The National Map (http://nationalmap.gov/), "The nations' topographic map for the 21st century", is an online, interactive map service provided by the United States Geographical Survey (USGS). The National Map provides public access to high-quality, geospatial data and information from multiple partners to help support decisionmaking by resource managers and the public. The National Map is the product of a consortium of Federal, State, and local partners who provide geospatial data to enhance America's ability to access, integrate, and apply geospatial data at global, national, and local scales.
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