Antarctic Flight Line Maps Data Dictionary

Acquisition Date

• Field Definition:  January 1, 1948 is used as a generic acquisition date for the collection. The U.S. Navy began flying missions over Antarctica in 1946. The date on the topographic map pertains to the date that the map was created. The date for specific TMA missions can be determined by viewing Antarctic Single Frame Records. See helpful hints below for using TMA flight line numbers to search for Antarctic Single Frame Records.

Agency

• Field Definition:  The United States Antarctic Resource Center (USARC) is the United States contribution to the Scientific Committee on Antarctic Research (SCAR) Library system and is managed through an interagency agreement with the National Science Foundation to provide support to the USGS for mapping and geodetic activities for the U.S. Antarctic Program.

Coordinates Degrees, Minutes, Seconds

• 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 Decimal Degrees

• 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

Date of Update

• Field Definition:  The date of the update to the data, if any.

Entity ID

• Field Definition:  A unique series of letters and numbers used to identify the index.

          Format:

          ARDECUSARC0000125

          AR = Data set designator (Aerial Records)

          DE = Index Type (Large map-line plot)

          C = Navy (Flightlines represent photography acquired by the U.S. Navy)

          USARC = Project

          NNNNNNN = Index Number

         Example:

         ARDECUSARC0000125

Project

• Field Definition:  The Antarctic Flight Line Maps are part of the United States Antarctic Resource Center (USARC) project.