GIS Data
USGS is a primary source of geographic information system (GIS) data. Our data and information is presented in spatial and geographic formats, including The National Map, Earth Explorer, GloVIS, LandsatLook, and much more. Explore GIS Data Maps.
Filter Total Items: 9608
(RLC-15) Geologic map of the Alphonsus GA region of the moon (RLC-15) Geologic map of the Alphonsus GA region of the moon
This map is one of a series prepared from photographs transmitted by Ranger IX (Jet Propulsion Lab., 1966., pls. A56-A58, B70-B82). It depicts the geology of some 724 sq km in the northeast part of the floor of Alphonsus (diameter about 115 km), a typical flat-floored old terra crater or basin with subdued rim. Similar basins abound in the south-central tarrae of the visible hemisphere...