The National Water-Quality Assessment (NAWQA) Program is collecting water, ecological, and sediment data from hundreds of sites across the country in support of Regional Stream Quality Assessments (RSQA). USGS imagery is an important part of this work and is being used to validate locations of municipal wastewater discharge, surface-water impoundments, and irrigation patterns and to map transects across streams selected for monitoring. GPS technology is used to field verify and validate final coordinates for these sites. USGS imagery is readily available via various Web services to support GIS analyses.
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U.S. Department of the Interior