Global Land Survey 1975 Data Dictionary

 

Acquisition Date

• Field Definition:  The date the image was acquired.

          Format:

          YYYY/MM/DD

 

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

 

Datum

• Field Definition:  The datum associated with the image.

          Valid Code:

          WGS 84 = Worldgeodetic System 1984

 

Entity ID

• Field Definition:  This field uniquely identifies the individual landsat scene.

          Values:

          Example

               GLS 1975 Entity ID: P029R030_5X19901005

 

          Valid Format: PpppRrrrsXyyyymmdd

          P = WRS Path Number; next three characters

          ppp = WRS Path number

          R = WRS Row Number; next three characters

          rrr = WRS Row number

          s = Satellite number

          X = reserved space for future use

          yyyy = Year of acquisition

          mm = Month of acquisition

          dd = Day of acquisition

 

File Size

• Field Definition:  The size of the working copy or compressed data file size.

 

Orientation

• Field Definition:  The orientation of the image.

          Values:

          Valid code = NUP (North Up)

 

Product Size

• Field Definition:  The pre-compressed size of this product in megabytes.

 

Resampling Technique

• Field Definition:  The resampling applied to the scene.

           Valid Codes:

           CC = Cubic Convolution

           NN = Nearest Neighbor

 

Sensor ID

• Field Definition:  The sensor that acquired this data.

 

Satellite Number

• Field Definition:  The satellite which acquired the data.

Sun Azimuth

• Field Definition:  The Sun azimuth angle at the "true" WRS scene center. Azimuth is the angle of horizonal deviation, measured clockwise from the north.

          Values:

          -180.0000000 through +180.0000000 degrees (with 7-digit precision)

          NOTE: A positive value

 

Sun Elevation

• Field Definition:  The Sun elevation angle at the "true" WRS scene center. Elevation is the angle of vertical deviation from the tangent to the earth's surface (at scene center point) to the line between the sun's center and the scene center point. NOTE: The solar zenith angle will be 90 degrees minus the solar elevation angle.

          Values:

          0 through +90.0000000 (with a 7-digit precision)

 

WRS Path

• Field Definition:  The WRS-2 Path number associated with the scene.

          Values:

          001 through 233

 

WRS Row

• Field Definition:  The WRS-2 Row number associated with the scene.

          Values:

          001 through 244

 

Zone Number

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