Documentation for the 1996 U.S. Navy's Generalized Digital Environmental Model (GDEM) product database (NCEI Accession 9600094)
This archival package contains a document describing the US Navy Generalized Digital Environmental Model (GDEM). It does not include the profile data.

The GDEM is a four-dimensional (4-D) steady-state digital model of ocean temperature and salinity.  The model consists of gridded sets of coefficients with a grid …