The latitude, longitude, and size of each feature were digitally measured in 2001 and 2002 using the Mars Digital Image Mosaic (MDIM) version 2.0. (See Lunar and Planetary Science XXXI paper MDIM 2.0: A Revised Global Digital Image Mosaic of Mars (R. L. Kirk and others) [PDF] for more information on MDIM 2.0.)
For All Approved Features: MARS_nomenclature.zip MARS_nomenclature.kmz