USGS Global Fiducials Data Dictionary

Acquisition Date

• Field Definition:  The date of the data acquisition.

                 Format:
                 YYYY/MM/DD
 

Coordinates - Decimal Degrees

• Field Definition:  The latitude and longitude are provided in decimal degrees.

                 Values:
                 Coordinates are provided in decimal degrees for the following fields:  
                 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
 

Data Type

• Field Definition:  Type of data representing the pixel values.

                 Example:
                 Unsigned Eight-bit Integer
 

Date Updated

• Field Definition:  Date the data was last updated.
   

Ellipsoid

• Field Definition:  The name of ellipsoid used to map the image.
   

Entity ID

• Field Definition:  The naming convention for each file based on the Global Fiducials site and date of acquisition.

                Example:
                BERINGGLACIERAKSR20040226C
 

Map Projection

• Field Definition:  The reference system used to map the data.

                 Example:
                 Universal Transverse Mercator
 

PDF Vendor Scene ID

• Field Definition:  The scene ID provided by the Global Fiducials Library for the PDF file.

                 Example:
                 cacana_20000727_1_pdf
 

Pixel Size X

• Field Definition:  Pixel Size X is the longitudinal resolution for the pixel.
   

Pixel Size Y

• Field Definition:  Pixel Size Y is the latitudinal resolution for the pixel.
   

Platform

• Field Definition:  The system that represents a long-term periodic record for selected scientifically important sites.

                 Values:
                 U.S. National Imagery Systems
 

Product Format

• Field Definition:  Formats available for download.
   

Publication Date

• Field Definition:  This is the publication date as described in the Citation Section of the FGDC metadata document and corresponds to the date published by Global Fiducials Library.
   

TIF Vendor Scene ID

• Field Definition:  The scene ID provided by the Global Fiducials Library for the TIF file.

                 Example:
                 cacana_20000727_1_tif
 

Units

• Field Definition:  The mapping units associated with the pixel size (resolution).

                 Values:
                 Meters
 

UTM Zone Number

• Field Definition:  The UTM zone number associated with the image.