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Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications. The full USGS DEM contours for Sonoma County were sectioned into 14 separate tiles. This was done to reduce the resources required to render them by limited them to specific areas. This feature class is one of those tiles. |
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Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications. The full USGS DEM contours for Sonoma County were sectioned into 14 separate tiles. This was done to reduce the resources required to render them by limited them to specific areas. This feature class is one of those tiles. |
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County of Sonoma GIS Central, USGS NED. |
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50000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The U.S. Geological Survey has developed a National Elevation Dataset (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 the NAD83 datum, edge-match, and fill slivers of missing data at quadrangle seams. One of the effects of the NED processing steps is a much-improved base of elevation data for calculating slope and hydrologic derivatives. These 40 foot contours for Sonoma County were derived from the above.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>None. Acknowledgement of the originating agencies would be appreciated in products derived from these data.</SPAN></P></DIV></DIV></DIV> |
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| title:
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BASE.ELE_CONTOUR_SXN_9 |
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| tags:
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["Contours","Land Surface","40 Foot","12 Meter"] |
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en-US |
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500000 |
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