AVHRR Orbital Segment Data Dictionary

 

Acquisition Date

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

 

Acquisition Start Time

• Field Definition:  The start time (GMT) in hours, minutes, seconds when the data was acquired.

         Format:

         HH:MM:SS

 

Acquisition Stop Time

• Field Definition:  The stop time (GMT) in hours, minutes, seconds when the data was acquired.

          Format:

          HH:MM:SS

 

Archive Status

• Field Definition:  A flag to indicate the status of the data in the EDC archive.

          Values:

          G = Good

          X = Problem (multiple digital defects)

 

Available Bands

• Field Definition:  The five characters in the field represent the number and order of the data bands that are present in the image. Example: 12000 - Data bands 1-2 are in the order of 1-5, the last three bands are zero filled.

 

Browse Availability

• Field Definition:  This flag indicates the availability of a browse image.

 

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

 

Date Updated

• Field Definition:  Date the metadata record was added or last updated in the database.

 

Day/Night Indicator

• Field Definition:  This field indicates whether the data was acquired during a daytime or nighttime pass.

          Values:

          D = Day

          N = Night

 

Direction Flag

• Field Definition:  The flag to indicate whether the data was acquired while in an ascending or descending orbit.

 

Entity ID

• Field Definition:  The naming convention of each image is based on acquisition parameters.

          Format:

         AONNMMDDYYHHMMSS

        AO = Data Set Identifier

        NN = Satellite Number

        MMDDYY = Acquisition date expressed in month, day, and year

        HHMMSS = Acquisition start time expressed in hours, minutes, and seconds

        Example:

        AO14093099152513

 

Orbit Number

• Field Definition:  The orbit number associated with the data acquisition.

 

Pass Duration

• Field Definition:  This is the length of time in minutes from the start of an acquisition to the end of the acquisition. (Pass duration is truncated to full minutes, therefore a duration of 59 seconds will be expressed as 0 minutes in length.)

 

Satellite

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