Measured and Estimated Seafloor Topography

David T. Sandwell, Walter H. F. Smith, Stuart M. Smith, and Christopher Small
(Institute for Geophysics and Planetary Physics, SIO, Geodynamics Laboratory, NOAA - Geological Data Center, SIO - Lamont Doherty Earth Observatory)

The data is available here as a dataset, including manipulatable views and downloadable subsets.

The original data and documentation are here.