Released on December 4, 2001
This visualization shows how Mars might look with an ocean at -500m where the lowest point on Mars is about -8000m and the highest point is about 22000m. Data from The FUSE spacecraft and from the Mars Global Surveyor/MOLA instrument where used to support this theory.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 188.8.131.52.0