{166DF28C-C0C6-4490-B837-F5C858B57ADD}2009021317052400TRUE2009021317241700The 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.The shapefile index is used to show the location and extent of each NED grid for California. Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.2009021320090213A package containing 2 shapefiles showing the extent of California's NED grids. NED_grid_index.shp is an index of the extent and location of NED grids of California and bordering neighbors. NED_info.shp contains processing attribute information at the 7.5 min grid level. Symbology layer files with corresponding names are included for quick viewing in ArcMap.