BATHYMETRIC DATA HELD AT THE NATIONAL GEOPHYSICAL-DATA CENTER

The U.S. National Geophysical Data Center (NGDC), collocated with the World Data Center A for Marine Geology and Geophysics and the Internat ional Hydrographic Organization (IHO) Data Center for Digital Bathymet ry, operates and maintains several large bathymetric databases. These include the National Oceanic and Atmospheric Administration's (NOAA) N ational Ocean Service Hydrographic Database (NOSHDB), the global marin e geophysical database and a multibeam bathymetric database. In additi on, some gridded data sets derived from original data are available fr om NGDC. Data are provided on various forms of magnetic media, on comp act discs (CD-ROM), and also through the internet network via anonymou s file transfer protocol. Improved data access and retrieval is one of NGDC's priorities.