U.S. Geological Survey's (USGS) The National Map
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下载链接：
https://data-uvalibrary.opendata.arcgis.com/apps/uvalibrary::u-s-geological-surveys-usgs-the-national-map
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资源简介：
<span style='background-color: rgb(255, 255, 255);'><font color='#696969' size='2'><span style='font-family: Verdana, Arial, Helvetica, sans-serif;'>As one of the cornerstones of the U.S. Geological Survey's (USGS) </span><a href='https://www.usgs.gov/ngpo/' style='font-family: Verdana, Arial, Helvetica, sans-serif;'>National Geospatial Program</a><span style='font-family: Verdana, Arial, Helvetica, sans-serif;'>, </span><i>The National Map</i><span style='font-family: Verdana, Arial, Helvetica, sans-serif;'> is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. </span></font></span>
提供机构：
University of Virginia
