Coastal National Elevation Dataset (CoNED) - Topobathymetric Digital Elevation Model (TBDEM) Data Dictionary

 

Agency

• Field Definition:  The CoNED Project is a collaboration between the USGS Coastal and Marine Geology Program (CMGP), the National Geospatial Program (NGP), and the National Oceanic and Atmospheric Administration (NOAA) National Geophysical Data Center (NGDC).

 

Begin Date

• Field Definition:  The first year 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 project.

 

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:  The date the product was updated in the database at USGS EROS. A blank field indicates that the data not been updated.

 

End Date

• Field Definition:  The last year 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 project.

 

Entity ID

• Field Definition:  This field describes the naming convention of each file.

          Format:

          DDDDDPPPPNNNNN

 

          DDDDD = Dataset designator (TBDEM)

          PPPP = Project name abbreviation*

          NNNNN = Sequential number generated by database at time of ingest

         * Northern Gulf of Mexico shortened to NGOM

         Example:

         TBDEMNGOM00034

 

Horizontal Datum

• Field Definition:  The horizontal reference system associated with the data.

          Example:

          NAD83

 

Map Projection

• Field Definition:  The reference system used to map the data.

          Example:

         Geographic or UTM

 

Project

• Field Definition:  A name given to a set of CoNED TBDEM data files that identifies the area of coverage.

          Example:

          Northern_Gulf_of_Mexico

 

Process Date

• Field Definition:  The year and month that the CoNED TBDEM was developed and published.

           Format:

           YYYY/MM

           YYYY = Year

           MM = Month

 

Resolution

• Field Definition:  The distance on the ground between elevation data points.

 

Units

• Field Definition:  The unit of measure associated with the resolution.

 

Vertical Datum

• Field Definition:  The vertical reference system associated with the data is the North American Vertical Datum of 1988 (NAVD88) in meters.