Antarctic Single Frames Data Dictionary

 

Acquisition Date

• Field Definition:  The acquisition date refers to the year, month, and day the photography was acquired.

          Format:

               YYYY/MM/DD

               YYYY = Year

               MM = Month

               DD = Day

 

Agency

• Field Definition:  The agency that acquired the photography.

          Values:

          British Antarctic Survey

          U.S. Antarctic Resource Center

 

Cloud Cover

• Field Definition:  The percent of the frame that is obscured by clouds.

          Values:

          0 to 9 percent cloud cover

          10 to 19 percent cloud cover

          20 to 29 percent cloud cover

          30 to 39 percent cloud cover

          40 to 49 percent cloud cover

          50 to 59 percent cloud cover

          60 to 69 percent cloud cover

          70 to 79 percent cloud cover

          80 to 89 percent cloud cover

          90 to 100 percent cloud cover

 

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

 

Entity ID

• Field Definition:  The Entity ID allows for identification of the frame based on image parameters.

          Format:

          DDAPPPPRRRFFFF

          DD = Data set designator

          A = Agency, where C = U.S. Navy and X = British Antarctic Survey

          PPPP = Project

          RRR = Roll Number

          FFFF = Frame Number

          Example:

          ARCA139132V0169

 

Film Length and Width

• Field Definition:  The length and width of image frame contained on the roll of film.

          Values:

          Conversion: 1 inch = 25.4 millimeters

          Conversion Chart:

          2.25 inches = 57mm

         5.00 inches = 127mm

         7.00 inches = 178mm

         9.00 inches = 229mm

 

Flying Height in Feet

• Field Definition:  The flying height above sea or ice level at which the frame was acquired.

 

Focal Length

• Field Definition:  The focal length, in millimeters, of the sensor used to record the images on the film source. Conversion: 1 inch = 25.4 millimeters

 

Frame Number

• Field Definition:  The number assigned to a photographic frame on a roll of film.

 

High Resolution Download Available

• Field Definition:  This field indicates if a high resolution download at 25 microns (1,000 dpi) is currently available.

 

Image Type

• Field Definition:  The image type resulting from the film type used.

          Values:

          Black & White

          Color

          Infrared (B&W)

          Infrared (Color)

Note: Images are captured as they appear on film and are representative of the full tonal range of the original film source.        Images from color negative film are typically available as positive images, however, there are some medium resolution images that may need to be inverted.

 

Project

• Field Definition:  A unique series of letters and/or numbers used to define the project.

          Example:

          A1391

 

Quality

• Field Definition:  A rating of the overall image quality of the frame.

          Values:

          Good to Excellent

          Fair

          Poor

          Very poor

          NULL = No quality assigned

 

Recording Technique

• Field Definition:  The recording technique used in acquiring the image frame.

          Values:

          Vertical Cartographic

          Vertical Reconnaissance

          Low Oblique

          High Oblique

 

Roll Number

• Field Definition:  The number assigned to the film roll.

 

Scale

• Field Definition:  The scale of the image is the ratio of the distance on the image compared to the equivalent distance on the ground.

 

Stereo Overlap

• Field Definition:  Amount of overlap, in ten percent increments, of images within a flight line.