What are the processing levels for Landsat Level-1 data?

The table below shows the Landsat Collections Level-1 processing levels:

Landsat Level-1 Processing Levels
Processing Level Description
Terrain Precision Correction (L1TP) Radiometrically calibrated and orthorectified using ground control points (GCPs) and digital elevation model (DEM) data to correct for relief displacement.The highest quality Level-1 products suitable for pixel-level time series analysis. 

GCPs used for L1TP correction are derived from the Global Land Survey 2000 (GLS2000) data set.  

Landsat processing DEM sources include:

Systematic Terrain Correction (L1GT) Radiometrically calibrated with systematic geometric corrections applied using the spacecraft ephemeris data and DEM data to correct for relief displacement. 

Note: L1GT are the highest level of radiometric calibration and systematic correction possible for Landsat 7 and Landsat 8 scenes collected over Antarctica. The L1GT product uses the high-resolution Radarsat Antarctic Mapping Project (RAMP) Version 2 as the elevation correction source.

Geometric Systematic Correction
(L1GS) 
Radiometrically calibration with only systematic geometric corrections applied using the spacecraft ephemeris data.

The processing level is noted in the metadata (.MTL.txt) file that is delivered with each Landsat Level-1 data product (see image below).

 

Example of Landsat Level-1 data product metadata (.MTL.txt) file
GROUP = METADATA_FILE_INFO
    ORIGIN = "Image courtesy of the U.S. Geological Survey"
    REQUEST_ID = "2221601291006_00001"
    LANDSAT_SCENE_ID = "LT50470272010279PAC01"
    LANDSAT_PRODUCT_ID = "LT05_L1TP_047027_20101006_20160512_01_T1"
    COLLECTION_NUMBER = 01
    FILE_DATE = 2016-05-12T13:14:46Z
    STATION_ID = "PAC"
    PROCESSING_SOFTWARE_VERSION = "LPGS_12.8.0"
    DATA_CATEGORY = "NOMINAL"
END_GROUP = METADATA_FILE_INFO
GROUP = PRODUCT_METADATA
    DATA_TYPE = "L1TP"
    DATA_TYPE_L0RP = "TMR_LORP"
    ELEVATION_SOURCE _ "GLS2000"
    OUTPUT_FORMAT = "GEOTIFF"
    EPHEMERIS_TYPE = "DEFINITIVE"
    SPACECRAFT_ID = "LANDSAT_5"
    SENSOR_ID = "TM"
    SENSOR_MODE = "BUMPER"
    WRS_PATH = 047
    WRS_ROW = 027
    DATE_ACQUIRED = 2010-10-06
    SCENE_CENTER_TIME = "18:51:52.31601902"

 

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