#Usgs geologic map viewer software#

#Usgs geologic map viewer software#

Additional details on these topics, along with detailed descriptions of the type localities for the material units, may be found in the companion paper to this map (Patterson and others, 2010). These maps are best used with global positioning software or a map viewer. We summarize the properties of the imaging dataset used to construct the map, previously published maps of Ganymede, our own mapping rationale, and the geologic history of Ganymede. As the years passed, the USGS produced new map versions of each area. This mapping was done at different levels of detail, in order to support various land use and other purposes. This map represents a synthesis of our understanding of Ganymede geology after the conclusion of the Galileo Mission. In 1879, the USGS began to map the Nation's topography. Images of Ganymede suitable for geologic mapping were collected during the flybys of Voyager 1 and Voyager 2 (1979), as well as during the Galileo Mission in orbit around Jupiter (1995РІР‚вЂњ2003). Geologic Map Index of Alaska Map Index provides outlines of DGGS and USGS geology-related maps of Alaska.

The history of Ganymede can be divided into three distinct phases: an early phase dominated by impact cratering and mixing of non-ice materials in the icy crust, a phase in the middle of its history marked by great tectonic upheaval, and a late quiescent phase characterized by a gradual drop in heat flow and further impact cratering. Users can also view IFSAR datasets such as DTM, DSM, ORI, and contours. Ganymede is the largest satellite of Jupiter, and its icy surface has been formed through a variety of impact cratering, tectonic, and possibly cryovolcanic processes.