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Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, soils mapping, resource monitoring, mapping, and visualization applications. |
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Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, soils mapping, resource monitoring, mapping, and visualization applications. |
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U.S. Department of Agriculture (USDA) Natural Resources Conservation Services, National Cartography & Geospatial Center |
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["Data","Service","Image Service","ArcGIS Server"] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-size:10pt">The U.S. Geological Survey has developed a National Elevation Database (NED).The NED is a seamless mosaic of best-available elevation data. The 7.5-minute elevation data for the conterminous United States are the primary initial source data. In addition to the availability of complete 7.5-minute data, efficient processing methods were developed to filter production artifacts in the existing data, convert to a consistent datum, edge-match, fill slivers of missing data at quadrangle seams, recast the data to a consistent geographic projection and convert all elevation values to decimal meters as a consistent unit of measure. </SPAN><SPAN /><SPAN /><SPAN /></P><P><SPAN STYLE="font-size:10pt">NED has a resolution of one-third arc-second (approximately 10 meters) for much of the conterminous United States, Hawaii and Puerto Rico in a NAD83 datum. There is a resolution of two arc-seconds for Alaska and the datum is NAD27. </SPAN><SPAN /><SPAN /><SPAN /></P><P><SPAN STYLE="font-size:10pt">NED at 10 meters is created using the same methods outlined above with the source data being mostly the 10m DEMs. DEMs at 5 meters, 1/3 arc-second, and 1/9 arc-second maps are also used where available. In some cases, the 10m NED is resampled from LIDAR or created using aerial photography. </SPAN><SPAN /><SPAN /><SPAN /></P><P><SPAN STYLE="font-size:10pt">One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives. Artifact removal greatly improves the quality of the slope, shaded-relief, and synthetic drainage information that can be derived from the elevation data. Geospatial elevation data are used by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications. </SPAN><SPAN /><SPAN /><SPAN /></P><P><SPAN STYLE="font-size:10pt">NRCS has elected to </SPAN><SPAN STYLE="font-style:italic;font-size:10pt">ONLY</SPAN><SPAN STYLE="font-size:10pt">serve NED 10 which is 10 meter or better and not NED 10 which was resampled from 30 meter. NRCS also serves the maps in a UTM projection. These two facts differentiate the maps from those served at </SPAN><A href="http://seamless.usgs.gov/"><SPAN STYLE="font-size:10pt">http://seamless.usgs.gov/</SPAN></A><SPAN STYLE="font-size:10pt">. </SPAN></P></DIV></DIV></DIV> |
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SoCo_USGS_10M_DEM_1990 |
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Image Service |
| url:
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https://s-wgispubimg1.win.root.sonoma.gov:6443/arcgis/admin |
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["Earth Science","Land Surface","Topography","Landforms","Terrain Elevation","DEM","Digital Elevation Model","USGS","NRCS","NCGC."] |
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en-US |
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SoCo_USGS_10M_DEM_1990 |
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