Illumination ranges from extremely low sun angles along the 300 and 120 meridians, marking the approximate location of the terminator during the Voyager 2 flyby, to about 65 elsewhere. Topography and morphology are difficult to discern in the poorly imaged portion of the map region. Therefore, materials here are mapped as albedo units and crater materials only. The albedo units may include any or all of the units in the better imaged portion of the region or even entirely different materials. All attributes created during the creation process were verified by displaying the lines in both the database and the spatial coverage, but no formal tests were performed.
Line geometry is topologically clean.
Information has been obtained from sources believed to be reliable, but its accuracy and completeness and the opinions based thereon, are not guaranteed. As every effort is made to provide accurate information in this database, USGS would appreciate it if users could call to our attention any errors that may occur by communicating with the contact person.