Declassified Satellite Imagery -1 (1996) Data Dictionary

 

Acquisition Date

• Field Definition:  The year, month, and day the image was acquired.

          Format:

         YYYY/MM/DD

         YYYY = Year

         MM = Month

         DD = Day

Browse Availability Flag/Image Preview

• Field Definition:  This flag identifies whether or not the entity has a browse image available with it. A browse image provides the user with a visual overview of an inventory item to check cloud cover and to verify that the area of interest is contained in the selected frame.

          Values:

          Yes

          No

 

Camera Resolution

• Field Definition:  The camera configuration is displayed in conjunction with an accompanying flight resolution (low, medium or high). Early missions acquired imagery with a single camera. Later missions acquired imagery with a dual aft-and-forward camera system which provided stereo coverage.

          Values:

          Stereo Medium

          Stereo High

          Vertical Low

          Vertical Medium

          Vertical High

 

Camera Type

• Field Definition:  This field is used to identify camera modes including aft coverage (panoramic aft mode); forward coverage (panoramic forward mode); vertical coverage (panoramic vertical mode); and cartographic coverage (mapping frame camera).

          Values:

          A = Aft

          C = Cartographic

          F = Forward

          V = Vertical

 

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

 

Direction Flag

• Field Definition:  This field is used to indicate direction of this acquisition.

          Example:

         053D

 

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-BRRRRCFFF

 

          DD = Dataset Name

          MMMM-B = Mission and Bucket Number

          RRRR = Revolution

          C = Camera Type

          FFF = Frame number

          Example:

          DS1038-1006DA033

 

Film Type

• Field Definition:  Film type available for this acquisition.

          Values:

          5 inch Framing Film (approximate size 5 inches x 5 inches)

          5 inch Panoramic (approximate size 5 inches x 25 inches)

          70mm Panoramic (approximate size 70mm x 29.8 inches)

 

Frame Number

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

 

Generation

• Field Definition:  This field is used to identify the generation of the film. All Declass-1 film sources at USGS EROS are duplicate copies of the original film held at NARA.

          Values:

          2 = Second generation

         3 = Third generation

 

High Resolution Download Available

• Field Definition:  This field indicates if a high resolution download is currently available for the product. Standard high resolution products are at a resolution of 25 microns or 1,000 dots per inch (dpi). Medium resolution products are at a resolution of 63 microns or 400 dpi.
  
  
  
  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 25 microns (1,000 dpi), 14 microns (1,800 dpi), or 7 microns (3,600 dpi). On-demand scanning options for color images include 25 microns (1,000 dpi) or 14 microns (1,800 dpi). Color images are limited to 14-micron due to file size.

 

Image Preview Availability

• Field Definition:  This flag identifies availability of a browse image. This preview image provides the user with a visual overview of an inventory item to check cloud cover and to verify that the area of interest is centered in the selected frame.

          Values:

          Yes

          No

 

Image Type

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

           Values:

           Black and White

           Color

           Color-Infrared

 

Mission Number

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

          Example:

               1049-1

 

Polarity

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

          Values:

          Negative

          Positive

 

Revolution

• Field Definition:  The number assigned during flight to indicate revolution including type of pass.

          Example:

              058D

 

          Valid Values:

          A = Ascending

          D = Descending

          M = Mapping