AVHRR Global 1K Data Dictionary

 

 

Acquisition Year

• Field Definition:  The acquisition year refers to the year in which the source data were acquired.

 

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

 

End Date

• Field Definition:  The last day of data acquisition for source data used to create the global 1K composite.

          Format:

               YYYY/MM/DD

 

Entity ID

• Field Definition:  The naming convention of each scene is based on acquisition parameters.
  
  Format:
  DDPPPSSYYYYMMDDmmdd
  DD = Dataset Designator (AVHRR Global)
  PPP = Project (1 KM)
  SS = Number of NOAA Satellite
  YYYYMMDD = Acquisition Start Date (Year, Month, & Day)
  mmdd = Acquisition End Date (Month & Day)
  
  Example:
  AG1KM11199210011010

 

Map Projection

• Field Definition:  The geometric manipulation applied to the image.

          Values:

          Interrupted Goode Homolosine

 

Month Number

• Field Definition:  The calendar month of the 1 K composite.

 

Satellite Number

• Field Definition:  The number of the NOAA satellite carrying the AVHRR sensor that acquired the source data.

          Example:

          11 = NOAA-11

          14 = NOAA-14

 

Spheroid

• Field Definition:  The shape and size of a geographic coordinate system's surface is defined by a sphere or spheroid. The earth is best represented by a spheroid. Because of gravitational and surface feature variations, the earth is neither a perfect sphere nor a perfect spheroid. Satellite technology has revealed several elliptical deviations; for example, the South Pole is closer to the equator than the North Pole. Satellite-determined spheroids are replacing the older ground-measured spheroids. The radius of the spheroid in meters.

         Example:

         6370997

 

Start Date

• Field Definition:  The first day of data acquisition for the source data used to create the global 1K composite.

          Format:

               YYYY/MM/DD