PDS TEXT objects have attached labels. The label fully describes the format and content of its associated file. Some data files contain more than one structure. The Goddard group has also provided a grid of gravity anomaly uncertainties. The JPL group has provided a grid of geoid height above a reference ellipsoid.
All grids have one degree point spacing and use a simple cylindrical projection.
The BRO directory contains PostScript representations of both gridded products from the Goddard group. These data were collected under auspices of the Mars Global Surveyor Project. G. Leonard Tyler of Stanford University was the Radio Science Team Leader. Members of the Team and its support elements involved in data acquisition and validation included Patricia Priest, Paula Eshe, William Sjogren, Frank Lemoine, and Joe Twicken. Although considerable care has gone into making this volume set, errors are possible.