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Geographic Information Systems (GIS): GIS Data Sources and Websites
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Definitions for GIS terms related to operations such as analysis, GIS modeling and web-based GIS, cartography, and Esri software.
The National Map
A nationwide repository of integrated data from local, State, Federal, and other sources.
US Topo Maps for America
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Earth Explorer - USGS
Yale University's Center for Earth Observation
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Ask questions about ArcGIS software.
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Free GIS Data Sets
Freely GIS Data
Links to + 500 sites providing freely available geographic datasets.
10 Free GIS Data Sources: Best Global Raster and Vector Datasets
Natural Earth
Natural Earth is a public domain map dataset available at 1:10m, 1:50m, and 1:110 million scales.
Free Spatial Data
This site provides free spatial data for the whole world that you can use in DIVA-GIS or other programs.
