Contains databases of Geographic Information Systems Maps.
Users can search for maps by geographic area, data type and data provider.
Some maps and data must be purchased. Displays accompanying maps. National Weather Service weather.gov Information on severe weather, with links to graphics version of site that includes live videos, photographs and interactive maps. U.S. Geological Survey National Mapping Information mapping.usgs.gov Contains information on obtaining maps, atlases, aerial photographs, satellite imagery, global land information, hydrography information and other USGA products. Winter driving information, including chain installation, chain chart, mountain pass closures, daily snow depths and snow and ice control.