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Federal
USGS Water-Quality Data for the Nation - National Water Information System (NWIS)
Department of the Interior —
The USGS compiles online access to water-resources data collected at approximately 1.5 million sites in all 50 States, the District of Columbia, Puerto Rico, the... -
Federal
International Bathymetric Chart of the Arctic Ocean, Version 3.0
National Oceanic and Atmospheric Administration, Department of Commerce —
IBCAO Version 3.0 represents the largest improvement since 1999 taking advantage of new data sets collected by the circum-Arctic nations, opportunistic data collected... -
Federal
International Bathymetric Chart of the Arctic Ocean, Version 1.0
National Oceanic and Atmospheric Administration, Department of Commerce —
The goal of this initiative is to develop a digital data base that contains all available bathymetric data north of 64 degrees North, for use by mapmakers,...