VIIRS Data Dictionary

Acquisition End Date

• Field Definition:  The last day of data acquisition.

              Format:
              YYYY/MM/DD
 

Acquisition Start Date

• Field Definition:  The first day of data acquisition.

              Format:
              YYYY/MM/DD
 

Coordinates - Decimal Degrees

• Field Definition:  The latitude and longitude are provided in decimal degrees for the following fields:   

                 Values:
                 Coordinates 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 EarthExplorer.
 

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 data was last updated.
   

DOI Authority

• Field Definition:  System that provides an infrastructure for the registration and persistent reference of a Digital Object Identifier. The DOI name can be entered into a DOI Authority system to view the associated URL for the product.

              Example:
              http://dx.doi.org
              https://doi.org
 

DOI Name

• Field Definition:  Digital Object Identifier is used to uniquely and permanently identify a dataset. The DOI name is more stable than a URL and is used as a permanent reference for the product. The DOI name can be entered into a DOI Authority system to view the associated URL for the product.
   

Entity ID

• Field Definition:  The naming convention of each file is based on the Local Granule ID.

              Example:
              Grid Example: VNP09H1.A2012041.h22v13.001
              Global Example: VNP09CMG.A2017134.001
 

Horizontal Tile Number

• Field Definition:  Horizontal tile number of the 1200 km X 1200 km VIIRS grid for the granule, which increase from left to right.

              Values:
              00 through 35
 

Local Granule ID

• Field Definition:  The name of an individual file.

              Format:
              Grid Format: PPPPPPPP.AYYYYDDD.hTTvTT.VVV
              Global Format: PPPPPPPP.AYYYYDDD.VVV

             PPPPPPPP = Product Short Name
             AYYYYDDD = Julian Date of Acquisition
             hTT = Horizontal Tile Number
             vTT = Vertical Tile Number
             VVV = Version Number

            Example:
            Grid Example: VNP09H1.A2012041.h22v13.001.2017010025838.h5
            Global Example: VNP09CMG.A2017134.001.2017140160055.h5
 

Product Generation Algorithm

• Field Definition:  Version number of the Product Generation Algorithm used to create the file.
   

Version Number

• Field Definition:  The data version for the VIIRS product.
   

Vertical Tile Number

• Field Definition:  Vertical tile number of the 1200 km X 1200 km VIIRS grid for the granule, which increase from top to bottom.

              Values:
              00 through 71