Heat Capacity Mapping Mission Data Dictionary

 

Acquisition Date

• Field Definition:  The date the image was acquired.

               Format:
               YYYY/MM/DD
 

Acquisition Time

• Field Definition:  The time of day the image was acquired.
   

Agency Project

• Field Definition:  A NASA satellite that produced thermal maps of the atmosphere and studied dust and liquid droplets in the upper atmosphere. It was also known as AEM-1 from Explorer 58. Agency = NASA / Project = Applications Explorer Mission 1
   

Contrast Range

• Field Definition:  Range of contrast determined for this image
   

Coordinates - Decimal Degrees

• Field Definition:  The latitude and longitude are provided in decimal degrees for the following fields:

                 Values:      
                 Scene Center Latitude and Longitude
                 Northeast (NE) Corner Latitude and Longitude
                 Northwest (NW) Corner Latitude and Longitude
                 Southeast (SE) Corner Latitude and Longitude
                 Southwest (SW) Corner Latitude and Longitude

                 Latitude Format Decimal Degrees: -90.000 through 90.000
                 Longitude Format Decimal Degrees: -180.000 through 180.000

                 Number of decimal places will vary by dataset – check collection in EE.
 

Coordinates - Degrees, Minutes, Seconds

• Field Definition:  The latitude and longitude are provided in degrees, minutes, and seconds for the following fields:

                 Values:
                 Scene Center Latitude and Longitude
                 Northeast (NE) Corner Latitude and Longitude
                 Northwest (NW) Corner Latitude and Longitude
                 Southeast (SE) Corner Latitude and Longitude
                 Southwest (SW) Corner Latitude and Longitude

                Longitude Format:
                DDDMMSS.SSH
                DDD = Degree(s) with a range of 0 through 180
                MM = Minute(s) with a range of 0 through 59
                SS.SS = Second(s) with a range of 0 through 59.99
                H = Hemisphere with E for east and W for west

                Latitude Format:
                DDMMSS.SSH
                DD = Degree(s) with a range of 0 through 90
                MM = Minutes(s) with a range of 0 through 59
                SS.SS = Second(s) with a range of 0 through 59.99
                H = Hemisphere with N for north and S for south
 

Data Set

• Field Definition:  The name applied to this collection: HCMM Digital Source is the official name, although it is sometimes referred to as HCMM Original.
   

Date Entered

• Field Definition:  The date this image was entered into the database at EROS.
   

Date Updated

• Field Definition:  The date this image was updated in the database at EROS. A blank field indicates not yet updated.
   

Days_Since_Launch

• Field Definition:  The number of days since launch that corresponds to image acquisition.
   

Entity ID

• Field Definition:  A unique identification code given to each scene based on sensor, acquisition date, acquisition time, product type, and roll number associated with the film source.

              Format:
              HCMMYYYYMMDDHHMM_B_A_RRRRRRR

              Values:
              HCMM = Sensor / Mission
              YYYY = Year
              MM = Month
              DD = Day
              HH = Hour
              MM = Minute
              B = Product type
              A = Quality
              R = Roll Film ID

              Where Product type valid codes:
              1 = DAY VIS
              2 = DAY IR
              3 = NIGHT IR
              4 = TEMP DIFF (elongated image)
              5 = THERMAL INERTIA (elongated image)
              6 = DAY VIS (elongated image)
              7 = DAY IR (elongated image)
              8 = NIGHT IR (elongated image)

              Example:
              HCMM1978051118390_7_A_8102701
 

Ephemeris Type

• Field Definition:  Provides the value of the correction applied to the footprint.

               Values:
               P = Predictive
               D = Definitive
 

Geometric Correction Applied

• Field Definition:  Indication of whether or not the procedure to remove geometrical distortions that arise from earth curvature, platform motion, relief displacement, or non-linearities in scanning motion were applied.
   

HCCM Digital Source Entity ID

• Field Definition:  A unique Digital Source identification code given to each scene based on agency project, acquisition date, acquisition time, version number, and product type.

               Format:
               AAYYYYMMDDHHMM1_3

               Values:
               AA = Agency Project (AEM-A)
               YYYY = Year
               MM = Month
               DD = Day
               HH = Hour
               MM = Minute
               1 = Version Number
               3 = Product Type

               Example:
               AA1978082502111_3
 

Image Format

• Field Definition:  The image format will be either framed elongated or framed square.
   

Image Length

• Field Definition:  The image length is indicated by number of pixels.
   

Image Scale

• Field Definition:  Scale size for this image
   

Image Type

• Field Definition:  The Heat Capacity Mapping Mission Radiometer operated with two channels. The first detected visible to near infrared (0.5 . 1.1 micrometers) radiation and the second detected thermal infrared (10.5 . 12.5 micrometers) radiation. HCMM nomenclature refers to the visible to near infrared channel as Vis and the thermal infrared channel as IR. The scenes are designated as follows

               Values:
               ALL = All available channels
               Day-IR = Day Infrared channel
               Day-VIS = Day Visible channel
               Night-IR = Night Infrared channel
               Temp-DIFF = Calculated Temperature Difference
               Thermal-I = Calculated Thermal Inertia
 

Image Width

• Field Definition:  Indicated by number of pixels.
   

Map Projection

• Field Definition:  Geographic projection of the image.

               Values:
               S = Space Oblique Mercator
               H = Hotine Oblique Mercator
 

Mission Number

• Field Definition:  AA = Refers to the agency project of AEM-A
   

Month

• Field Definition:  Refers to the month of acquisition.
   

Orbit Number

• Field Definition:  Refers to the mission orbit number.
   

Quality Flag

• Field Definition:  Attitude values clipped due to excessive range
   

Radiometric Correction Applied

• Field Definition:  Indication of whether or not the procedure to remove systematic or random noise affecting the amplitude (brightness) of the image was applied.
   

Resampling

• Field Definition:  Mode of calculation of pixel values.

               Values:
               Cubic = Creates new pixels from surrounding pixels.

               Bilinear = Creates the new pixels to be the color interpolated from linearly weighting the value and distance of the old                       pixel on either side of the new pixel on the same row.
 

Roll

• Field Definition:  The identifier assigned to film roll.
   

Sensor ID

• Field Definition:  The sensor identifier = HCMM or Heat Capacity Mapping Mission.
   

Sun Azimuth

• Field Definition:  Azimuth is the angle of horizontal deviation, measured clockwise, of a bearing from a standard direction. As on a compass, the azimuth is measured in degrees, with 360 in a full circle, counted in a clockwise direction from north. North has an azimuth value of 0 degrees, east is 90 degrees, south is 180 degrees, and west is 270 degrees.
   

Sun Elevation

• Field Definition:  Elevation is the angle of vertical deviation, measured clockwise, of a bearing from a standard direction. The Sun elevation angle at the scene center.

               Values:
               - 90.0000000 through + 90.0000000 degrees (with a 7-digit precision) >

               NOTE: A positive value
 

TIF File Size

• Field Definition:  Size of the Tagged Image File
   

Vendor_ID

• Field Definition:  Identification number for the scene assigned by NASA.

               Format:
               Example: AA0015135301_1
               AA = Agency Project (AEM-A)
               0015 = Days Since Launch
               135301 = Acquisition time
 

Version

• Field Definition:  Version number for the scene assigned by NASA.