Declassified Satellite Imagery - 3 Data Dictionary

 

 

Acquisition Date

• Field Definition:  The year, month, and day the image was acquired.
  
  Format:
  YYYY/MM/DD

 

Camera Resolution

• Field Definition:  The KH-9 camera types are displayed in conjunction with an accompanying flight resolution.

          Values:

          The High Resolution Surveillance Camera has a resolution of 2 to 4 feet.

          The Terrain Mapping Camera has a resolution of 20 to 30 feet.

 

Camera Type

• Field Definition:  This field is used to identify camera modes.

          Format:

          A = High Resolution Surveillance Camera - Aft

          F = High Resolution Surveillance Camera - Forward

          T = Lower Resolution Terrain Mapping Camera

 

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

 

Download Available

• Field Definition:  This field is used to indicate if an image has already been scanned and is available for immediate download.

 

Entity ID

• Field Definition:  A unique series of letters and numbers based on information related to the photograph that are used to identify the image.

          Format:

          DDSMMMM-BOOOOOCFFF

          DD = Data set Name

          S = Status where C indicates Complete

          MMMM-B = Mission and Bucket Number

          OOOOO = Operations Number

          C = Camera Type A = Aft, F = Forward, T = Terrian

          FFF = Frame Number

          Example:

          D3C1219-100204A001

 

Film Type

• Field Definition:  Film Type indicates width and length of image on roll of film.

          Example:

          6.5 inch x variable

          9 inch x variable

 

Frame Number

• Field Definition:  Each image is designated by a number that indicates a frame position on a roll of film.

 

Generation

• Field Definition:  This field is used to identify the generation of the film. All Declass 3 film sources at USGS EROS are second generation copies. The EROS film copies are not the same resolution as the original film stored at NARA.

 

High Resolution Download Available

• Field Definition:  This field indicates if a high resolution download is currently available for the product.
  
  Note: EarthExplorer will have a shopping basket icon on the results page for images that are available for on-demand scanning. On-demand scanning options for black and white images include 14 microns (1,800 dpi), or 7 microns (3,600 dpi). On-demand scanning options for color images include 14 microns (1,800 dpi). Color images are limited to 14-micron due to file size.

 

Image Type

• Field Definition:  Image type identifies the film source as Black and White or Color Infrared.

          Values:

         Black and White

         Color Infrared

 

Mission Number

• Field Definition:  Number (6 characters) assigned to a single flight duration. This may include a bucket number of film.

          Format:

          MMMM-B

         MMMM = Mission number

         B = Bucket (Note: not every mission has a bucket number.)

        Example:

        1218-4

 

Operation Number

• Field Definition:  The operations number identifies the start and stop of each photographic sequence within a mission.

          Example:

          01394

 

Polarity

• Field Definition:  This field is used to identify the film source as a negative or positive image.

          Values:

          Negative

          Positive