The National Geophysical Data Center (NGDC) provides scientific stewardship, products and services for geophysical data describing the solid earth, marine, and solar-terrestrial environment, as well as earth observations from space. It is their work on the marine geophysical data or bathymetry that is of interest to me. Bathymetry is the study of underwater depth of the ocean floors. A bathymetric map or chart usually shows floor relief or terrain as contour lines (called depth contours or isobaths), and may additionally provide surface navigational information.
It is this information often shown in 3D that many of our
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