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Geographic Information Systems
Better Assessment Science Integrating Point and Nonpoint Sources (BASINS) - integrates a geographic information system (GIS), national watershed data, and state-of-the-art environmental assessment and modeling tools into one convenient package.
Geospatial Data Clearinghouse - this site provides access to geospatial data used in Geographic Information Systems (GIS) to identify the location and characteristics of natural or man-made features and boundaries on the earth.
Spatial Data and Applications - The Envirofacts warehouse uses spatial data from a variety of sources, in several different mapping applications.
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