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These layers are divided into framework categories: Places, Structures, Transportation, Boundaries, Hydrography, Orthoimagery, Land Cover, and Elevation. An approach is to provide free downloads of national base layers, as well as other geospatial data layers.
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Geological Survey (USGS) and the EROS Data Center (EDC) are committed to providing access to geospatial data through The National Map. The National Map Seamless Server is the ultimate location to explore and retrieve data. DRG's are regularly used in GIS applications.Ĭlick on the first letter of the state for the TOPO map you are interested in: The map file is UTM projected and georeferenced to the surface of the earth. The raster image usually includes the original border information, referred to as the "map collar". DRGs created by USGS are typically scanned at 250 dpi and saved as a TIFF. <- Free Global, Regional, State, City MapsĪccording to Wikipedia, a digital raster graphic (DRG) is a digital image resulting from scanning a paper USGS topographic map for use on a computer. Worst Case Scenarios: Terrorism & industrial chemicals. Hazardscapes - Toxic and Nuclear Risks in your backyard. Public Employees for Environmental ResponsibilityĬlimate Shift - The effects of climate shift on the future of planet earth and its inhabitants. Streams & Rivers Shapefilesĭownload Indian & Federal Land Shapefilesĭidn't find what you are looking for? Email me and I'll find it for you.
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Geographic Names Information System, Nuclear Facilities, Zip Code Boundaries, School Districts, Indian & Federal Lands, Climate Change, Tornadoes, Dams - Create digital GIS maps in minutes.ĭownload Zip Code with Demographics Shapefilesĭownload U.S. GIS Shapefile Store - for Beginners & Experienced GIS Users Alike. Home Store Free GIS Education Free Shapefiles Census Weather Energy Climate Change News Maps TOPO Aerial GPS Learn GIS