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eVIIRS Global NDWI Data Dictionary

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By Earth Resources Observation and Science (EROS) Center May 2, 2023

The Data Dictionaries are a set of information describing the contents, format, and structure of elements for EarthExplorer products.

 

Agency

  • Field Definition:  The U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center is the organization responsible for maintenance and distribution of this data collection.

 

Begin Date

  • Field Definition:  The first day of data acquisition for the source data at the start of the collection period. The begin date and end date are used to indicate the date range for the product.

 

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 the source data at the end of the collection period. The begin date and end date are used to indicate the date range for the product.

 

Entity ID

  • Field Definition:  The naming convention of each file is based on product attributes.

              Format:

              EVGNDWS20200701202007106 

              EV = Dataset Designator (eVIIRS)

              GNDW = Global Normalized Difference Water

              P = Platform: SUOMI NPP or JPSS

              YYYYMMDD = Begin date of cycle

              yyyymmdd= End date of cycle

              V = Version of source data

             Example:

             EVGNDWS20200701202007106

 

Map Projection

  • Field Definition:  The method of representing the surface of the earth on a plane using grid lines of latitude and longitude.

 

Pixel Resolution

  • Field Definition:  The pixel resolution in meters.

 

Platform

  • Field Definition:  The Suomi NPP and Joint Polar Satellite System (JPSS)

Sensor

  • Field Definition:  The Visible Infrared Imaging Radiometer Suite (VIIRS) sensor is the instrument used to acquire the data.

 

Version

  • Field Definition:  The version of VIIRS source data used to create the product. The original eVIIRS Global NDWI data set was processed using VIIRS  source data.

The Data Dictionaries are a set of information describing the contents, format, and structure of elements for EarthExplorer products.

 

Agency

  • Field Definition:  The U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center is the organization responsible for maintenance and distribution of this data collection.

 

Begin Date

  • Field Definition:  The first day of data acquisition for the source data at the start of the collection period. The begin date and end date are used to indicate the date range for the product.

 

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 the source data at the end of the collection period. The begin date and end date are used to indicate the date range for the product.

 

Entity ID

  • Field Definition:  The naming convention of each file is based on product attributes.

              Format:

              EVGNDWS20200701202007106 

              EV = Dataset Designator (eVIIRS)

              GNDW = Global Normalized Difference Water

              P = Platform: SUOMI NPP or JPSS

              YYYYMMDD = Begin date of cycle

              yyyymmdd= End date of cycle

              V = Version of source data

             Example:

             EVGNDWS20200701202007106

 

Map Projection

  • Field Definition:  The method of representing the surface of the earth on a plane using grid lines of latitude and longitude.

 

Pixel Resolution

  • Field Definition:  The pixel resolution in meters.

 

Platform

  • Field Definition:  The Suomi NPP and Joint Polar Satellite System (JPSS)

Sensor

  • Field Definition:  The Visible Infrared Imaging Radiometer Suite (VIIRS) sensor is the instrument used to acquire the data.

 

Version

  • Field Definition:  The version of VIIRS source data used to create the product. The original eVIIRS Global NDWI data set was processed using VIIRS  source data.
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