	Command Line Interface
CLOB	Character Large Object
CLR	Combined Labor Rate Contractor Labor Rate
CLTU	Command Link Transmission Unit
CLU	Climate and Land Use
cm	Centimeter
CM	Configuration Management Center of Mass
CMA	Climate Modeling Grid - Aerosol Chinese Meteorological Administration
CMB	Change Management Board
CMC	Center Management Council
CMD	Command
CME	Coronal Mass Ejection
CMG	Climate Modeling Grid
CMIP	Cloud and Moisture Imagery Product
CMIPC	Cloud and Moisture Imagery Product CONUS
CMIPF	Cloud and Moisture Imagery Product Full Disk
CMIX	Cloud Masking Intercomparison eXercise
CMM	Capability Maturity Model
CMMI	Capability Maturity Model Integration
CMO	Configuration Management Office
CMOS	Complementary Metal Oxide Semiconductor
CMP	Configuration Management Plan Change Management Plan
CMS	Content Management System Code Sync Marker
CN	Coherent Noise
CND	Could-Not-Duplicate
CNES	Centre National d’Etudes Spatiales
CNN	Convolutional Neural Network
CNNS	Committee on National Security Service
CNR	Carrier-to-Noise Ratio
CO	Contract Officer Content Owner
COA	Cordoba, Argentina Ground Station Change of Allocation
COAC	Captured Opportunity Assessment Code
COAST	Development of Coastal Study Team
COC	Certificate of Completion Cost of Consequence
COFUR	Cost of Fulfilling a User Request
COG	Center of GravityContinuity of Government Cloud Optimized GeoTIFF
CoGenT	Combination Generation Tool
COI	Common Order Interface Calibration/Validation Order Interface
COIGUI	Common Order Interface Graphical User Interface
COLA	Collision Avoidance
COMM	Communications Subsystem
COMSEC	Communications Security
Con Ops	Concept of Operations
CONAE	Commission Nacional De Actividades Espaciales
CoNED	Coastal National Elevation Database
CONUS	Continental United States Conterminous United States
COOP	Continuity of Operations
COP	Contingency Operating Procedure
COR	Contracting Officer Representative Cost of Reproduction
CORS	Cross-Origin Resource Sharing
COS	Cosine
COST	Calibration Operations Scheduling Tool
COTR	Contracting Officer’s Technical Representative
COTS	Commercial Off-The-Shelf
COUA	Certified Organizational Unit Administrator
CP	Calibration Parameter or Change Proposal
CPAF	Cost Plus Award Fee
CPAW	Collection Planning and Analysis Workstation
CPC	Contingency Plan Coordinator
CPCI	Compact Peripheral Component Interconnect
CPEI	Computer Program End Items
CPEX-CV	Convective Processes Experiment – Cabo Verde
CPF	Calibration Parameter File
CPFF	Cost Plus Fixed Fee
CPI	Cost Performance Index
CPIC	Capital Planning and Investment Control
CPM	Critical Path Methodology
CPO	Custodial Property Officer
CPR	Cost Performance Report
CPR1	Cost Performance Report 1
CPR4	Cost Performance Report 4
CPR5	Cost Performance Report 5
CPS	Calibration Parameter Management and Testing Subsystem
CPT	Comprehensive Performance Test
CPU	Central Processing Unit
CR	Central Repository Controlled Repository Change Request Contingency Reserve Carriage Return Confirmation Review Command Routing
CR1	Computer Room 1
CR1MSS	Computer Room 1 Mass Storage System
CR2	Computer Room 2
CR2IT	Centralized Repository 2 Integration and Test
CR2OPS	Centralized Repository 2 Operations
CR2ST	Centralized Repository 2 System Test
CR3	Computer Room 3
CRADA	Cooperative Research and Development Agreement
CRaM	Combined Radiometric Model
CRESDA	China Center for Resources Satellite Data and Applications
CRC	Cyclic Redundancy Check Cyclic Redundancy Code
CRDEV	Central Repository Development
CRI	Collection Request Interface
CRIT	Central Repository Integration and Test
CRM	Customer Relationship Management Continuous Risk Management
CRMP	Continuous Risk Management Plan
CRMT	Contingency Response Management Team
CRN	Climate Reference Network
CROPS	Central Repository Operations
CRS	CDF Retrieval Subsystem
CRSSGS	China Remote Sensing Satellite Ground Station
CRSSP	Commercial Remote Sensing Space Policy
CRST	Central Repository System Test
CRT	Command, Ranging and Telemetry
CRTEST	Central Repository Test
CRV	Combined Reference Value
CS	Customer Service Coordinate System
CSA	Configuration Status Accounting Commissioning Support Area Canadian Space Agency
CSAM	Cybersecurity Assessment Management
CSC	Computer Software Component
CSCI	Computer Software Configuration Item
CSDA	Commercial Smallsat Data Acquisition Program
CSDGM	Content Standard for Digital Geospatial Metadata
CSI	Container Storage Interface
CSIRT	Computer Security Incident Report Team
CSIRO	Commonwealth Scientific and Industrial Research Organization
CSIS	Control and Schedule Interface System
CSIR	Council for Scientific and Industrial Research
CSM	Code Sync Marker
CSMO	Chief Safety and Mission Assurance Officer
CSO	Communication Services Office Chief Safety and Mission Assurance Officer
CSOP	COMSEC Standard Operating Procedure
CSP	COMSEC Security Plan Cloud Service Provider
CSR	Capture Success Rate Capture Success Ratio Customer Service Representative Change System Request
CSRM	CHS Cloud Shared Responsibility Model
CSS	Cascading Style Sheet Central Security Service Core Science Systems Course Sun Sensor
CSU	Computer Software Units
CSV	Comma Separated Values
CT	Connectivity Test
CTB	Command and Telemetry Board
CTDiff	Cross-Track Difference
CTE	Calibration Test Equipment Compatibility Test Equipment Common Table Expression
CTHome	Cross-Track Homogeneity
CTP	Command and Telemetry Processors
CTS	Capture Transfer Subsystem Capture Transfer System
CTV	Compatibility Test Van
CUB	Cuiaba, Brazil Ground Station
CUI	CPF User Interface Controlled Unclassified Information
CV	Command Verification Cost Variance Coefficient of Variation
CV-5	Calibration and Validation 5
CV-7	Calibration and Validation 7
CVCDU	Coded Virtual Channel Data Unit
CVCM	Collected Volatile Condensable Material Collected Volatile Condensable Mass
CVDQA	Calibration Validation Data Quality Assurance
CVE	Calibration Validation Element
CVS	Concurrent Versions System
CVT	Calibration and Validation Team
CVTK	Calibration / Validation Toolkit
CVTKRD	Calibration and Validation Toolkit Requirements Document
CVWG	Calibration-Validation Working Group
CW	Continuous Wave Amazon Cloud Watch
CWL	Center Wavelength
CY	Contract Year
CyAN	Cyanobacteria Assessment Network

D&M	Development and Maintenance
D/C	Down Converter
D/L	Downlink
D1R	DMS Generate L1R
D3	50GB Data tape cartridge from StorageTek
DA	Document Administrator Document Amendment
DAAC	Distributed Active Archive Center
DaaS	Desktop as a Service
DACA	Days After Contract Award
DAE	Data Acquisition Element
DAF	Data Acquisition Facility
DAG	Database Administrator Guide Directed Acyclic Graph
DAM	Data Acquisition Manager Database for Analysis and Modeling
DAP	Data Acquisition Plan Data Acquisition Planner Digital Analytics Program
DAR	Data at Rest, Data Acquisition Request, Decision Analysis and Resolution
DART	Data Access Restriction Tool Decision Analysis and Resolution
DAS	Data and Applications Support
DASB	Direct Access S-Band
DAT	Data Access Tool
DAU	Defense Acquisition University
DB	Database or Data Block
dB	Decibel
dB/K	Decibel per Degree Kelvin
DBA	Database Administrator
DBaaS	Database as a Service
DBAR	Database Access Routines
DBCA	Database Configuration Assistant
DBCI	Database Configuration Item
DBDD	Database Design Description Database Description Document
dB-Hz	Decibel-Hertz
dBi	Decibel Above Isotropic
DBI	Database Interface
DBMS	Database Management System
DBS	Data Services Branch
dBW	Decibel Relative to 1 Watt
DC	Direct Current
DC&P	Data Capture and Processing Facility
DCAA	Defense Contract Audit Agency
DCC	Data Characterization Components Deep Convective Clouds
DCCB	DHF Configuration Control Board Development Configuration Control Board
DCE	Data Collection Event
DCG	DMS Generate Custom GCPLib
DCIM	Data Center Infrastructure Management
DCN	Document Control Number Document Change Notice
DCO	DMS Capture Order
DCOI	Data Center Optimization Initiative
DCP	Data Collection Planners Data Processing Components
DCPF	Data Capture & Processing Facility
DCR	Document Change Request
DCRS	Data Collection and Routing Subsystem Data Collection and Routing System
DCRSf	Data Collection and Routing Subsystem file router Data Collection and Routing System file router
DCRSi	Data Collection and Routing Subsystem interval router Digital Cassette Recorder System Incremental
DCRSUI	Data Collection and Routing Subsystem User Interface
DCS	Data Capture System or Data Characterization Subsystem Destination Control Statement Distributed Cache Service Data Center and Systems
DCT	Digital Cassette Tape
DCW	Data Collection Workbook
DDD	Displacement Damage Dose
DDI	DCS Data Ingest
DDL	Database Definition Language
DDOS	Distributed Denial of Service
DDR	Data Descriptor Record
DDRC	DPAS Design Reference Case
DDS	DCS Database Server Database Distribution Subsystem Data Distribution Service
DDT	DPAS Test Team
DDV	Dense Dark Vegetation
DE	Definitive Ephemeris
DEF	Definitive Ephemeris Product
Delta-I	Delta-Inclination
DEM	Digital Elevation Model
DEMIX	Digital Elevation Model Intercomparison eXperiment
DEPEPH	Definitive Ephemeris Product
DES	Station Description Message DAAC Emergency System
DESIS	DLR Earth Sensing Imaging Spectrometer
DET	Escape Detection
DEU	Digital Electronic Unit
DEV	Development
DF	Diffuser Type
DFCB	Data Format Control Book
DFD	Data Flow Diagram
DFP	DMS Format and Package
DFT	DMS File Transfer
DG	Digital Globe
DGC	DMS Generate Custom GCPs
DGGS	Discrete Global Grid System
DGR	DMS Generate Report Statistics
DGT	DMS Generate Thumbnail
DHCP	Dynamic Host Configuration Protocol
DHF	Data Handling Facility
DHN	Data Handling Node
DHS	Department of Homeland Security
DI	Dependency Injection
DIAB	DPS-in-a-Box
DIAR	Department of the Interior Acquisition Regulation
DIAT	Daily Image Annotation Tape
DID	Data Item Description or DMS Ingest L0R Data
DIE	DMS Ingest Element
DIR	Direction
DIRSIG	Digital Imaging and Remote Sensing Image Generation
DIRT	Data Interception by Remote Transmission
DIS	Data Information System Data Instrumentation System
DISC	Data and Information Services Center
DITL	Day-In-The-Life
DIV	Data Integrity Validation
DKI	Parepare, Indonesia Ground Station
DLC	DMS Load Characterization from Cloud
DLI	DMS Load Inventory from Cloud
DLR	Deutsches Zentrum für Luft- und Raumfahrt (German Aerospace Center)
DLT	Digital Linear Tape
DM	Data Management Document Management Data Manager
DMA	Direct Memory Access Defense Mapping Agency
DMAPI	Data Manager Application Programmer Interface
DMB	Data Management Branch Data Management Baseline
DMD	Digital Micromirror Device
DME	Development, Modernization, and Enhancement
DMF	Data Migration Facility
DMI	DCRS to MOE Interface
DMID	Data Management and Information Delivery
DML	Data Manipulation Language
DMLMDB	Data Management Landsat Metrics Database
DMP	Document Management Plan Data Management Policy Data Management Plan
DMR	Detailed Mission Requirements
DMS	Data Management Subsystem Degrees, Minutes, Seconds Database Migration Service
DMSP	Defense Meteorological Satellite Program
DMU	Data Migration Utility Drag Makeup
DMUI	Data Management User Interface
DMV	Detector Map Verification
DMZ	Demilitarized Zone
DN	Descending Node Digital Number
DNH	Do No Harm
DNS	Domain Name Server Domain Name System
DO	Delivery Order Director's Office
DOC	Department of Commerce
DoD	Department of Defense Depth of Discharge
DOI	Department of the Interior Digital Object Identifier
DOJ	Department of Justice
DOORS	Dynamic Object-Oriented Requirements System
DOORS-NG	Dynamic Object-Oriented Requirements Management System Next Generation
DOP	Dilution of Precision
DOQ	Digital Orthophoto Quadrangle
DORRAN	Distributed Ordering, Research, Reporting, and Accounting Network
DoS	Denial of Service
DOS	Department of State
DOWD	Differenced One-Way Doppler
DOY	Day-of-Year
DP	Data Processing
DPA	Destructive Physical Analysis
DPAS	Data Processing and Archive System
DPASRD	Data Processing and Archive System Requirements Document
DPC	Data Processing Components
DPD	DMS Placement Daemon
DPL	DMS Process L0R
DPMC	Directorate Program Management Council
DPP	DMS Packet and Placement
DPR	DMS Process ROLO Report
DPS	Data Processing Subsystem Data Processing System
DQA	Data Quality Analyst
DQV	Data Quality Validation
DR	Delivery Record or Discrepancy Report Disaster Recovery or Design Review
DRA	DMS Retrieve Ancillary
DRAC	Dell Remote Access Controller
DRAD	Downwelled Radiance Layer
DRB	Discrepancy Review Board
DRC	Data Requirements List Design Reference Case
DRC-16	16-day Design Reference Case
DRD	Dated Raw Data
DRE	DMS Retrieve Elevation
DRFP	Draft Request for Proposal
DRM	DMS Resource Manager
DRP	Disaster Recovery Plan
DRS	Data Reduction System
DRSF	Daily Request Status File
DRTS	Data Reporting and Tracking Subsystem
DSB	Data Service Branch
DSC	Descent Maneuver
DSI	DMS Subsetter Interface
DSL	Days-Since-Launch
DSM	Digital Surface Model
DSN	Deep Space Network
DSP	Digital Signal Processor
DSS	Data Staging System DPAS Subsetter
DST	Data Support Team
Dst	Disturbance Storm Time
DSW	DMS Setup Work Order
DSWE	Dynamic Surface Water Extent
dT	Difference between hot and cold temperatures
DT	Diffuser Type
DTED	Digital Terrain Elevation Data
DTG	Daytime Group
DTO	Data Transfer Object
DTR	Document Transfer Request
DTS	Development and Training Simulations
DTT	DPAS Test Team
DUI	Data Manager User Interface DMS Universal L0R Ingest
DUNS	Data Universal Numbering System
DUZ	DMS UTM Zone
DV	Data Validation
DV&E	Data Validation & Exchange
DVD	Digital Versatile Disc
DVD-R	Digital Versatile Disc – Read Only
DWF	Design Web Format
DXL	DMS L0 and L1 Products

E&A	Evaluation and Analysis
E&IT	Engineering and Information Technology
E-Government	Electronic Government
e-WAD	Employee Work Authorization Document
E2E	End-to-End
EA	Enterprise Architecture Executive Agency
EAC	Estimate at Completion
eAD	Enterprise Active Directory
EAR	Export Administration Regulations
EarthMAP	Earth Monitoring, Analyses, and Projections
EAS	Evaluation and Analysis Subsystem
EASI	Enterprise Architecture Study Implementation
EAST	EROS Architecture Study Team
Eb	Energy per Bit
Eb/N0	Energy per Bit to Noise
EBAS	EROS Billing and Accounting System
EBS	Elastic Block Store
EC	Electronic Copy European Commission
EC2	Amazon Elastic Compute Cloud
ECA	Earth Coverage Antenna
ECC	Error Correction Code Embedded Controller Card
ECCC	Environment and Climate Change Canada
ECCOE	EROS Calibration / Validation Center of Excellence
ECEF	Earth-Centered, Earth-Fixed
ECF	Earth Centered Fixed
ECHO	Extraction and Classification of Homogeneous Objects EOS Clearinghouse
ECI	Earth Centered Inertial
ECIMOD	ECI Mean of Date
ECITOD	Earth Centered Inertial TRUE of Date
ECL	Emitter-Coupled Logic
ECM	EROS Cloud Management
ECMP	EROS Contingency Plan Management
ECMWF	European Centre for Medium-Range Weather Forecasts
ECOSTRESS	Ecosystem Spaceborne Thermal Radiometer Experiment on Space Station
eCPIC	Electronic Capital Planning and Investment Control
ECR	Earth Centered Rotating Amazon Elastic Container Registry
ECS	EOSDIS Core System Amazon Elastic Container Service
ECU	End Cryptographic Unit
ECV	Essential Climate Variable
EDAC	Error Detection and Correction
EDAP	Earthnet Data Assessment Pilot
eDAR	Enterprise Data At Rest
EDC	EROS Data Center
EDDDR	EDC Daily Discrepancy Report EDC Daily Data Received Report
EDDN	Emergency Data Distribution Network
EDG	EOS Data Gateway
EDOS	EOS Data Processing Segment EOS Data and Operations System
EDU	Engineering Development Unit
EE	EarthExplorer Edge Extent
EELV	Evolved Expendable Launch Vehicle
EEE	Electrical, Electronic, Electromechanical
EEF	Enterprise Environmental Factors
EEMT	EROS Executive Management
EEO	Equal Employment Opportunity
EEPROM	Electrical Erasable Program Read-Only Memory
EETT	Ecosystem Extent Task Team
EF	Earth-Fixed
EFS	Encrypting File System Elastic File System EELV Secondary Payload Adapter Flight System
EGS	Enterprise Ground System
EGSE	Electrical Ground Support Equipment
EIA	Electronic Industry Alliance
EIRP	Effective Isotropic Radiated Power
EIS	External Interface Specification
EISER	EROS Information System Event Response
EJB	Enterprise Java Beans
EKMS	Electronic Key Management System
EKS	Amazon Elastic Kubernetes Service
EL1PS	EDC Level 1 Prototype System
ELT	Encumbrances, Leans, and Threats
ELV	Expendable Launch Vehicle
ELVIS	EROS LiDAR Visualization
EM	Engineering Model
email	Electronic Mail
EMC	Electromagnetic Compatibility
EMD	Enhanced Metadata
EMI	Electromagnetic Interference
EMIS	Emissivity Layer
EMP	Electromagnetic Pulse
EMSD	Emissivity Standard Deviation
EMV	Expected Monetary Value
EN	EarthNow!
EnMAP	Environmental Mapping and Analysis Program
ENVI	Environment for Visualizing Images
EO	Earth Observing
EO-1	Earth Observing 1
EOA	Earth Observation Assessment
EOC	Earth Observation Center
EOCL	Electro-Optical Commercial Layer
EODMS	Earth Observation Data Management System
EOF	End-of-File
EOIS	Earth Observation Data & Information Systems
EOL	End-of-Line End-of-Life
EOM	End-of-Mission
EOMP	End-of-Mission Plan
EOP	Executive Office of the President
EOR	Earth Observation Requirements
EORES	Earth Observation Requirements Evaluation System
EOS	Earth Observing System
EOSAT	Earth Observation Satellite Company
EOSDIS	EOS Data and Information System
EPA	Euler Parameter ESD Protected Area
EPICS	Extended Pseudo-Invariant Calibration Sites
EPF	ETM+ Processing Facility
EPGN	EOS Polar Ground station Network
EPP	Electronic Power Converter for Payload
EPR	Engineering Peer Review
EPRP	Engineering Peer Review Plan
EPS	Electrical Power Subsystem
EPSG	European Petroleum Survey Group
ERB	Engineering Review Board
ERD	Entity Relationship Diagram
EROS	Earth Resources Observation and Science
EROS-ISP	EROS-Imaging Spectroscopy Project
ERPS	EOS Real-time Processing System
ERR	Error
ERS	EROS Registration Service
ERTS	Earth Resources Technology Satellite
ERMM	Emergency Risk Mitigation Maneuver
ES	Edge Slope
ESA	European Space Agency Earth Sensor Assembly
eSAS	Enterprise Security Applications Service
ESB	Enterprise Service Bus
ESCAP	Economic and Social Commission for Asia and the Pacific
ESD	Earth Science Division Electrostatic Discharge
ESDIS	Earth Science Data and Information System
ESDS	Earth Science Data Systems
ESF	Edge Spread Function
ESIP	Earth Science Information Partners
ESM	Equipment Support Module
ESMO	Earth Science Mission Operations
ESN	Enterprise Services Network
ESP	Encapsulating Security Payload Engineering Specialty Plans
ESPA	EROS Science Processing Architecture EELV Secondary Payload Adapter
ESTO	Earth Science Technology Office
ESRB	Elevation Specification Review Board
ESRI	Environmental Systems Research Institute
ESRIN	European Space Research Institute
ESSO	Earth Systems Science Organization
ESUN	Solar Spectral Irradiance Exoatmospheric Spectral Irradiances
ET	Evapotranspiration
ETa	Actual Evapotranspiration
ETC	Estimate to Completion
ETE	End to End
ETf	Evapotranspiration Fraction
ETL	Extraction, Translation, Load Extract, Transform, Load
ETM	Enhanced Thematic Mapper
ETM+	Enhanced Thematic Mapper Plus
ETMDSS	Enhanced Thematic Mapper Plus Data Subsetting Subsystem
ETOPO5	Earth Topography Five Minute Grid
ETr	Evapotranspiration Alfalfa-Reference Potential
ETRO	Estimated Time of Return to Operations
ETUN	Evapotranspiration Uncertainty
ETV	Expected Time Value
EU	Engineering Unit
EUG	EROS User Group
EUMETSAT	European Organization for the Exploitation of Meteorological Satellites
EV	Earned Value
EVA	Enhanced Visualization and Analysis Tool
EVCDU	Extended Virtual Channel Data Unit
EVI	Enhanced Vegetation Index
EVM	Earned Value Management
EVMS	Earned Value Management System
EVP	Environmental Verification Plan
EVS	Earth-Vehicle-Sun angle Earned Value System
EVT	Enhanced Value Technique Existing Vegetation Type
EWR	Eastern and Western Ranges
EWW	Extended Workweek
ExPAC	Extended PICS Absolute Calibration

F&PS	Functional and Performance Specifications
FA	Formulation Authorization
FAB	File Allocation Block
FAC	Full Aperture Calibrator
FAD	Formulation Authorization Document
FAI	Federal Acquisition Institute
FANO	Forcing and Normalizing Operation
FAQ	Frequently Asked Question
FAR	Federal Acquisition Regulation
FASC	Full Aperture Solar Calibrator
FASCAL	Facility for Spectroradiometric Calibrations
FAST-L7A	FAST-Landsat 7 Format
FAT	Factory Acceptance Testing
FAX	Facsimile Transmission
FBI	Federal Bureau of Investigation
FBMS	Financial and Business Management System
FBU	Fixed Base Unit
FC	Formulation Contractor Fiber Channel or Fractional Cover
FC-AL	Fiber Channel-Arbitrated Loop
FCA	Functional Configuration Audit
FCDAS	Fairbanks Command and Data Acquisition Station
FD	Flight Dynamics or Fire Detection
FDAB	Flight Dynamics Analysis Branch
FDAC	Failure Detection and Control
FDC	Failure Detection and Correction
FDD	Facilities Definition Document Format Description Document
FDDI	Fiber-Distributed Data Interface
FDF	Flight Dynamics Facility
FDIR	Fault Detection, Isolation, & Recovery
FDS	Flight Dynamics System
FDW	Foreign Data Wrapper
FEC	Forward Error Corrected
FedRAMP	Federal Risk and Authentication Management Program
FEDS	Front-End Data System
FEMA	Federal Emergency Management Agency
FEP	Front-End Processor
FFOV	Full Field of View
FFP	Firm Fixed Price
FFRDC	Federally Funded Research and Development Centers
FFS	Fiscal Financial System
FFT	Fast Fourier Transform
FFTW	Fastest Fourier Transform in the West
FGDC	Federal Geographic Data Committee
FHS	First Half Scan
FHSERR	First Half Scan Error
FIA	Final Implementation Agreement
FIEOS	Future Intelligent Earth Observing Satellites
FIFO	First In, First Out
FIPS	Federal Information Processing Standards
FIR	Finite Impulse Response
FISCAM	Federal Information System Control Audit Manual
FISMA	Federal Information Security Management Act
FISSA	Federal Information System Security Awareness
FITARA	Federal Information Technology Acquisition Reform Act
FLIR	Forward-Looking Infrared
FM	Fault Management
Fmask	Function of Mask
FMEA	Failure Mode and Effect Analysis
FMECA	Failure Modes, Effects, and Criticality Analysis
FMFIA	Federal Manager’s Financial Integrity Act
FMT	Format
FNMOC	Fleet Numerical Meteorology and Oceanography Center
FOC	Full Operational Capability
FOCCB	Flight Operations Configuration Control Board
FOIA	Freedom of Information Act
FOM	Facilities Operations Manager
FOP	Flight Operations Plan
FOR	Flight Operations Review
FORE-SCE	FOREcasting SCEnarios
FORMATS	Flight Dynamics Orbit and Mission Aids Transformation System
FOS	Flight Operations Segment
FOT	Flight Operations Team
FOTS	Free Off-The-Shelf
FOV	Field of View
FP	Flight Processor
FPA	Focal Plane Assembly Focal Plane Array
FPD	Flight Projects Directorate
FPE	Focal Plane Electronics
FPGA	Field-Programmable Gate Array
FP-IT	Forward Processing for Instrument Teams
FPM	Focal Plane Modules
FPPS	Federal Personnel Payroll System
FPROC	Forward Processing
FQT	Formal Qualification Testing Functional Qualification Test
FRB	Full-Resolution Browse Failure Review Board
FRED	Framed Raw Expanded Data
FRP	Federal Response Plan
FRPOC	Forward Processing
FRR	Flight Readiness Review
FRS	File Retrieval System
FS	Forecast Schedules
fSCA	Fractional Snow Covered Area
FSCC	Fastcom Serial Card
FSD	Flight Systems Development
FSL	Flight System Lead Flight Support Lead
FSM	Flight Systems Manager
FSP	Fundamental Science Practices
FSSC	Financial Support Services Contract
FST	Flight Support Team
FSTL	FST Lead
FSV	Flight Software Vendor
FSW	Flight Software
FTA	Fault Tree Analysis
FTD	File Transfer Daemon
FTE	Full-Time Equivalent Full-Time Employee
FTP	File Transfer Protocol
FTR	Forced to Rebalance
FTS	Flight Termination System
FUSE	Filesystem in USErspace
FW	Firewall Full Width
FWHM	Full Width Half Maximum
FWS	Fish and Wildlife Service
FY	Fiscal Year

G&A	General and Administrative
G/T	Gain over Temperature
GA	Geoscience Australia
GAfG	Google Apps for Government
GAM	Geography Analysis and Monitoring
GAN	Generative Adversarial Network
GAO	General Accounting Office
GAQD	Originator Routing Code for IIRV Messages
GAR	Global Archive Refresh
GARD	Global Analysis Ready Data
GASSpy	Geometry Assessment Python Implementation
GAST	Greenwich Apparent Sidereal Time
GB	Gigabyte
GbE	Gigabit per Second Ethernet
GBFOM	Global Band Figure of Merit
GBICS	Gigabit Interface Converters
GBL	Government Bill of Lading
Gbps	Gigabits per Second
GBRM	Gradient Booted Regression Model
GCCB	Ground Segment Configuration Control Board
GCDR	Ground System Critical Design Review
GCOR	Temperature Corrected Gains
GCOS	Global Climate Observing System
GCP	Ground Control Point
GCRS	Geocentric Celestial Reference System
GCTP	General Cartographic Transformation Package
GDAIS	General Dynamics Advanced Information Systems
GDAL	Geospatial Data Abstraction Library
GDP	Gross Domestic Product
GDS	Ground Data Systems
GECSC	Geosciences and Environmental Change Science Center
GED	Global Emissivity Database
GEDU	Ground Encryption / Decryption Unit
GEE	Google Earth Engine
GEMI	Global Environmental Monitoring Index
GEO	Geolocation Index File Group on Earth Observations
GEOGLAM	Group on Earth Observations Global Agricultural Monitoring
GEOID	Gravity for Earth, Ocean, and Ice Dynamics
GeoJSON	Geographic JavaScript Object Notation
GEOM	Geometric
GeoRSS	Geographic Really Simple Syndication
GEOS-5 FP-IT	Goddard Earth Observing System Model, Version 5 Forward Processing for Instrument Teams
GEOS-R	Geostationary Operational Environmental Satellite-R Series
GEOSS	Global Earth Observation System of Systems
GeoTIFF	Geographic Tagged Image File Format Georeferenced Tagged Image File Format
GES DISC	Goddard Earth Sciences Data and Information Services Center
GEVS	General Environmental Verification Specification
GFE	Government Furnished Equipment
GFI	Government Furnished Information
GFOI	Global Forest Observations Initiative
GFP	Government Furnished Property
GFS	Global File System
GFY	Government Fiscal Year
GGOS	Global Geodetic Observing System
GHG	Greenhouse Gas
GHz	Gigahertz
GIA	Government Inspection Agency
GIAC	Global Information Assurance Certification
GIAM	Global Irrigated Area Mapping
GIDEP	Government Industry Data Exchange Program
GIFOV	Ground-projected Instantaneous Field of View
GigE	Gigabit Ethernet
GIMP	Greenland Ice Mapping Project
GIO	Geographic Information Officer
GIPS	Geoinformatics Products and Solutions
GIQE	General Image-Quality Equation
GIS	Geographical Information Systems Geographic Information System
GISRA	Government Information Security Reform Act
GISTDA	Geoinformatics and Space Technology Development Agency (Thailand)
GL	Geoscience Laboratory
GLAMR	Goddard Laser for Absolute Measurement of Radiance
GLanCE	Global Land Cover mapping and Estimation
GLC	Ground Look Calibration Request or Gilmore Creek
GLCC	Global Land Cover Characterization
GLCUC	Global Land Cover, land Use, and land cover Change
GloVis	Global Visualization Viewer
GLS	Global Land Survey or Global File System
GMAO	Global Modeling and Assimilation Office
GMAP	Global Monitoring Acquisition Plan
GMRCA	Global Map of Rainfed Cropland Areas
GMSEC	Goddard Mission Services Evolution Center
GMSR	Government Monthly Status Review
GMT	Greenwich Mean Time
GN	Ground Network
GNC	Gatineau, Canada Ground Station
GNE	Ground Network Element
GNE-DCRS	Ground Network Element Data Collection and Routing System
GNEDD	Ground Network Element Design Document
GNEOCD	Ground Network Element Operations Concept Document
GNERD	GNE Requirements Document
GNSS	Global Navigation Satellite System
GNU	GNU’s Not Unix
GOES	Geostationary Operational Environmental Satellite
GOLD	Goddard Open Learning Design
GOOS	Global Ocean Observing System
GOP	Ground Operations Plan
GOS	Geospatial One-Stop
GOT	Ground Operations Team
GOTS	Government Off-The-Shelf
GP	Geophysical Parameter
GP4	General Perturbation Theory
GPART	Geophysical Parameter Tool Geophysical Parameter Assignment Rating Tool
GPCS	General Processing and Control System
GPD	GSFC Policy Directive
GPDR	Ground System Preliminary Design Review
GPL	General Public License
GPR	GNE Post-Pass Report Goddard Procedural Requirement
GPRA	Government Performance and Results Act
GPS	Geometric Processing System Gap Phase Statistic Global Positioning System
GPSR	Global Positioning System Receiver
GRACE	Gravity Recovery and Climate Experiment
GRASS	Geographic Resources Analysis Support System
GRI	Ground Reference Image
GRIB	Gridded Data or Gridded Binary
GRID	Global Resource Information Database
GRM	Ground Readiness Manager
GRS	Grid Reference System (SPOT)
GRT	Ground Readiness Test
GRTP	Ground Readiness Test Plan
GRTT	Ground Readiness Test Team
GS	Ground System Ground Segment
GSA	U.S. General Services Administration Ground Station Analyst
GSaaS	Ground Station as a Service
GSC	Ground Station Controller
GSCCB	Ground System Change Control Board
GSCDR	Ground System Critical Design Review
GSD	Ground Sampling Distance Guide Star Data
GSDD	Ground System Design Document
GSDRB	Ground System Discrepancy Review Board
GSE	Ground Support Equipment Ground Station Engineers Ground System Engineer Ground System Element
GSFC	Goddard Space Flight Center
GSI	Ground Station Identifier Ground System Infrastructure Ground Support Infrastructure
GSICS	Global Space-based Intercalibration System
GSIRD	Ground System Interface Requirements Document
GSIT	Ground System Integration
GSITP	Ground System Integration and Test Plan
GSIWG	Ground System Interface Working Group
GSL	GNU Scientific Library
GSLC	Geocoded Single-Look Complex
GSM	Ground System Manager
GSMO	Ground System Management Office Ground System and Mission Operations
GSMOR	Ground System Mission Operations Review
GSOCD	Ground System Operations Concept Document
GSOPD	Ground System Operations Plan Document
GSPDR	Ground System Preliminary Design Review
GSRD	Ground System Requirements Document
GSRR	Ground System Requirements Review
GSRT	Ground System Review Team
GSRVM	Ground System Requirements Verification Maintenance
GSSIR	Ground System to Spacecraft Integration Rack
gSSURGO	Gridded Soil Survey Geographic Database
GSSP	Guide for Developing Security Plans for Information Technology Systems
GST	Geographic Support Team Ground Station Technician Global Stocktake
GSTDN	Ground Spaceflight Tracking and Data Network
GSVVP	Ground System Verification and Validation Plan
GSVWG	Ground System Verification Working Group
GSWG	Ground System Working Group
GTID	Global Transaction Identifier
GTOPO30	Global 30 Arc-Second Elevation Data Set
GTOS	Global Terrestrial Observing System
GTT	GNE Test Team
GUI	Graphical User Interface
GWENS	GroundWater Exploration Navigation System
GXA	Gimbaled X-Band Antennae

H/W	Hardware
HA	High Availability
HAAT	Header, Ancillary, Annotation, and Trailer
HALE	High Altitude Long Endurance
HBR	Hard Body Radius
HC	Hard Copy
HCA	Horizontal Collimator Assembly
HCMP	Hardware Configuration Management Plan
HCR	Hardware Configuration Request Hardware Change Request
HDDS	Hazards Data Distribution Systems
HDF	Hierarchical Data Format
HDF-EOS	Hierarchical Data Format - Earth Observing System
HDF-EOS2	Hierarchical Data Format - Earth Observing System (version 2)
HDF5	Hierarchical Data Format Version 5
HDF5-EOS	Hierarchical Data Format Version 5 - Earth Observing System
HDFS	Hadoop File System
HDLC	High-Level Data Link Control
HDM	Hardware Data Manager HSM Data Manager
HDP	HDF Dumper
HDR	Header High Data Rate
HDRM	High Data Rate Modem
HDS	Horizontal Display Shift
HDT	High-Density Tape
HDTR	High-Density Tape Recorder
HE	Hardware Engineer
HEE	Half Edge Extent
Hex	Hexadecimal
HgCdTe	Mercury Cadmium Telluride
HGS	Hallway Ground Station
HIE	High Interest Event
HIRS	High-Resolution Infrared Sounder
HITL	Hour in the Life
HK	Housekeeping
HKDB	Housekeeping Data Buffer
HLD	High-Level Document
HLS	Harmonized Landsat and Sentinel-2
HMP	Hardware Management Plan
HOM	Hotine Oblique Mercator
HOMFiH	Homogeneity Filter
HOT	Haze Optimized Transformation
HP	Horizontal Polarization
HPA	High-Power Antenna High Power Amplifiers
HPC	High Performance Computing
HPIG	Hosted Payload Interface Guide
HPN	Panchromatic Band Header File
HPP	Highest Point in Polygon
HQ	Headquarters
HR	Human Resources Heritage Review Horizontal Resolution
HR MSI	High-Resolution Multispectral Imager
HRS	Horizontal Resampling Space
HRV	High-Resolution Visible (SPOT sensor)
HSI	Hyperspectral Imagery Hyperspectral Imager
HSM	Hierarchical Storage Management Hierarchical Storage Manager
HSPD	Homeland Security Presidential Directive
HTC	High Throughput Computing
HTM	Thermal Bands Header File
HTML	Hypertext Markup Language
HTSI	Honeywell Technology Solutions Inc.
HTTP	Hypertext Transfer Protocol
HTTPS	Hypertext Transfer Protocol Secure
HUB	Historically Underutilized Business
HVAC	Heating, Ventilation & Air Conditioning
HVU	High-Volume User
HWCI	Hardware Configuration Item
Hz	Hertz

I	In-Phase Channel
I&T	Integration and Test
I/O	Input/Output
I/Q	In-phase and Quadrature Modulation Components
I1	Internet 1
I2	Internet 2
I2I	Image-to-Image
I2RV	Improved Inter-Range Vector Message
IA	Implementing Agreement or Impact Analysis International Activities Interagency Agreement
IAA	Interagency Agreement
IaaS	Infrastructure as a Service
IAC	Independent Assurance Contractor Issue Assessment Code
IaC	Infrastructure as Code
IAD	Ion-Assisted Deposition
IAM	Identity and Access Management Inclination Adjustment (Delta I) Maneuver
IAR	Image Anomaly Report
IARPA	Intelligence Advanced Research Projects Activity
IAS	Image Assessment Subsystem Image Assessment System
IASICP	IAS Internal Calibrator Pulse
IATO	Interim Authority To Operate
IAU	International Astronomical Union
IAW	In Association With
IBM	International Business Machines
IBR	Integrated Baseline Review
IC	Interface Control International Cooperator Internal Calibrator Internal Cache
ICD	Interface Control Document
ICDR	Instrument Critical Design Review
ICe	Internal Calibrator processing for Emissive bands
ICF	Initial Correction Factor
ICMP	Internet Control Message Protocol
ICO	International Cooperator Office
ICT	Interface Connectivity Testing
ICVS	Independent Calibration and Verification Segment Independent Characterization and Verification System
ICWP	IC Web Portal
ID	Infrastructure Design Interface Documents Identification
IDCC	Interval Data Collection Concept
IDCO	Image Data Collection Omission
IDCP	Interval Data Collection Plan
IDCS	Image Data Collection Schedule
IDD	Interface Definitions Document
IDE	Integrated Device Electronics Infrastructure Development Integrated Development Environment
IDF	Interval Definition File Image Data File
IDIQ	Indefinite Delivery Indefinite Quantity
IDL	Interactive Data Language
IDP	Individual Development Plan
IDPS	Image Data Processing Subsystem
IDR	IAS Data Recorder
IDS	Intrusion Detection System Interval Delivery Subsystem
IDSO	Image Data Schedule Omission
IDSR	Image Data Status Report Image Data Schedule Report Integrated Daily Status Report
IDWR	Idaho Department of Water Resources
IE	Infrastructure Element
IEC	iStat Executive Committee International Electrotechnical Commission
IEEE	Institute of Electrical and Electronics Engineers
IEM	Integrated Electronics Module
IERS	International Earth Rotation Service
IETF	Internet Engineering Task Force
IF	Intermediate Frequency
IFAT	ITOS File Accounting Tool
IFB	Invitation for Bid
IFD	Image File Directory
IFFT	Inverse Fast Fourier Transform
IFL	Interfacility Link
IFOV	Instrument Field of View Instantaneous Field of View
IGARSS	International Geoscience and Remote Sensing Symposium
IGE	Independent Government Estimate
IGMP	Internet Group Management Protocol
IGS	Integrated Security Gateway International Ground Station
IIOP	Internet Inter-ORB Protocol
IIR	Image Impact Report
IIRR	Instrument Integration Readiness Review
IIRV	Improved Inter-Range Vector
IITL	Interval-In-The-Life
IKE	Internet Key Exchange
ILI	IGS to LAM Interface
IM	Instant Message Inclination Maneuver
IMAR	Instrument Mission Assurance Requirement
IMB	Issue Management Board
IMF	Inverse Minor Frames Interval Metadata File
IMP	Information Management Plan Integrated Master Plan
IMR	Issue Management Record
IMS	Integrated Master Schedule Information Management System Information Management Services
IMT	Integrated Mission Timeline Information Management Technology
IMU	Inertial Measurement Unit Internal Measurement Unit
IMWD	Internet Moving Window Display
IN	Impulse Noise or Ingest
INC	Inclination Maneuver
INCITS	International Committee for Information Technology Standards
INCOSE	International Council on Systems Engineering
Inf	Infrastructure
INFOSEC	Information Security
ING	Ingest
INM	IGS Network Manager
INPE	National Institute for Space Research (Brazil)
InSb	Indium Antimonite
INT	Signed Integer
INT16	16-bit Signed Integer
INTR	Interpreted Layer
INTSM	Interpreted Layer with Some Masks Applied
INTWAM	Interpreted Layer with All Mask Applied
INV	Inventory
IOC	Initial Operational Capability Initial On-orbit Checkout Installation Operational Certification In-Orbit Checkout Initial Operational Configuration Intergovernmental Oceanographic Commission
IOCCG	International Ocean Colour Coordinating Group
IOE	Instrument Operations Element
IOI	Inventory Operations Interface
IONET	IP Operational Network
IoT	Internet of Things
IP	Internet Protocol Installation Plan Intellectual Property International Partnership
IPA	Interproject Agreement Instrument Pallet Assembly
IPAC	Intergovernment Payment and Collection
IPC	Institute for Interconnecting and Packaging Electronic Circuits Inter-Process Communication
IPCC	Intergovernmental Panel on Climate Change
IPComp	IP Payload Compression Protocol
IPDR	Instrument Preliminary Design Review
IPDS	Information Product Data System
IPDU	Internet Protocol Data Unit
IPE	Image Processing Element
IPM	IGS Priority Mask Online Tool IGS Priority and Request Map Incyte Project Manager Integrated Payload Module
IPMR	Integrated Program Management Report
IPMS	Integrated Project Management System
IPMSD	Integrated Project Management System Description
IPO	Integrated Program Office
IPP	Invoice Processing Platform
IPR	Intersegment Problem Report
IPS	Intrusion Prevention System Image Processing System
IPSec	Internet Protocol Security
IPSR	Instrument Preship Review
IPT	Integrated Project Team Integrated Product Team Integrated Program Team
IPV	Integrated Pulse Value
IQE	Image Quality Estimation
IR	Infrared
IRB	Investment Review Board
IRD	Interface Requirements Document
IRFP	Implementation Request for Proposal
IRIG	Inter-Range Instrumentation Group
IRLS	Iteratively Reweighted Least Squares
IRP	Incident Reporting Plan
IRR	Integrated Readiness Review
IRS	Interface Requirements Specification
IRU	Inertial Reference Unit
IRV	Improved Inter-Range Vector Message
IS	Ingest System
ISA	Internet Security and Acceleration Interconnection Security Agreement
ISAB	Integrated Science and Applications Branch
ISC	International Science Council
ISCCP	International Satellite Cloud Climatology Project
ISCP	Information System Contingency Plan
iSCSI	Internet Small Computer System Interface
ISD	Interface Specification Document
ISE	Instrument Support Electronics
ISF	Instrument Support Facility
ISI	Integral Systems Incorporated
ISIS	Integrated Software for Imagers and Spectrometers
ISL	Interswitch Link
ISO	International Organization for Standardization
ISP	Imaging Spectroscopy Project
ISPRS	International Society for Photogrammetry and Remote Sensing
ISRO	Indian Space Research Organization
ISSLOB	Information Systems Security Line of Business
ISSO	Information System Security Official
IST	Integrated System Test
ISTESR	Ingest Subsystem Test Execution Summary Report Inventory Subsystem Test Execution Summary Report
IT	Information Technology Integration Test Instrument Telemetry
ITAR	International Traffic in Arms Regulations
ITC	Integration Test Case
ITHR	Instrument Transition Handover Review
ITIP	Information Technology Infrastructure Plan
ITOS	Integrated Test and Operations System
ITP	Integration Test Plan
ITRF	International Terrestrial Reference Frame
ITRS	International Terrestrial Reference System
ITS	Information Technology Services Integrated Time Sweep
ITSD	Information Technology Services Division
ITSEC	Information Technology Security
ITSNOC	Information Technologies Service Network Operations Center
ITSOT	Information Technology Security Operations Team
ITSS	Information Technology and Scientific Services
ITU	International Telecommunications Union
IU	Individual User
IUR	Individual User Request
IV&V	Independent Verification and Validation
IVM	Interface Verification Matrix
IVOS	Infrared and Visible Optical Sensors
IW&DS	Information Warehouse and Data Store
IWAD	Individual Work Authorization Document
IWG	Interface Working Group
IWT	Image Window Table Integer Wavelet Transform

J2EE	Java 2 Platform, Enterprise Edition
JACIE	Joint Agency Commercial Imagery Evaluation
JALBTCX	Joint Airborne LiDAR Bathymetry Technical Center of Expertise
JAR	Java Archive
JASON	Joint Activity Simulation for Observatories and Networks
JAXA	Japan Aerospace Exploration Agency
JaxB	Java Architecture for XML Binding
JBOD	Just a Bunch Of Disks
JBOSS	J2EE Application Server
JCL	Joint Confidence Level
JDBC	Java Database Connectivity
JDK	Java Development Kit
JFIF	JPEG File Interchange Format
JIT	Just-In-Time (Compiler)
JMS	Java Messaging Service
JMSRA	Java Message Service Resource Adapter
JPEG	Joint Photographic Experts Group
JPF	Job Parameter File
JPL	Jet Propulsion Laboratory
JPSS	Joint Polar Satellite System
JSA	Johannesburg, South Africa Ground Station
JSON	JavaScript Object Notation
JSP	Java Server Pages
JSpOC	Joint Space Operations Center
JSR	Java Portlet Specification
JSX	Java HTML-like syntax
JTS	Java Topology Suite
JVM	Java Virtual Machine
JWT	JSON web token

K	Degrees Kelvin
K8s	Kubernetes
KA8	Known Anomaly Eight
KARI	Korea Aerospace Research Institute
KB	Kilobyte
Kbps	Kilobits per second
KBps	Kilobytes per Second
KBR	Kellogg Brown & Root
KDP	Key Decision Point
kg	Kilogram
KHB	Kennedy Space Center Handbook
KHC	Kashi, China Ground Station
kHz	Kilohertz
KIS	Kiruna, Sweden Ground Station
km	Kilometer
KMA	Korean Meteorological Administration
KMI	Key Management Infrastructure
KML	Keyhole Markup Language
KMP	Key Management Plan
KMS	Key Management Service
kPa	Kilopascal
KPI	Key Performance Indicator
KPM	Key Performance Measures
KPR	Key Performance Requirement
KSAT	Kongsberg Satellite Services
KSC	Kennedy Space Center
Ksps	Kilo-Symbols per Second
KUJ	Kumamoto, Japan Ground Station
KVM	Keyboard Video Mouse

L&C	Likelihood and Consequence
L&EO	Launch and Early Orbit
L+30	Launch + 30 Days
L+60	Launch + 60 Days
L+90	Launch + 90 Days
L0	Level 0 Data Product
L0c	Level 0 Corrected
L0R	Level 0 Reformatted
L0Ra	Level 0 Reformatted Archive
L0Rc	Level 0 Reformatted Corrected
L0Rp	Level 0 Reformatted Product
L1	Level 1 Data Product or Landsat 1
L1AOS	Level 1 Automatic Ordering System
L1G	Level 1 Geometrically (Corrected)
L1Gs	Level 1 Geometric Systematic
L1Gt	Level 1 Systematic Terrain (Corrected)
L1P	Level 1 Precision (Corrected)
L1R	Level 1 Radiometric (Corrected)
L1R-H	Hybrid Level 1 Radiometric
L1SE	Level 1 Sustaining Engineering
L1T	Level 1 Terrain (Corrected) Level 1 Precision and Terrain
L1TP	Level 1 Terrain Precision (Corrected)
L2	Level 2 Data Product or Landsat 2
L2+	Level 2+
L2GT	Level 2 Systematic Terrain (Corrected)
L2PGS	Level 2 Product Generation System
L2PS	Level 2 Processing Subsystem
L2SP	Level 2 Science Product
L2SR	Level 2 Science Product, Reflectance only
L2TP	Level 2 Terrain Precision (Corrected)
L3	Level 3 Landsat 3
L3+	Level 3+
L3PGS	Level 3 Product Generation System
L4	Level 4 Landsat 4
L5	Level 5 Landsat 5
L7	Landsat 7
L8	Landsat 8
L9	Landsat 9
LAADS	Landsat Atmosphere Archive and Distribution System
LAASPA	Landsat Acquisition and Special Planning Application
LACCA	Land Automated Cloud Cover Assessment
LACS	Landsat Archive Conversion System
LADS	LDCM Archive and Dissemination Segment
LAM	Landsat Archive Manager
LAM AS	LAM Archive Server
LAM008	Interface Between COI PS and L0Rp PS
LAN	Local Area Network
LANCE	Land, Atmosphere Near Real-Time Capability for EOS
LandIS	Landsat Next Instrument Suite
LaRC	Langley Research Center
LAS	Land Analysis System
LASP	Laboratory for Atmospheric and Space Physics
LaSRC	Land Surface Reflectance Code
LASSO	Least Absolute Shrinkage and Selection Operator
LAT	Latitude Lab Acceptance Test
LBG	Libreville, Gabon Ground Station
LBS	Lidar Base Specification
LC	LDCM Contractor
LCA	Land Change Assessment
LCACHG	Annual Land Cover Change
LCAMS	Land Cover Artificial Mapping System
LCB	Load Control Board
LCC	Lambert Conformal Conic or Lifecycle Cost
LCCB	Landsat Configuration Control Board
LCCR	Landsat Configuration Change Request
LCG	Landsat Coordination Group
LCGS	LDCM Contractor Ground Segment
LCIPS	Landsat Cloud Image Processing System
LCLUA	Land Cover and Land Use Analysis
LCMAP	Land Change Monitoring, Assessment, and Projection
LCMASK	Land Cover Mask Band
LCMS	Landscape Change Monitoring System
LCNext	Land Cover Next
LCPCONF	Primary Land Cover Confidence
LCPRI	Primary Land Cover
LCR	Logical Change Record LTAP Collection Request
LCS	Land Change Science
LCSCONF	Secondary Land Cover Confidence
LCSEC	Secondary Land Cover
LCSS	LDCM Contractor Space Segment Land Change Science System
LCU	Load Control Unit
LDAP	Lightweight Directory Access Protocol
LDB	IAS Local Database or Land Database
LDCC	Landsat Data Continuity Contract
LDCM	Landsat Data Continuity Mission
LDCMGS	Landsat Data Continuity Mission Ground Station
LDCMSC	Landsat Data Continuity Mission Spacecraft
LDCP	LSDS Data & Capabilities Partnerships
LDDMWG	Landsat Data Distribution and Marketing Working Group
LDDWG	Landsat Data Distribution Working Group
LDMT	Landsat Data Management Team
LDI	LPS Data Ingest or L0Ra Data Ingest
LDIF	LDAP Data Interchange Format
LDIS	LAM to DORRAN Interface System
LDPC	Low-Density Parity Check
LDPS	Landsat Data Purchase System
LDRCS	LDCM Document Review Comment Spreadsheet
LDTS	LPS Data Transfer Subsystem
LE90	Linear Error 90 Percent
LEDAPS	Landsat Ecosystem Disturbance Adaptive Processing System
LEI	LAM to ECS Interface
LEM	Lower Equipment Module
LEO	Low-Earth Orbiting Launch and Early Orbit
LEO&A	Launch, Early Orbit and Activation
LEO&C	Launch, Early Orbit & Commissioning
LEO-T	Low-Earth Orbiter-Terminal
LES	Log file Extraction Services
Level A	Level Zero Aggregated
LF	Line-Feed
LFAT	Landsat File Accounting Tool
LFO	Landsat Flight Operations
LFRDB	Landfire Reference Database
LG	L0Ra Generator
LGAC	Landsat Global Archive Consolidation
LGGS	Landsat Global Geodetic Standard
LGN	Landsat Ground Network
LGNT	Landsat Ground Network Test
LGO	Landsat Ground Operations
LGPL	Lesser General Public License
LGS	Landsat 7 Ground System Landsat Ground Station
LGSOWG	Landsat Ground Station Operations Working Group
LH	Left Hand
LHC	Left-Hand Circular L0Ra Histogram Characterization
LHCP	Left-Hand Circularly Polarized
LHS	Left-Hand Side Left-Hand SLO
LIB	Library
LICS	Landsat International Communication System
LID	Landsat and LDCM Inventory Database LSDS Inventory Database
LiDAR	Light Detection and Ranging
LIFO	Last In, First Out
LIL	Landsat Inventory Loader
LIM	Landsat Inventory Management LDCM Interface for Metadata Lunar Irradiance Model
LIMA	Landsat Image Mosaic of Antarctica Landsat Inventory Metadata Application
LIMB	LAM Interface for Metadata and Browse
LINEAGEQA	Lineage Index
LIR	LDCM in Retrospect
LIS	Landsat Integration System LACS Inventory System
LISS-III	Linear Imaging Self-Scanning Sensor III
LITAP	Landsat Intersegment Technical Assessment Panel
LKPC	Landsat Kubernetes Processing Controller
LL	Lower Left Lessons Learned
LLI	LAM to LACS Interface
LLIS	LAM LPGS Interface Subsystem
LM	Labeled Mask
LMASK	Labeled Mask
Lmax	Maximum Radiance
LMC	Lockheed Martin Corporation
LMCM	Launch Management Coordination Meeting
LMD	Landsat Mission Database
LMDD	Landsat Metadata Description Document
LMDRS	Landsat Metadata Documentation and Reporting System
LMI	Lower Equipment Module Interface
Lmin	Minimum Radiance
LMM	Landsat Mission Manager
LMMS	Lockheed Martin Missiles and Space
LMO	Landsat Mission Operations
LMOC	Landsat Multi-Satellite Operations Center
LMOCRD	Landsat Multi-Satellite Operations Center Requirements Document
LMOO	LMO Ops Crew
LMOP	Land Satellites Data System Mission Operations Project
LMST	Local Mean Solar Time
LMT	Landsat Metadata Transformation
LMWS	Landsat Missions Website
LN2	Liquid Nitrogen
LNA	Low-Noise Amplifiers
LNET	Lustre Networking
LNext	Landsat Next
LO	Local Oscillator
LOA	Letter of Agreement
LOC	Letter of Cooperation Line of Code
LOE	Level of Effort
LON	Longitude
LOOFA	Landsat 7 On-Orbit Flight Automation
LOP	Landsat Operational Procedure
LOS	Loss of Signal or Line-of-Sight
LP DAAC	Land Processes Distributed Active Archive Center
LPCS	Land Product Characterization System
LPDS	Level 1 Product Distribution System LDCM Data Product Specification
LPGS	Landsat Product Generation System
LPGSUI	Level 1 Product Generation Subsystem User Interface Landsat Product Generation System User Interface
LPIP	Landsat Product Improvements Project
LPO	Landsat Program Office LSDS Program Office
LPS	Landsat 7 Processing System Landsat Processing System
LPSNG	Landsat Processing System Next Generation
LPSO	Landsat Project Science Office
LPT	Limited Performance Test
LPV	Land Product Validation
LR	Lower Right
LRD	Launch Readiness Date
LRMA	Land Resources Mission Area
LRMB	LDCM Risk Management Board
LRR	Launch Readiness Review
LRS	Land Remote Sensing Landsat Remote Sensing
LRSP	Land Remote Sensing Program
LS	Launch Segment
LSAA	Landsat and Sentinel-2 Archive / Access Landsat Sentinel Archive Access
LSATH	High-Saturation Radiance
LSATL	Low-Saturation Radiance
LSB	Least Significant Bit Low Surface Brightness
LSC	Landsat Security Committee
LSCF	Landsat Solar Calibration Frame
LSDS	Land Satellites Data System
LSF	Line Spread Function
LSIMSS	LDCM Scalable Integrated Multi-Mission Support System Landsat Scalable Integrated Multi-Mission Support System Landsat Scalable Integrated Multi-Mission Simulation System
LSIS	LSDS Science Information System
LSM	Land Survey Mission
LSO	LDCM Science Office LSRD Science Office
LSP	Launch Support Program Logistics Support Plan
LSQ	Least Squares
LSQAT	Landsat Science Quality Assurance Team
LSR	Launch Support Room
LSRD	LSDS Science Research and Development
LSS	Launch Services Segment
LST	Landsat Science Team Land Surface Temperature Landsat Surface Temperature
LST/E	Land Surface Temperature and Emissivity
LSTM	Land Surface Temperature Monitoring
LTA	Long-Term Archive
LTAP	Long-Term Acquisition Plan
LTAP-7	Landsat 7 Long-Term Acquisition Plan
LTAP-8	Landsat 8 Long-Term Acquisition Plan
LTAP-9	Landsat 9 Long-Term Acquisition Plan
LTAS	Landsat Trending and Analysis System
LTI	Legacy Tape Ingest
LTO	Linear Tape Open
LTS	LACS Transcription System
LTTS	LPCS Trending Tool Suite
LTVA	Limited Technical Vulnerability Assessment
LTWG	Landsat Technical Working Group
Ltypical	Typical Radiance
LUCAS	Land Use/Cover Area Frame Survey
LULC	Land Use & Land Cover
LUN	Logical Unit Number
LUT	Look-Up Table
LV	Launce Vehicle
LVA	Launch Vehicle Adapter
LVDS	Low Voltage Differential Signaling
LVDT	Linear Variable Differential Transformer
LVRR	Launch Vehicle Readiness Review
LWIR	Long Wavelength Infrared
LXR	Landsat Transfer Radiometer

m	meter
M&PCB	Materials and Processes Control Board
M&PCP	Materials and Processes Control Program
M&V	Monitoring and Validation
M-CDR	MOC Critical Design Review
M-PDF	MOC Preliminary Design Review
M-SIR	MOC System Integration Review
M-SRR	MOC System Requirements Review
M_PDU	Multiplexing Protocol Data Unit
M2M	Machine-to-Machine
MA	Mission Archive Multiple Access Major Application Mission Assurance
MAA	Mission Acquisition Analyst
MAC	Media Access Control Monitor and Control Subsystem Mass Acceleration Curve
MACS	MSS-X Archive Conversion System Monitor and Control Subsystem
MAD	Median Absolute Deviation
MAE	Materials Assurance Engineer
MAID	Massive Array of Idle Disks Master Action Item Database
MAIN	Modified Atmospheric Correction for Inland Waters
MAL	Master Activities List
MAN	Maritime Aerosol Network
MAM	Mission Assurance Manager
MAP	Mission Assurance Plan
MAPD	Mean Absolute Percent Difference
MAR	Mission Assurance Requirements
MARCE	Multi-Attribute Requirements-Capabilities Evaluator
MAS	MODIS Archive System
MATLAB	Matrix Laboratory
MAUT	Multi-attribute Utility Theory
MAX	Maximum
MB	Megabyte
MBO	Management by Objects
Mbps	Megabit per Second
MBR	Minimum Bounding Rectangle
MBSRN	Multiband Spectral Relationship Near-Infrared
MBSRV	Multiband Spectral Relationship Visible
MBW	Model-Building Workbook
MC	MAC Controller or Memory Control
MCDL	Master Configured Document List Master Controlled Document List
MCDR	Mission Critical Design Review
MCE	Mirror Control Electronics
MCM	Multichip Module
MCR	Mission Concept Review
MCS	Monitor and Control Subsystem
MD	Metrics Database Mission Data
MD5	Message-Digital Algorithm 5 Message-Digest Algorithm 5
MDA	MacDonald, Dettwiler, and Associates
MDD	Metrics Driven Development
MDF	MOC Directive File Mission Data File
MDGLS	Mid-Decadal Global Land Survey
MDH	Mission Data Header
MDIO	Mission Data Input / Output
MDL	Metadata Loader
MDM	Mission Data Management
MDR	Mission Dress Rehearsal Mission Definition Review
mDRC	mini-Design Reference Case
MDS	MMO Database System Metadata Server
MDSL	Master Data Source List
MDT	Metadata Target
ME	Memory Effect
MEaSUREs	Making Earth System Data Records for Use in Research Environments
MEB	Materials Engineering Branch Main Electronics Box Main Electronics Board
MEC	Metrics ETL Component
MECO	Main Engine Cutoff
MEF	Mission Essential Function
MEO	Matrixed Engineering Organization
MEOS	Multi-Mission Earth Observation System
MEOW	Minimum Expected Observation Window
MER	Mission Equipment Room
MERIS	Medium Resolution Imaging Spectrometer
MERRA	Modern-Era Retrospective Analysis for Research and Applications
MERRA-2	Modern-Era Retrospective Analysis for Research and Applications, Version 2
MET	Mission Elapsed Time Model Evaluation Tool Meteorological Data
METAR	METeorological Aerodrome Reports
METRIC	Satellite-Based Energy Balance for Mapping Evapotranspiration With Internalized Calibration
MEXT	Ministry of Education, Culture, Sports, Science, and Technology (Japan)
MF or mf	Minor Frame
MFC	Microsoft Foundation Classes MAC Fetch CPF
MFPS	Major Frame Processing Subsystem
MFR	Multifunctional Receiver
MG	Metadata Generator
MG1	McMurdo, Antarctica
MGS	MODIS Ground Station Management Server
MGT	Management Target
MHz	Megahertz
MI	Mutual Information
MIG	Meeting Information Guide
MIL	Materials Identification List MAC Inventory L0Ra
MIN	Minimum
MIR	Mid-Infrared
MIRBI	Mid-Infrared Burn Index
MIS	Master Integrated Schedule Management Information System
MISR	Multiangle Imaging Spectroradiometer
MISTE	Modular Integrated Simulation and Test Environment
MIT	Massachusetts Institute of Technology
MJF	Major Frame
MJP	MAC Job Processor
ML	Machine Learning
ML1R	Mission Level 1 Requirements
MLC	Most Likely Case
MLDRCS	Master LDRCS
MLH	Maximum Likelihood Estimate
MLI	MACS to LAM Interface Multi-Layer Insulation
MLP	Multi-layer Perceptron
MLT	Mean Local Time
MM	Multi-Mission Mission Manager
mm	Millimeter
MM&A	Mission Monitor & Analysis
mm/hr	Millimeters per Hour
MMA	Mission Management Analyst
MMIO	Modified Moravec Interest Operator
MMO	Mission Management Office
MMOIO	Mission Management Office Information Officer
MMOSA	MMO Security Activity
MMOSE	Mission Management Office Systems Engineer
MMR	Mission Requirements Review
MMS	MDGLS Management System Multi-Mission Modular Spacecraft
MMU	Memory Management Unit
MNDWI	Modified Normalized Differences Wetness Index
MO&DSD	Mission Operations and Data System Directorate
MOA	Memorandum of Agreement
MOC	Mission Operations Center
MOCRD	Mission Operations Center Requirements Document
MOD	MODIS Terra
MOD09	MODIS Surface Reflectance – Terra Satellite
MOD11	MODIS Land Surface Temperature and Emissivity – Terra Satellite
MOD13	MODIS Vegetation Indices – Terra Satellite
MODAPS	MODIS Adaptive Processing System
MODIS	Moderate Resolution Imaging Spectroradiometer
MODNET	MO&DSD Operational/Development Network
MODTRAN	Moderate Resolution Atmospheric Transmission
MOE	Mission Operations Element
MOERD	Mission Operations Element Requirements Document
MOI	Moment of Inertia
MOM	Mission Operations Manager
MOP	Mission Operations Plan
MOPSS	Mission Operations Planning and Scheduling System
MOR	Mission Operations Room Mission Operations Review
MORKA	Mission Operations Readiness Key Activities
MORM	Mission Operations Readiness Manager
MOS	Mission Operations Simulation
MOTS	Mission Off-The-Shelf Military Off-The-Shelf Modified Off-The-Shelf
MOU	Memorandum of Understanding
MOVE	Mission Operations Voice Enhancement
MOWG	Mission Operations Working Group
MP	Multiprocessor Mission Planner or Mission Planning
MPEG	Moving Picture Experts Group
MPLS	Multiprotocol Label Switching
MPR	Monthly Progress Review
MPS	MODIS Processing System Mission Plan System Mission Planning and Scheduling
MPSR	Management Program Status Review Monthly Project Status Report
MQ	Messaging Queue
MR	Management Reserve
MRAM	Magnetoresistive Random Access Memory
MRB	Milestone Review Board Material Review Board
MRC	Metrics Reporting Component Metadata Record
MRF	Meta Raster Format
MRG	Metrics Report GUI
MRLC	Multiresolution Land Characteristics
MRR	Mission Requirements Review
MRT	Mission Readiness Testing
MRTG	Multirouter Traffic Grapher
MS	Multispectral Mission Simulations
ms	millisecond
MSA	Master Schedule of Activities
MSAVI	Modified Soil Adjusted Vegetation Index
msb	Most Significant Bit
MSB	Most Significant Byte
MSCD	Mirror Scan Correction Data
MSE	Mission Systems Engineering
MSFC	Marshall Space Flight Center
MSI	Multispectral Instrument Multispectral Imager
MSK	Receive Antenna Horizon Mask Message Managed Streaming for Apache Kafka
MSM	Multiservice Mobility Mission Simulations Manager Management Switch Module Mission Operations Center Systems Manager
MSO	Mission Support Office
Msps	Mega-Symbols per Second
MSPSP	Missile System Prelaunch Safety Data Package
MSR	Monthly Status Review
MSS	Multispectral Scanner Mass Storage System
MSS-A	Multispectral Scanner - Archive Format
MSS-P	Multispectral Scanner - Processed Format
MSS-R	Multispectral Scanner - Raw
MSS-X	Multispectral Scanner data, reformatted CCT-X data
MSSG	Microwave Sensors Subgroup
MST	Mission Support Team
MTA	Metadata
MTASS	Multi-Mission Three-Axis Stabilized Spacecraft
MTBF	Mean Time Before Failure
MTBS	Monitoring Trends in Burn Severity
MTDSS	MS and TM Data Subsetting System
MTF	Modulation Transfer Function
MTFC	Modulation Transfer Function Compensation
MTHR	Mission Transition Handover Review
MTI	Matera, Italy
MTL	Level 1 Metadata or Metadata Text File Extension
MTP	Distribution Product Metadata
MTR	Mission Transition Review
MTS	MDS Transformation Services
MTTR	Mean Time to Restore Mean Time to Repair Mean Time to Recovery
MTU	Maximum Transmission Unit
MU	Mobile Unit
MUA	Materials Usage Agreement
MUSES	Multiple User System for Earth Sensing
mW	milliWatt
MWD	Moving Window Display
MWIR	Mid-wave Infrared
MXL	Multimodeling eXchange Language
MYD	MODIS Aqua
MYD09	MODIS Surface Reflectance – Aqua Satellite
MYD11	MODIS Land Surface Temperature and Emissivity – Aqua Satellite
MYD13	MODIS Vegetation Indices – Aqua Satellite
MYSA	Malaysian Space Agency

N/A	Not Applicable
N/T	Normal-Through
N0	Noise Density
N2	N-Squared
NAD27	North American Datum 1927
NAD83	North American Datum of 1983
NAIP	National Agriculture Imagery Program
NAK	Negative Acknowledgement
NALCMS	North American Land Change Monitoring System
NAPP	National Aerial Photography Program
NARA	National Archive and Records Administration
NARR	North American Regional Reanalysis
NAS	NASA Assurance Standard Network Attached Storage
NASA	National Aeronautics and Space Administration
NASADEM	National Aeronautics and Space Administration Digital Elevation Model
NASCOM	NASA Communications
NASDA	National Space Development Agency (Japan)
NASRDA	National Space Research Agency (Nigeria)
NAVOCEANO	Naval Oceanographic Office
NB	Narrow Band
NBAR	Nadir Bidirectional Reflectance Distribution Function Adjusted Reflectance
NBII	National Biological Information Infrastructure
NBR	Normalized Burn Ratio or Navigation Base Reference
NBRT	Normalized Burn Ratio Thermal
NCAC	National Civil Applications Committee
NCAR	National Center for Atmospheric Research
NCAS	National Carbon Accounting System
NCC	Network Control Center
NCI	Non-configured Item
NCR	Network Change Request Non-conformance Report
NCEP	National Centers for Environmental Prediction
NCSA	National Center for Supercomputing Applications
NCT	Network Connectivity Test
NDA	Non-Disclosure Agreement
NDBC	National Data Buoy Center
NDE	Non-Destructive Examination
NDEP	National Digital Elevation Program
NDF	NLAPS Data Format
NDI	Non-Development Items
NDIA	National Defense Industrial Association
NDMI	Normalized Difference Moisture Index
NDOP	National Digital Orthoimagery Program
NDP	National Satellite Land Remote Sensing Data Archive (NSLRSDA) Data Package
NDPF	NASA Data Processing Facility
NDSI	Normalized Difference Snow Index
NDVI	Normalized Difference Vegetation Index
NDWI	Normalized Difference Water Index
NErT	Noise Equivalent Delta Temperature
NED	Natural Elevation Data National Elevation Data
NEDL	Noise Equivalent Detector Radiance Noise Equivalent Differential Luminance
NEDT	Noise Equivalent Detector Temperature Noise Equivalent delta Temperature
NEMA	National Electrical Manufacturers Association
NEN	Near Earth Network
NENUG	Near Earth Network User’s Guide
NEOG	National Earth Observation Group
NEOS	National Earth Orientation Service
NEPAG	NASA EEE Parts Assurance Group
NESDIS	National Environmental Satellite Data and Information Service
NET	No Earlier Than
NetCDF	Network Common Data Form
NewOps	New Operational Procedures System
NEX	NASA Earth Exchange
NFS	Network File System
NG	National Guard
NGA	National Geospatial Intelligence Agency
NGAC	National Geospatial Advisory Committee
NGDA	National Geospatial Data Asset
NGO	Non-Governmental Organization
NGP	National Geospatial Program
NGS	National Geodetic Survey
NGTOC	National Geospatial Technical Operations Center
NH	Northern Hemisphere
NHAP	National High Altitude Photography
NHB	NASA Handbook
NIC	Network Interface Card National Innovation Center
NIER	National Institute of Environmental Research
NIFC	National Interagency Fire Center
NIIRS	National Imagery Interpretability Rating Scale
NIOB	Niobrara, Nebraska
NIPD	Network Interface Planning Document
NIR	Near-infrared
NIRD	Network Interface Requirements Document
NIS	National Imagery Summit
NISAR	NASA-ISRO Synthetic Aperture Radar
NISN	NASA Integrated Services Network
NIST	National Institute of Standards and Technology
NITF	National Imagery Transformation Format
NKAU	National Space Agency of Ukraine
NLAPS	National Land Archive Production System
NLCD	National Land Cover Dataset National Land Cover Database
NLI	National Land Imaging
NLIP	National Land Imaging Program
NLIR	National Land Imaging Requirements
NLSR	Nighttime Light Surface Radiance
nm	Nanometer
NMAS	National Map Accuracy Standards
NMD	National Mapping Discipline
NMDB	Navigation and Mission Design Branch
NMS	Network Management Software
NN	Nearest Neighbor
NOA	New Obligating Authority
NOAA	National Oceanic and Atmospheric Administration
NOC	NUGS Operations Concept Network Operations Center
NOLAN	Nascom Operational Local Area Network
NOM	Network Operations Manager
NOR	NORAD Two Line Element Message
NORAD	North American Air Defense North American Aerospace Defense Command
NOTAM	Notice to Airmen
NOVAS	Naval Definition Vector Astronomy Software Naval Observatory Vector Astrometry Software
NP	Narrative Procedure
NPD	NASA Policy Directive
NPI	Norwegian Polar Institute
NPL	National Physical Laboratory
NPM	Node Package Manager
NPOESS	National Polar-orbiting Operational Environmental Satellite System
NPR	NASA Procedural Requirements
NPS	National Park Service
NPSL	NASA Parts Selection List
NPT	Network Performance Test
NPV	Net Present Value Net Pulse Value
NRCA	Nonconformance Reporting and Corrective Action
NRCS	Natural Resources Conservation Service
NRD	Network Requirements Document
NRO	National Reconnaissance Office
NRSCC	National Remote Sensing Center of China
NRT	Network Readiness Test Near Real Time
NRT-IC	Near Real Time for International Cooperators
NRTL	Nationally Recognized Testing Laboratory
NRZ-L	Non-Return to Zero-Level
NRZ-M	Non-Return to Zero-Mark
NSA	National Security Agency
NSC	Norwegian Space Centre
NSDI	Normalized Snow Difference Index National Spatial Data Infrastructure
NSF	National Science Foundation
NSG	Neustrelitz, Germany Ground Station
NSIDC	National Snow and Ice Data Center
NSLRSDA	National Satellite Land Remote Sensing Data Archive
NSM	Network and Security Manager
NSMC	National Satellite Meteorological Center
NSN/NSG	Neustrelitz Ground Station (Germany)
NSO	Nadir Simultaneous Overpass Netherlands Space Office
NSOF	NOAA Satellite Operations Facility
NSPAR	Nonstandard Parts Approval Request
NSS	NASA Safety Standard
NSSDA	National Standards for Spatial Data Accuracy
NSSDC	National Space Science Data Center
NSTC	National Science and Technology Council
NSTT	New Space Task Team
NTE	Not-To-Exceed
NTIA	National Telecommunications and Information Administration
NTP	Network Time Protocol
NTR	New Technology Report
NUC	Non-Uniformity Correction
NUGS	NASA-USGS Joint Ground System
NUP	North Up
NUSO	National Uncrewed Systems Office
NVM	Non-Volatile Memory
NWI	National Wetlands Inventory
NWIS	National Water Information System
NWP	Numerical Weather Prediction
NWS	National Weather Service

O&M	Operations & Maintenance
O&S	Operations & Sustaining
O-CCB	Operations Configuration Control Board
O-PRB	Operations Products Review Board
OA	Operational Archive Operations Agreement Operations Analyst Orbital Alliant Tech Systems Office Automation
OAC	Opportunity Assessment Code
OAD	Operational Algorithm Description
OAG	Office of Acquisitions and Grants
OAR	On-Orbit Acceptance Review Operational Acceptance Review
OAV	Operational Verification Assessment
OB	Orbit Reference Frame
OBC	Onboard Computer Onboard Calibrator Onboard Blackbody Calibrator
OBE	Overcome By Events
OBP	Onboard Processor
OBPG	Ocean Biology Processing Group
OBS	Organizational Breakdown Structure
Obs-IRD	Observatory Interface Requirements Document
OC	Online Cache or Operations Concept
OCAO	Office of the Chief Administrative Officer
OCC	Operator Control Console or Occurrence
OCD	Operations Concept Document
OCE	Office of Chief Engineering
OCI	Organization Conflict of Interest
OCIO	Office of the Chief Information Officer
OCM	Operational Configuration Management Orbital Conjunction Message
OD	Orbit Determination Orbital Debris
ODBC	Open Database Connectivity
ODC	Other Direct Costs Open Data Cube
ODI	On-Demand Interface
ODL	Object Description Language Object Definition Language
ODNI	Office of the Director of National Intelligence
ODOS	Order Distribution and Order Status
ODS	Order Distribution Service
OE	Operations Engineer
OEI	Office of Enterprising Information
OEM	Original Equipment Manufacturer Oracle Enterprise Manager
OFE	Order Fulfillment Element
OGC	Open Geospatial Consortium
OH	Optical Head
OHS	Order Handler Subsystem
OIRD	Observatory Interface Requirements Document
OIS	OLI-2 Interface Simulator
OITL	Orbit-In-The-Life
OIV	On-orbit Initialization and Verification
OJT	On-The-Job Training
OLAF	OPO Laser Alignment Facilities
OLAP	On-Line Analytical Processing
OLCI	Ocean and Land Color Instrument
OLI	Operational Land Imager
OLI-2	Operational Land Imager-2
OLS	Ordinary Least Square
OLTWG	Old Landsat Technical Working Group
OM	Operations and Maintenance
OMA	Oblique Mercator Type A
OMB	Office of Management and Budget or Oblique Mercator Type B
OMF	Order Metadata File
OMI	Ozone Monitoring Instrument
OMP	Operations Management Plan
OMS	Optimum Management System
ONR	Office of Naval Research
OO	Orbit Oriented
OOB	Out-of-Band
OPA	Organizational Process Asset
OPeNDAP	Open-Source Project for Network Data Access Protocol
OPM	Office of Personnel Management
OPM3	Organizational Management Maturity Model
OPO	Optical Parameter Oscillator
OPR	Office of Primary Responsibility
OPS	Operations
Ops Con	Operations Concept
Ops GUI	Operations Graphical User Interface
OQPSK	Offset Quadrature Phase Shift Keying
OR	Operations Readiness Oracle Reduction
ORB	Object Request Broker Ocean Radar Backscatter
ORC	Optimized Row Columnar
ORE	Operations Readiness Exercise
OREO	Operational Readiness Exercises and Observations
ORIT	Oracle Reduction Integation and Test
ORR	Operations Readiness Review
ORST	Oracle Reductioin System Test
ORT	Operational Readiness Test
OS	Operating System OLI-2 Simulator
OSAM	On-Orbit Servicing, Assembly and Manufacturing
OSB	Observatory System Branch
OSC	Orbital Science Corporation
OSD	Object Storage Device
OSHA	Occupational Safety and Health Administration
OSI	Open Systems Interconnection
OSS	Object Storage Server Operations Support Simulations Open Source Software
OSSMA	Office of Systems Safety and Mission Assurance
OST	Object Storage Target
OSTP	Office of Science and Technology Policy
OTB	Over Target Baseline
OTF	Optical Transfer Function OLI Test Facility On The Fly
OTS	OLI-TIRS Subsetter Over Target Schedule Off-The-Shelf
OU	Organizational Unit
OUI	Operator User Interface
OV	Operational Verification
OV-1	Operational View 1
OVA	Operations Validation and Acceptance
OVAD	Operational Verification Acceptance Document
OVAP	Operational Verification Acceptance Period
OWASP	Open Web Application Security Project
OWB	Oracle Warehouse Browser Oracle Warehouse Builder
OWSGUI	Oracle Web Service GUI

P&C	Project Management and Controls
P&S	Planning and Scheduling
P/D	Programmable Demodulator
P/N	Part Number
P/P	Patch Panel
P3I	Preplanned Product Improvement
PaaS	Platform as a Service
PAC	Partial Aperture Calibrator Prince Albert, Canada Ground Station
PACE	Plankton, Aerosol, Cloud, Ocean Ecosystem
PACI	Payload and Attitude Control Interface
PAIV	Project Acceptance and Implementation Variance
PALMA	Portfolio Analysis Machine
PAM	Pluggable Authentication Module
PAN	Production Acceptance Notification Panchromatic
PAP	Primary Archive Program
PAPH	Pseudo-Average Pulse Height
PAPL	Project Approved Parts List
PAR	Post-Assessment Report
PASC	Partial Aperture Solar Calibrator
PB	Playback or Petabyte
PBL	Project Baseline Log
PBS	Project Breakdown Structure
PBTLM	PB X-Band Housekeeping Telemetry
PC	Personal Computer Polyconic Production Control Program Charter Property Clerk
PCA	Physical Configuration Audit Physical Channel Access Point of Closest Approach
Pcache	Processing Cache
PCB	Parts Control Board Project Control Board Product Control Board
PCD	Payload Correction Data
PCDS	Payload Correction Data Subsystem
PCI	Peripheral Component Interface Peripheral Component Interconnect
PCI-E or PCIe	Peripheral Component Interconnect Express
PCI-X	Peripheral Component Interconnect Extended
PCM	Pulse Code Modulation
PCP	Parts Control Plan
PCR	Project Closeout Review
PCRE	Perl Compatible Regular Expression
PCS	Process Control Subsystem Product Control Subsystem Production Control Subsystem
PCSS	Program Coordinate Systems Standards
PCTUN	Percent Uncertainty
PCU	Power Control Unit
PD	Product Distribution Position Description Program Directive
PDA	Personal Digital Assistant
PDB	Program Decision Board Project Database
PDD	Presidential Decision Directive
PDE	Propulsion Drive Electronics
PDF	Portable Document Format Payload Data Formatter
PDI	Product Delivery Interface
PDL	Product Design Lead
PDM	Precedence Diagramming Method
PDPS	Planning and Data Processing Segment
PDR	Product Delivery Record Preliminary Design Review
PDRD	Product Delivery Record Discrepancy
PDRM	Product Delivery Receipt Mechanism
PDS	Product Distribution System
PDU	Protocol Data Unit Power Distribution Unit
PE	Proficiency Exercises
PED	Personal Electronic Device Portable Electronic Device
PER	Performance Evaluation Review Pre-Environmental Review
PERT	Program Evaluation and Review Technique
PF	Polarization Factor
PF1	Poker Flats 1
PFPA	Prime Focal Plane Assembly
PFR	Problem / Failure Report
PFS	Product Functional Specification
PG	Product Generation
PgC	Program Charter
PGE	Product Generation Element
PgIMS	Program Integrated Master Schedule
PgMP	Program Management Plan
PGN	Polar Ground Network
PGS	Product Generation System (Generic Name for NLAPS) Product Generation Subsystem
PgWBS	Program Work Breakdown Structure
PHA	Preliminary Hazard Analysis
PHP	Hypertext Preprocessor
PI	Primary Investigator Principal Investigator
PIA	Project Implementation Agreement Privacy Impact Assessment
PIB	Payload Interface Board
PICS	Pseudo-Invariant Calibration Site Planetary Image Cartography System
PID	Process Identification
PIE	Payload Interface Electronics
PII	Personally Identifiable Information
PIL	Parts Identification List
PIMS	Project Integrated Master Schedule
PIP	Premium Internet Protocol
PITL	Pass-In-The-Life
PIV	Personal Identity Verification
PIXELQA	Pixel Quality Assessment
PKI	Public Key Infrastructure
PKO	Project Kick-Off
PL	Public Law
PL-DRO	Phase-Locked Dielectric Resonance Oscillator
PL/SQL	Procedural Language / Structured Query Language
PLA	Payload Adapter
PLAR	Postlaunch Assessment Review
PLRA	Program Level Requirements Agreement Program Level Requirements Appendix
PM	Phase Modulation Program Management Project Management
PMB	Performance Measurement Baseline
PMBOK	Project Management Book Of Knowledge
PMC	Performance Monitoring Counter Program Management Council Payload Mode Control
PMEF	Primary Mission Essential Function
PMI	Project Management Institute
PMMM	Program Management Maturity Model
PMO	Persistent Mission Object Portfolio Management Office
PMP	Project Management Professional Project Management Plan Procurement Management Plan
PMPDR	Physical Media Product Delivery Record
PMPDRD	Physical Media PDR Discrepancy
PMRT	Post-Mission Readiness Testing
PMSC	Program Management Systems Committee
PMSEIT	Program Management, Systems Engineering, and Integration and Test
PMT	Performance Measurement Technique
PN	Pseudorandom Noise or Pseudo-Noise
PNG	Portable Network Graphics
PNTR	Pointer
PO	Project Owner Purchase Order
POA&M	Plan of Action and Milestones
POC	Point of Contact
POJO	Plain Old Java Object
POL	Policy Polarimetric Radar
POLSA	Polska Agencja Kosmiczna (Polish Space Agency)
POP	Point-Of-Presence Point of Performance Period of Performance
POS	Position and Orientation System
POSC	Petrotechnical Open Software Corporation
POSIX	Portable Operating System Interface for Unix
POT	Product Order Tables
PP	Planning Package Pull-Pin
PPF	Payload Processing Facility
PPL	Preferred Parts List
PPM	Program Project Management
ppm	Parts Per Million
PPOC	Procurement Point of Contact
PPP	Project Protection Plan
PPQA	Process and Product Quality Assurance
PPR	Post-Pass Report
PPROC	Post-Processing
PPS	Pulse Per Second
PPT	Proficiency Pass Training
PQ	Pixel Quality
PQA	Palm Query Application
PR	Program Review Problem Report Product Request Purchase Request
PRA	Paperwork Reduction Act Probabilistic Risk Assessment
PRB	Problem Report Message
PRD	Project Reference Database
PRDS	Project Reference Database System
PRI	Priority Mask Message
PRISM	Professional Resources in Information Systems Management Parameter-elevation Regressions on Independent Slopes Model
PRL	Pull Remote Logs
PRN	Pseudorandom Noise Pattern
PRNU	Photo Response Non-uniformity
PROD	Production
PROM	Programmable Read-Only Memory
PROP	Propulsion
PS	Polar Stereographic Production Server
P_s	Probability of Mission Success
PSA	Pre-Security Assessment
PSD	Power Spectral Density
PSF	Point Spread Function
PSG	Pull and Send GPR
PSGUI	Production Server Graphical User Interface
PSHSCCSS	Percent Slope, Hillshade, Cloud, Cloud Shadow, and Snow
PSI	PCS Startup IAS
PSK	Phase Shift Keyed
PSLA	Project Service Level Agreement
PSM	Project Safety Manager
PSMON	Power Status Monitor
PSR	Priority/Service Request Mask File Preship Review Preshipment Review Program Status Review
PSS	Pull and Send SSOH
PSU	Power Supply Unit
PSW1	Partial Surface Water 1
PTA	Post-Test Analysis
PTM	Principal Task Manager
PTP	Primary Transfer Program Programmable Telemetry Processor
PTR	Post-Test Review
PTS	Project Task Structure
PUB	Publication
PUP	Perfectly Uniform Pitch
PV	Planned Value
PVCS	Polytron Version Control System
PVL	Parameter Value Language
PWA	Printed Wire Assembly
PWB	Printed Wiring Board
PWBS	Project Work Breakdown Structure
PWC	PCS Work Order Controller
PWG	PCS Work Order Generator
PWL	PCS Work Order Scheduler Lite
PWS	Project Website PCS Work Order Scheduler
PWSL	Potential Wetland Soil Landscape
PWV	Precipitable Water Vapor
PyCCD	Python-based CCD

Q	Quadrature Channel Quantized Output
Q&A	Quality and Accounting
Q1	Quarter 1
Q1G	L1G Quality Assurance
Q1R	L1R Quality Assurance
Q2	Quarter 2
Q3	Quarter 3
Q4	Quarter 4
QA	Quality Assurance Quality Assessment
QAA	Quality Assurance Audit
QAS	Quality Assessment Subsystem
QASP	Quality Assurance Surveillance Plan
QB	Quality Board Quality Band
QC	Quality Control
QCM	Quartz Crystal Microbalance
QFS	Quick File System
QMM	Landsat Quarterly Management Meeting
QMP	Quality Management Plan
QMS	Quality Management System
QOCI	Qt Oracle Call Interface
QPSK	Quadrature Phase Shift Keying
QTH	Quartz Tungsten Halogen
QUI	Quality Assurance User Interface
QWIP	Quantum Well Infrared Photometers
QWR	Quarterly Web Review

R&D	Research and Development
R&D	Reference and Validation
R-C	Resistor-Capacitor
R-S	Reed-Solomon
R/T	Receive/Transmit
R0C	A stage of Radiometric Processing; Radiometric Calibration
R0R	A stage of Radiometric Processing; Radiometric Artifacts Collection
R1	Release 1
R1R	A stage of Radiometric Processing; Cosmetic Changes
R2	Release 2
R21	Resource 21
R3	Release 3
R53	Amazon Route 53
RA	Right Ascension Risk Assessment
RAC	Real Application Cluster Risk Assessment Code
RAD	Radiometric Rapid Application Development
RadCalNet	Radiometric Calibration Network
RadCaTS	Radiometric Calibration Test Site
RADSATQA	Radiometric Saturation
RadSim	Radiometry Simulator
RAID	Redundant Array of Independent Disks
RAM	Random Access Memory Responsibility Assignment Matrix Resource Allocation Matrix
RAMP	Radarsat Antarctica Mapping Project
RAS	Reliability, Availability, Serviceability
RASSpy	Radiometry Assessment Python Implementation
RAT	Regression Analysis Test Release Acceptance Test
RBD	Risk Based Decision
RBS	Reflective Band Sensor Risk Breakdown Structure
RBST	Role-Based Security Training
RBV	Return Beam Vidicon
RC	Real Constellation
RCA	Radio Corporation of America
RCA-EO	Requirements, Capabilities, and Analysis for Earth Observations
RCC	Raw Computer Compatible
RCCA	Root Cause and Corrective Action
RCM	Resource Configuration Manager RADARSAT Constellation Mission
RCMAP	Rangeland Condition, Monitoring, Assessment, and Projection
RCN	Revision Control Number
RCR	Remote Controlled Repository
RCS	Reaction Control System Reference Climate Station
RD	Requirements Document
RDA	Research Data Alliance
RDAC	Redundant Disk Array Controller
RDB	Requirements Database Baseline
RDBMS	Related Database Management System
RDC	Remote Desktop Connection
RDCS	Raw Data Capture Subsystem
RDM	Radiation Design Margin
RDPS	Raw Data Processing Subsystem
RDS	Raw Data Subsetter Relational Database Service Remote Desktop Services
RDSS	RCC Data Subsetter Raw Data Subsetting Subsystem
RE	Requirements Engineer and Responsible Engineer
REC	Recovery Time
REF	Reference
REL	Relative
REQ	Service Request Message Requirement
RER	Relative Edge Response
REST	Representational State Transfer
REVCM	Revised Cloud Mask
RF	Radio Frequency
RFA	Request for Action
RFC	Request for Comments
RFI	Request for Information
RFID	Root File Identification Radio-Frequency Identification
RFO	Request for Offer
RFP	Request for Proposal
RFQ	Request for Quote
RFR	Request for Record Run for Record
RFS	Radio Frequency System
RG	Relative Gain
RGAC	RADARSAT-1 Global Archive Consolidation
RGB	Red Green and Blue Color Value
RGE	Research Grade Evaluation
RH	Red-High or Right Hand
RHC	Right-Hand Circular
RHCP	Right-Hand Circularly Polarized
RHEL	Red Hat Enterprise Linux
RHORC	Rayleigh-corrected Reflectance
RHS	Right-Hand Side Right-Hand SLO
RHSS	RHEL Satellite Server
RIDS	Review Item Discrepancies
RIM	Risk Information Management Tool
RIO	Risks, Issues, and Opportunities
RIPL	Risk Identification Prompt List
RIRLS	Robust Iteratively Reweighted Least Squares
RIS24	24-bit Raster Image
RIT	Rochester Institute of Technology
RITSO	Regional IT Security Officer
RL	Red-Low
RLN	Resource Load Network
RLUT	Response Linearization Look-Up Table
RM	Requirements Management Risk Manager or Resource Manager
RMAN	Recovery Manager
RMAP	Remote Memory Access Protocol
RMB	Risk Management Board
RMD	Risk Management Database
RMF	Risk Management Framework
RMM	Risk Mitigation Maneuvers
RMP	Requirements Management Plan Risk Management Plan
RMR	Risk Management Record
RMS	Root Mean Square or Risk Management System
RMSE	Root Mean Square Error
RMSEr	Radial Root Mean Square Error
RMT	Risk Management Tool
RN	Random Noise
RO	Receiving Officer
ROC	Real-Time Operations Console
ROI	Return on Investment Region of Interest
ROIC	Read-Out Integrated Circuit
ROLO	Robotic Lunar Observatory
ROM	Rough Order of Magnitude
ROS	Relative Operational Sequence
ROSCOSMOS	Russian Space Agency
ROSHYDROMET	Russian Federal Service for Hydrometeorology and Environmental Monitoring
RPC	Remote Procedure Call Rational Polynomial Coefficient
RPE	Rational Publishing Engine
RPI	Rumpin, Indonesia Ground Station
RPM	Revolutions per Minute RPM Package Manager
RPS	Radiometric Processing Subsystem
RR	Readiness Review
RRAS	Routing and Remote Access Services
RRB	Reduced Resolution Browse
R_rs	Remote Sensing Reflectance
RSA	Rivest-Shamir-Adleman
RSB	Remote Sensing Branch
RSD	Remote Sensing Division
RSDO	Rapid Spacecraft Development Office
RSDP	Rapid Spacecraft Development Office
RSP	Real-Time Science Processing
RSPP	Robotic System Protection Plan
RSR	Relative Spectral Responses
RSS	Reuse Subsystem Really Simple Syndication Rich Site Summary Root Sum Square
RST	Remote Sensing Technologies
RT	Real Time or Radiative Transfer
RTA	Roof Top Antenna
RTC	Remote Telemetry and Command Unit Remote Telemetry Command
RTCS	Relative Time Command Sequence
RTF	Rich Text Format
RTK	Real-Time Kinematic
RTO	Real Time Operations
RtoO	Research-to-Development-to-Operations
RTS	Relative Time Sequence
RTT	Round Trip Time
RTTM	Requirements-To-Test Matrix
RTTOV	Radiative Transfer (RT) for Television InfraRed Observation Satellite (TIROS) Operational Vertical Sounder (TOVS)
RVM	Requirements Verification Matrix
RVPN	Railroad Valley Playa
RWA	Reaction Wheel Assembly
RWOC	Radiometric Work Order Common
RX	Receive

S&O	Search and Order
S&CMP	Stakeholder & Communications Management Plan
S-NPP	Suomi National Polar-Orbiting Partnership
S/C	Spacecraft
S/T	Straight-Through
S/W	Software
S2	Sentinel-2
S2QWG	Sentinel-2 Quality Working Group
S2VT	Sentinel-2 Validation Team
S3	Amazon Simple Storage Service
SA	Spacecraft Analyst Single Access Systems Administrator Storage and Archive Subsystem System Architect
SA-AC	Storage Archive – Archive Cache
SA-IC	Storage and Archive – Internal Cache
SA-PC	Storage Archive – Processing Cache
SAA	South Atlantic Anomaly Solar Azimuth Angle
SaaS	Software as a Service
SAC	Satellite Application Centre (South Africa)
SADA	Solar Array Drive Assembly
SADD	System Algorithm Description Document
SAFe	Scaled Agile Framework
SAG	System Administrator Guide
SAGUI	Storage and Archive Graphical User Interface
SAIC	Science Applications International Corporation
SAM	Scan Angle Monitor Storage Archive Manager
SAML	Security Assertion Markup Language
SAMP	Software Acquisition Management Plan
SAN	Storage Area Network
SanDiA	Sankey Diagram Application
SANS	System Administration, Networking, and Security Institute
SANSA	South African National Space Agency
SAP	Systems Applications and Products Software Assurance Plan
SAPMSO	Space Asset Protection Mission Support Office
SAR	Synthetic Aperture Radar Spacecraft Acceptance Review
SARF	System Access Request Form
SARR	Security Assessment Response Report
SAS	Serial Attached SCSI Solar Array Simulator
SASS	Syntactically Awesome Style Sheets
SAT	Site Acceptance Testing
SATA	Serial Advanced Technology Attachment
SatAPI	Satellite Application Programming Interface
SATO	Science Algorithms to Operations
SAVI	Soil Adjusted Vegetation Index
SAW	Systems Analysis Workgroup
SAWG	Software Assurance Working Group
SB	SoftBench Simulator
SBA	Societal Benefit Area
SBAF	Spectral Band Adjustment Factor
SBC	Single Board Computer
SBCG	System Build and Configuration Guide
SBG	Software Build Guide Surface Biology and Geology
SBM	Serena Business Manager Solutions Business Manager
SBRS	Santa Barbara Remote Sensing
SBS	Subsetter System
SBU	Sensitive But Unclassified
SC	Spacecraft or Science Campaign
SC-GND	Spacecraft to Ground
SCA	Sensor Chip Assembly Snow Covered Area Security Configuration Assessment Static Code Analyzer
SCAMA	Switching, Conferencing, and Monitoring Arrangement Station Conferencing and Monitoring Assembly
SCAN	Soil Climate Analysis Network
SCB	Schedule Control Board
SCC	Stress Corrosion Cracking System Control Center Station Control Computer
SCD	Small Conversion Device
SCDR	Spacecraft Critical Design Review
SCES	Station Contact Execution Summary
SCH	Contact Schedule Message
SCI	Software Configuration Item
SCID	Spacecraft Identifier
SCL	Signal Conditioning Unit - Lower Equipment Module
SCLAST	Time Since Last Change
SCM	Software Configuration Management Shared Container Migration
SCMAG	Change Magnitude
SCMP	Software Configuration Management Plan
SCMQA	Spectral Model Quality
SCN	Scan
SCP	Standard Controls Processor Secure Copy Protocol
SCR	System Concept Review Software Configuration Request Standard Collection Request Special Collection Request Satellite Cross-calibration Radiometer
SCRC	Special Collection Request Cancellation
SCRIL	Smart Card Required for Interactive Login
SCRU	Special Collection Request Update
SCS	Scan-Correlated Shift Satellite Checkout Station NOAA/IPO Space and Communications Segment
SCSS	Sass Cascading Style Sheets
SCSI	Small Computer Software Interface
SCSTAB	Spectral Stability Period
SCTIME	Time of Spectral Change
SCTR	Special Calibration Test Requirements
SD	South Dakota or Scan Direction
SDAT	Special Data Acquisition Tool
SDAV	Spatial Data Analysis & Visualization
SDB	Satellite-derived Bathymetry
SDCG	Space Data Coordination Group
SDD	Software Design Document Station Description Document
SDDS	Seamless Data Distribution System
SDF	Software Development File
SDG	Sustainable Development Goals
SDK	Software Development Kit
SDLC	System Development Life Cycle Software Development Life Cycle
SDLT	Super DLT
SDM	Silo Data Manager
SDMP	Software Development Management Plan
SDN	South Dakota Network
SDP	Software Development Plan Science Data Production Science Data Processing
SDP&I	Science Data Processing and Infrastructure
SDPE	Science Data Processing and Engineering
SDPS	Support Data Processing Subsystem Science Data Processing Segment
SDR	System Design Review or Software-defined Radio
SDRAM	Synchronous Dynamic Random Access Memory
SDS	Scientific Data Set Space Defense Squadron
SDU	Service Data Unit
SDVF	Software Development and Validation Facility Spacecraft Development Verification Facility
SDW	Seamless Data Warehouse
SE	Systems Engineer Systems Engineering
SEA	Sensor Azimuth Angle
SeaDAS	Sea-viewing Wide Field-of-View Sensor Data Analysis System
SeaWiFS	Sea-viewing Wide Field-of-View Sensor
SEB	Source Evaluation Board
SEBAL	Surface Energy Balance Algorithm for Land
SED	Software Engineering Department Stream Editor
SEE	Single-Event Effect or Science Execution Environment Software Engineering Environment
SEFI	Single Event Functional Interrupt
SEI	Software Engineering Institute
SEIT	System Engineer Integration and Test
SEL	Single-Event Latchup or Software Engineer Lead
SELC	System Engineering Lifecycle
SelfDef	Self-Defining CMDA format
SEM	Security Engineered Machine
SEMP	Systems Engineering Management Plan
SEO	Systems Engineering Office
SES	Schedule and Exchange System
SET	Systems Engineering Team
SETA	Systems Engineering and Technical Assistance
SEU	Single-Event Upset – Anomaly Event
SEV	Severity or Sun-Earth-Vehicle angle
SEWP	Solutions for Enterprise-Wide Procurement
SEZ	Sensor Zenith Angle
SF	Service Framework
SFBME	Short-Form Brouwer Mean Element
SFC	Scene Framing Component
SFCG	Space Frequency Coordination Group
SFFT	Short-Form Functionality Testing
SfM	Structure from Motion
SFT	SIFMT File Transfer
SFTP	SSH File Transfer Protocol
Sg/SG6	Svalbard Ground Station
SG1	Svalbard, Norway
SGDAWG	Space to Ground Data Acquisition Working Group
SGI	Silicon Graphics Incorporated Shadnagar, India Ground Station
SGICD	Space to Ground Interface Control Document
SGLT	Space to Ground Link Terminal
SGO	Satellite and Ground Systems Operations
SGP4	Simplified General Perturbations
SGS	Svalbard Ground Station Svalsat Ground Station
SGT	Stinger Ghaffarian Technologies
SH	Southern Hemisphere
SHA	Secure Hash Algorithm
Shapelib	Shapefile Library
SHC	Shutter Histogram Characterization
SHS	Second Half Scan
SHSERR	Second Half Scan Error
SI	Searchable Inventory Space Imaging Science Instrument International System of Units Système International or Spectral Indices
SIAT	Spectral Image Annotation Tape
SIC	Spacecraft Identifier Code
SID	Searchable Inventory Database or System ID
SIDECAR	System for Image Digitization Enhancement Control and Retrieval
SIEM	Security Information and Event Management
SIFMT	Scene to Interval to File Mapping Table
SIG	Signaling
SIP	Standard Internet Protocol
SiPIN	Silicon PIN
SIPS	Science Investigation Processing System
SIR	Scientific Investigations & Research Survey Investigation and Research or System Integration Review
SIRCUS	Spectral Irradiance and Radiance Responsivity Calibration Using Uniform Sources
SIRD	Satellite Instrument Requirements Document
SIRU	Scalable Inertial Reference Unit
SIS	Science Information System Spacecraft Interface Simulator Spherical Integrating Sources
SISO	Subsystem Information System Owner
SISSE	Senior Information System Security Engineer
SIT	Strategic Implementation Team
SITL	Single Interval-In-The-Life
SITP	Software Integration Test Plan
SKMP	System Key Management Plan
SL	Scan Line or Stim Lamp
SLA	Service Level Agreement Scan Line Artifact
SLAM	Storage Location Allocation Manager
SLAT	Spacecraft Location and Attitude Tape
SLATE	System Level Automation Tool for Enterprises
SLC	Scan Line Corrector Software Development Life Cycle
SLD	Scan Line Data
SLI	Sustainable Land Imaging
SLL	Scan Line Length
SLO	Scan Line Offset
SLOC	Standard Lines of Code
SLP	Service Location Protocol
SLPP	Summary Level Planning Package
SLS	Scan Line Start
SLSTR	Sea and Land Surface Temperature Radiometer
SLT	Senior Leadership Team
SM	Schedule Manager Scan Mirror
SM RVM	Science and Mission Requirements Verification Matrix
SMA	Safety and Mission Assurance S-Band Multiple Access Semi-Major Axis
SMACAA	SDSU MODTRAN Atmospheric Correction Anytime Anywhere
SMAP	Safety and Mission Assurance Plan
SMART	Space-based Machine Automated Recognition Technique
SMAT	System, Model, and Analysis Tool
SMC	Subsetter Monitor and Controllers
SMD	Stored Mission Data Science Mission Directorate
SME	Scan Mirror Electronics Subject Matter Expert
SMP	Software Maintenance Plan Software Management Plan
SMR	Staff Management Request
SMRD	Science and Mission Requirements Document Spacecraft Mission Requirements Document
SMS	System Management Server Science Modeling System
SMSR	Safety and Mission Success Review
SMTF	Sync Marked Transfer Frame
SMTP	Simple Mail Transfer Protocol
SN	Space Network
SNAS	Space Network Access System
SNMP	Simple Network Management Protocol
SNO	Simultaneous Nadir Overpass
SNR	Signal-to-Noise Ratio
SNS	Simple Notification Service
SNSA	Swedish National Space Agency
SNUG	Space Network Users' Guide
SNWG	Satellite Needs Working Group
SO	Search and Order
SOA	Service-Oriented Architecture Satellite Operator Agency
SOAP	Simple Object Access Protocol
SOC	Satellite Operations Center
SOCC	Satellite Operations Control Center
SOD	Seconds Of Day
SOH	State of Health
SOM	Space Oblique Mercator
SOMA	Scanning Order Management Application
SON	Statement of Need
SOO	Statement of Objectives
SOP	Standard Operating Procedure
SORN	System of Record Notice
SOS or S/OS	Spacecraft/Observatory Simulator
SOW	Statement of Work
SP	Special Publication
SPA	Science Processing Algorithm
SPAM	Spatial Production Allocation Model SpaceWire Access Memory
SPAOS	Standard Product Automatic Ordering System
SPARC	Scalable Processor Architecture
SPDR	Spacecraft Preliminary Design Review
SPI	Schedule Performance Index
SPIE	International Society for Optics and Photonics
SPIM	SPOT Image
SPIT	Systems Performance Improvement Team
SPITL	Scheduling Period In The Life
SPL	Software Project Lead
SPOC	Service-Oriented Architecture (SOA) Proof of Concept or Security Point of Contact
SPOF	Single Point of Failure
SPOT	Satellite Pour l'Observation de la Terre (Satellite for Earth Observation)
SPR	Software Problem Report
SPS	Science Product System SID Population Service
SPSR	System Preship Review
SPT	Science Processing Toolkit
SPT VDI	Science Processing Toolkit Virtual Desktop Infrastructure
SPVM	System Performance Verification Matrix
SPVP	System Performance Verification Plan
SQA	Software Quality Assurance
SQAP	Software Quality Assurance Plan
SQL	Structured Query Language
SQMS	Software Quality Management System
SQPSK	Staggered Quadrature Phase Shift Keying
SQRT	Square Root
SQS	Amazon Simple Queue Service
SR	System Review Surface Reflectance
sr	Steradian
SRAEROSOLQA	Internal Surface Reflectance Aerosol Quality Assessment
SRAM	Static Random Access Memory
SRB	Schedule Review Board Standing Review Board
SRCLOUDQA	Surface Reflectance Quality Assessment Band
SRD	System Requirements Document
SRE	Site Reliability Engineering
SRI	Standard Robot Interface
SRLUT	Spectral Radiance Look-Up Table
SRF	Spectral Response Function
SRI	Summation Research, Inc.
SRIX4Veg	Surface Reflectance Intercomparison eXercise for Vegetation
SRM	Silo Resource Manager
SRO	Systems Review Office
SRP	Systems Review Plan
SRR	System Readiness Review System Requirements Review Software Requirements Review
SRS	Software Requirements Specification System Requirements Specification
SRT	Systems Review Team Si Racha, Thailand Ground Station
SRTM	Software Requirements Traceability Matrix Shuttle Radar Topography Mission
SRV	SUBETTER_REQUEST_View
SS	Space Segment or System Support Signal Strength or Steady State
SSA	S-Band Single Access Space Situational Awareness
SSAI	Science Systems and Applications, Inc
SSC	Software Security Center
SSCL	Standard System Control List
SSD	Subsystem Design Document Solid State Drive
SSDLC	Secure Software Development Life Cycle
SSE	Subsystem Engineer
SSEB	Simplified Surface Energy Balance
SSEBop	Operational Simplified Surface Energy Balance
SSERB	Systems Support Engineering Review Board
SSG	System Support Group
SSH	Secure Shell
SSHGS	Secure Shell Gateway Service
SSI	Sensitive Security Information Spectral Sampling Interval Superspectral Imager
SSIP	System Safety Implementation Plan
SSL	Secure Socket Layer
SSM	Scene Select Mechanism Scene Select Mirror Amazon Systems Manager
SSO	Single Sign-On
SSoH	Stored State of Health
SSOP	Security Standard Operating Procedure
SSP	System Security Plan Satellite Support Plan
SSP-MSO	Space System Protection - Mission Support Office
SSPA	Solid State Power Amplifier
SSPP	Systems Safety Program Plan
SSR	Solid State Recorder Software Specification Review
SSRR	Spacecraft System Requirements Review
SSSC	Science Support Services Contract
SSURGO	NRCS Soil Survey Geographic Database
ST	System Test or Surface Temperature
STAC	SpatioTemporal Asset Catalog
STARFM	Spatial and Temporal Adaptive Reflectance Fusion Model
STARS	Satellite Telemetry Automatic Reduction System
STC	System Test Case
STD	Standard
STDEV	Standard Deviation
STDMP	Simulated and Test Data Management Plan
STDN	Spaceflight Tracking and Data Network
STE	System Test Equipment
STESR	System Test Execution Summary Report
STF	System Transfer Function
STIG	Security Technical Implementation Guide
STIM	Stimulus
STIPP	Spatial and Temporal Integrated Probability-based Post-processing
STK	StorageTek Systems Toolkit
STOL	System Test and Operations Language
STP	System Test Plan
STQA	Surface Temperature Quality Assessment
STR	System Test Report Special Task Report
STS	Scene Transmit Schedule Security Token Service
STSOC	System Test and Operations Language
STSS	Synchronize to Secondary Server
STV	Spacecraft Transportation Vehicle
SUI	Subsetter Operator User Interface
SUM	Summary
SUMM	Software User and Maintenance Manual
SUN	Sun Microsystems, Inc.
SURFRAD	Surface Radiation Surface Radiation Budget Network
SUROM	Start-Up Read-Only Memory
SV	Space Vehicle, Schedule Variance, or Subversion
SvalSat	Svalbard Satellite Station
SVN	Sun-Vehicle-Normal angle or Subversion
SVT	Site Verification Test
SVVP	System Verification and Validation Plan
SW	Switch Software
SWAP	Size, Weight, and Power
SWD	Software Development
SWE	Software Engineer
SWG	Simulator Working Group Standards Working Group
SWIR	Short Wavelength Infrared Shortwave Infrared
SWOT	Strength, Weakness, Opportunity, and Threat Surface Water and Ocean Topography
SYS	Systems
SZA	Solar Zenith Angle

T	Temperature
T&A	Trending and Analysis Trending & Archive
T&C	Telemetry and Command
T&E	Testing and Evaluation
T/V	Thermal/Vacuum
T1	Tower 1 Tier 1
T2	Tower 2 Tier 2
T382	Triangular 382
Ta	Maximum daily air temperature
TAA	Technical Assistance Agreement
TAI	International Atomic Time
TAM	Three-Axis Magnetometer
TAMR	Telemetry Archive Metrics Report
TAP	Technical Assessment Panel Time-series Analysis and Plotting
TAR	Tape Archiver
TAT	Turn-Around-Time
TAYF	Test As You Fly
TB	Terabyte
TBC	To Be Confirmed
TBD	To Be Determined
TBDEM	Topobathymetric Digital Elevation Model
TBR	To Be Resolved To Be Reviewed To Be Refined
TBS	To Be Submitted To Be Supplied To Be Specified To Be Scheduled
TC	Test Case Test Conductor Thermal Control Tasseled Cap
TC0AOS	TIRS Collection 0 Automatic Ordering System
TC1AOS	TIRS Collection 1 Automatic Ordering System
TCA	Time of Closest Approach
TCDC	Total Cloud Cover
TCO	Total Cost of Ownership
TCP	Transmission Control Protocol Technology Control Plan
TCP/IP	Transmission Control Protocol/Internet Protocol
TCPI	To Complete Performance Index
TCS	Thermal Control Subsystem
TCXO	Temperature-Compensated Crystal Oscillator
TD	Test Director
TDB	Barycentric Dynamical Time
TDEA	Triple Data Encryption Algorithm
TDF	Tracking Data Formatter Time-Dependent Factor
TDG	Test Data Generator
TDI	Time Delay Integration
TDMS	Technical Data Management System
TDR	Test Discrepancy Report Trusted Digital Repository
TDRS	Tracking and Data Relay Satellite
TDRSS	Tracking and Data Relay Satellite System
TDT	Terrestrial Dynamical Time
TDWG	Test Dataset Working Group
TDY	Temporary Duty
TE	Test Engineer
TEM	Technical Exchange Meeting
TERSS	Tasmanian Earth Resources Satellite Station Consortium
TES	Thermal-Emissivity Separation
TESR	Test Execution Summary Report
TFA	Two-Factor Authentication
TFDH	Telemetry Frame Delivery Header
TFF	TIRS Free Flyer
TGS	Tile Generation System
tHC	The Hammers Company
TIC	Trusted Internet Connection
TICD	Thermal Interface Control Document
TID	Total Ionizing Dose
TIFF	Tagged Image File Format
TIM	Technical Interchange Meeting Technical Issue Memorandum Thermal Infrared Module
TIPCE	TIRS-2 Image Performance and Cryogenic Evaluation
TIR	Thermal Infrared
TIROS	Television InfraRed Observation Satellite
TIRS	Thermal Infrared Sensor Thermal Infrared Scanner
TIRS-2	Thermal Infrared Sensor -2
TIS	Thermal Infrared Sensor TIRS Interface Simulator Teledyne Imaging Sensor Corp.
TIU	Tape Interface Unit
TL8AOS	TIRS Landsat 8 Automatic Ordering System
TL8CAOS	TIRS Landsat 8 Collection Automatic Ordering System
TLE	Two-Line Element
TLM	Telemetry
TLS	Transport Layer Security
TM	Thematic Mapper Traverse Mercator Task Manager Test Modulator
TM-A	Thematic Mapper - Archive Format
TM-R	Thematic Mapper - Raw Format
TMACS	Thematic Mapper and Multispectral Scanner Archive Conversion System
Tmask	Time-series Mask multiTemporal Mask
TMIAS	Thematic Mapper Image Assessment System
TML	Total Mass Loss
TMON	Telemetry Monitor
TMR	Thermal Mapper Raw
TMS	Training Management System
TMSCAG	Thematic Mapper-based Fractional Snow Cover and Grain Size
TMSG	Terrain Mapping Subgroup
TMSR	TSSC Monthly Status Report
TMSS	TM Subsetter
TnB	Thumbnail Browse
TNOC	Tromso Network Operations Center
TNOS	Tromso Network Operations Centre
TNS	Transport Network Substrate
TO	Task Order Terrain Occlusion
TOA	Top of Atmosphere
TOA BT	Top of Atmosphere Brightness Temperature
TOAR	Top of Atmosphere Reflectance
TOMS	Total Ozone Mapping Spectrometer
TOMS-EP	Total Ozone Mapping Spectrometer-Earth Probe
TOR	Terms of Reference
TOV	TIROS Operational Vertical Sounder
TP	Task Plan or Trimmed Pass
TPIO	Technology, Planning and Integration for Observation
TPL	Telemetry Packetization Layer
TPM	Technical Performance Measures
TPS	Test Procedure Specification
TPU	Total Propagated Uncertainty
TQCM	Thermoelectric Quartz Crystal Microbalance
TRAD	Thermal Radiance Layer
TRAM	Tracking, Routing, and Metrics
TRAMAOS	Tracking, Routing, and Metrics Automatic Ordering System
TRD	Technical Requirements Document
TREES	Tropical Ecosystem Environment Observations by Satellite
TRN	Technical Redirection Notice
TRR	Test Readiness Review
TRT	Transition Readiness Test
TS	TIRS-2 Simulator
TSI	Honeywell Technology Solutions Inc.
TSR	Technical Service Request
TSSC	Technical Support Services Contract
TST	Technical Support Team
Tsync	T-Interface Synchronization
TT	Terrestrial Time
TT&C	Telemetry, Tracking, and Control
TT&E	Test, Training, and Exercise
TTF	TIRS Test Facility
TTL	Transistor-Transistor Logic
TTMS	TSSC Task Management System
TTOR	Transition To Operations Review
TTPs	Tactics, Techniques, and Procedures
TURFTS	TDRS Users RF Test Set
TUTR	Tunable Universal Track Receiver
TÜBITAK	Scientific and Technological Research Council of Turkey
TVAC	Thermal Vacuum
Tw//DTW	Time-Weighted Dynamic Time Warping
TWITL	Total WRS-2 in the Life
TWM	Task and Work Management
TWTA	Traveling-Wave Tube Amplifier
TX	Transmit

U/C	Up Converter
U/L	Uplink
U/P	Uplink Processor
UAC	User Account Control
UAE	United Arab Emirates
UAF	University of Alaska, Fairbanks
UAR	Update as Required
UAS	Unmanned Aerial System Uncrewed Aerial System
UB	Undistributed Budget
UDI	Uplink Downlink
UDM	Unusable Data Mask
UDP	Upper Data Point User Datagram Protocol
UDT	UDP Data Transfer
UG	User's Guide
uhd	User's Home Directory
UI	User Interface
UIC	User Interface Compile
UID	Unique Identifier
UINT8	8-bit Unsigned Integer
UIS	USGS Inventory Server
UKSA	United Kingdom Space Agency
UL	Upper Left
ULA	United Launch Alliance
ULC	Update LGN Cache
UM	Unified Messaging
UML	Unified Modeling Language
UNEP	United Nations Environment Programme
UNESCO	United Nations Educational, Scientific and Cultural Organization
UNIX	Bell Laboratories trademark for operating system language and time sharing
unixODBC	Unix Open Database Connectivity
UNOOSA	United Nations Office for Outer Space Affairs
UNT	Unsigned Integer
UP	User Portal System
UPE	User Portal Element
UPS	Uninterruptible Power Supply Universal Polar Stereographic
UPW	User Portal Website
UQPSK	Unbalanced Quadrature Phase Shift Keying
UR	Upper Right User Request
URAD	Upwell Radiance Layer
URI	Uniform Resource Identifier
URL	Uniform Resource Locator
URP	User Request Parameters
URS	User Registration System
US	United States
USAF	United States Air Force
USAID	U.S. Agency for International Development
USB	Universal Serial Bus
USC	United States Code
USDA	U.S. Department of Agriculture
USFS	United States Forest Service
USG	U.S. Government
USGS	U.S. Geological Survey
USML	United States Munitions List
USNO	U.S. Naval Observatory
USPS	U.S. Postal Service
USSF	United States Space Force
USSTRATCOM	U.S. Strategic Command
UT	Universal Time Unit Test
UT1	UTC Corrected
UTC	Universal Time Code Coordinated Universal Time
UTM	Universal Transverse Mercator

V&V	Verification and Validation
VA	Veterans Administration Department of Veterans Affairs
VAA	Viewing Azimuth Angle
VAC	Variance at Completion Volts AC
VAFB	Vandenberg Air Force Base
VAL	Validation
VAP	Value-Added Processor
VAR	Value-Added Resellers Variance Analysis Report
VAST	Vietnam Academy of Science and Technology
VC	Virtual Channel
VC63	Virtual Channel 63
VCA	Virtual Channel Access
VCDU	Virtual Channel Data Unit
VCID	Virtual Channel Identifier Virtual Channel Identification
VCLC	Virtual Channel Link Control
VCM	Vector Covariance Message
VDC	Virtual Data Center Volts Direct Current
VDD	Version Description Document
VDI	Virtual Desktop Infrastructure
VDP	Validation Data Products
VER	Version
VF	Valley Forge
VHRI	Very High-Resolution Imager
VH-RODA	Very High-resolution Radar & Optical Data Assessment
VI	Vegetation Index
VIIRS	Visible Infrared Imager Radiometer Suite
VIS	Visual Information Systems
VisID	Visual Identification
VLAN	Virtual Local Area Network
VLUT	Vendor Look-Up Table
VM	Version Manager
VMM	Virtual Machine Manager
VMS	Virtual Memory Storage
VMVP	Virtual Median Value Point
VNIR	Visible and Near Infrared
VNP09	VIIRS Surface Reflectance
VO	Verification Owner
VOI	Value of Information
VOIP	Voice Over Internet Protocol
VP	Vertical Polarization
VPC	Virtual Port Channel Virtual Private Cloud
VPN	Virtual Private Network
VQA	Visual Quality Assurance
VRM	Verification Requirements Matrix
VRP	Video Reference Pixel
VRS	Vertical Resampling Space
VSD	Volume Size Distribution
VSFB	Vandenberg Space Force Base
VSM	Versity Storage Manager
VSWIR	Visible to Short Wavelength Infrared
VTI	Value Tree Information
VTL	Verification Tracking Log
VTP	Verification Test Procedures
VTW	Value Tree Workbook
VVP	Verification and Validation Plan
VZA	Viewing Zenith Angle

W3C	World Wide Web Consortium
WA	Work Authorization
WAD	Work Authorization Document
WAF	Web Application Firewall
WAN	Wide Area Network
WAO	Work Authorization Order
WB	Wideband
WBDR	Wideband Downlink Report
WBM	Wideband Module
WBS	Work Breakdown Structure
WBV	Wideband Video
WBVT	Wideband Videotape
WC	Worst Case
WCS	Web Coverage Services
WDCD	Wideband Data Capture Device
WELD	Web-Enabled Landsat Data
WFS	Web Feature Services
WG	Working Group
WGClimate	Working Group on Climate
WGCV	Working Group for Calibration and Validation
WGISS	Working Group on Information Systems and Services
WGRIB	Web Gridded Information in Binary Form
WGS	World Geodetic System or Wallops Ground Station
WGS84	World Geodetic System 1984
WGSC	Western Geographic Science Center
WILMA	Wide Long-Term Multi-Satellite Archive
WIP	Work In Progress
WITL	WRS2-In-The-Life Week in the Life
WLS	Weighted Least Square
WMO	World Meteorological Organization
WMS	Web Mapping Services
WMTS	Web Mapping Tile Services
WO	Work Order
WORS	Wallops Orbital Tracking Station
WOTIS	Wallops Orbital Tracking Information Systems
WP	Work Plan or Work Package
WPI	Wetland Potential Index
WPS	Wallops Ground Station
WR	Western Range
WRD	Water Resources Division
WRS	Worldwide Reference System
WRS-2	Worldwide Reference System-2
WRS2TT	Worldwide Reference System-2 to Time Translation
WRS2TTT	Worldwide Reference System-2 to Time Translation Table
WSC	White Sands Complex
WSDL	Web Service Definition Language
WSGI	Web Server Gateway Interface
WSGT	White Sands (NASA) Ground Terminal
WS-I	Web Services Interoperability
WSL	Windows Subsystem for Linux
WVTCS	Wideband Videotape Conversion System
WWW	World Wide Web
WYSIWYG	What You See Is What You Get

XGBoost	eXtreme Gradient Boosting
XIB	Transmitter Interface Board
XML	Extensible Markup Language
XS	Multispectral SPOT Sensor
XSD	XML Schema Definition
XSS	Cross-Site Scripting
XT	Across Track
XTX	X-Band Transmitter

YAML	YAML Ain’t Markup Language Yet Another Markup Language
YGC	Yaw Gyro Compassing
YH	Yellow-High
YL	Yellow-Low
YSF	Yaw Steering Frame
YTD	Year-To-Date

Z	Zulu time (same as GMT)
ZB	Zettabyte
ZFS	Zettabyte File System