Heat Capacity Mapping Mission Data Dictionary

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By Earth Resources Observation and Science (EROS) Center July 22, 2021

The Data Dictionaries are a set of information describing the contents, format, and structure of elements for EarthExplorer products.

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:

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.

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