Average Annual Salinity Digital Geography - Data Dictionary:

Metadata for the 3-Zone, Average Annual Salinity Digital Geography
last updated: 19 March 1999

 

The digital geography is  in geographic coordinates, datum = NAD83, spheroid = GRS1980

 

Extent of the 3-Zone, Average Annual Salinity Digital Geography
Geography  provides digital data 132 estuaries within contiguous US.
The unprojected (geographic coordinates) 3-Zone, Average Annual Salinity Digital Geography for the coterminous United States.

 

Polygon attributes found in the 3-Zone, Average Annual Salinity Digital Geography
EDA_SZNAME A unique polygon name created by concatenating watershed (EDASUBEDA) code and Salinity Zone (SZ_NAME).
REGION Region of the United States.
  N Polygons of the North Atlantic region.
  M Polygons of the Middle Atlantic region.
  S Polygons of the South Atlantic region.
  G Polygons of the Gulf of Mexico region.
  P Polygons of the Pacific region.
  L Polygons of the Great Lakes region.
  U Polygons within the US border, but not a part of the CAF.
  X Polygons outside US boundaries.
EDASUBEDA A code assigned to each derived spatial area (e.g., an EDA or CDA).  Concatenated from the EDACDA attribute and SUBEDA attribute from NOAA's Coastal Assessment Framework.
SZ_NAME A text description of each salinity zone
  Mixing Zone 5 - 25 parts per thousand salinity.
  Seawater Zone 25 parts per thousand or greater salinity
  Tidal Fresh Zone 0 - 5 parts per thousand salinity
AREA_MI2 Area of salinity zone in square statute miles (calculated from geographies in Albers equal-area conic projection; minor distortion above and below standard parallels).