20060629 15125400 FALSE 20060705 10410500 20090505 12342200 {E5182F5E-63EF-4259-926B-4D4950ABAEDD} Complete None planned This is Category I data. Category I data are public domain and available to share with Caltrans partners. This is Category I data. Category I data are public domain and available to share with Caltrans partners. mailing and physical address

1120 N St., MS 38

Sacramento CA 95814 USA Caltrans TSI/GIS Data Branch (916) 654-5037 (916) 654-6583 none DEMDigital Elevation ModelUSGSlattice CA none California Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722enThe DEMs cover the entire state of California, plus neighboring portions of Oregon, Nevada, and Arizona. The DEMs are stored as Arc/Info GRIDs that cover 1 degree of latitude and longitude. The GRIDs overlap the degree boundaries to the extent required to make a rectangle in the Albers projection. This means that adjacent GRIDs overlap, however the data values are identical in the overlap areas. Thus, when merging adjacent DEMs, it makes no difference which DEM takes preference, and no averaging is required.The purpose of the DEM24k raster dataset was to provide 1:24000 DEM imagery by 1 degree block for the state of CaliforniaAlso available is a single statewide seamless DEM clipped to the 1:100,000 scale state boundary. Areas outside the state or coastline have been set to NO DATA. LATTICE NAME: d<xxxxx> LATTICE AREA: 1 x 1 degree block tiles Lattice names begin with a "d" and are based on the latitude and longitude of the southeast corner of the degree block. For example, the southeast corner of lattice "d36121" is located at latitude 36 00 00, longitude -121 00 00. The table below shows the 1x1 degree blocks necessary for displaying the Caltrans District extents:United States Geological Survey20000101d32114raster digital datahttp://www.dot.ca.gov/hq/tsip/gis/datalibrary/gisdatalibrary.htmlpublication date20000101-115.062467-113.92613433.04897131.950483467464.056447567874.056447-655243.027653-539263.027653Raster DatasetUnited States Geological Survey (USGS)UnknownThis can be ordered from: Earth Science Information Center U.S. Geological Survey 507 National Center Reston, Virginia 22092 (703) 648-6045 Or it is available online at: http://edcwww.cr.usgs.gov/Webglis/glisbin/guide.pl/glis/hyper/guide/usgs_dem Caltrans TSI/GIS Data Branch Metadata Coordinator mailing and physical address Sacramento CA 95814

1120 N St., MS 38

USA (916) 654-5037 (916) 654-6583 enFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local time20090505http://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile Caltrans TSI/GIS Data Branch mailing and physical address

1120 N St., MS 38

Sacramento CA 95814 USA (916) 654-5037 (916) 654-6583 This is Category I data. Category I data are public domain and available to share with Caltrans partners. Downloadable Data7.5467.546 United States Geological Survey2000Database2000publication dateUSGSUSGS National Elevation Database provided a mosaic of elevation data that the DEM's were extracted.United States Geological Survey 2000Extracted DEMs from the USGS National Elevation Database.24000CD-ROM2000publication dateDEMThese are the extracted DEMs from the USGS National Elevation DatabaseDEMThe DEMs were extracted from the USGS National Elevation Database, described by USGS as "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 DEMs were received as 7 Arc/Info GRIDs that seamlessly mosaic (because they were extracted from a seamless GRID) with horizontal coordinates in decimal degrees and vertical units in floating point meters. The following processes were applied to the seven DEMs: 1. Converted to integer centimeters (in order to preserve vertical resolution but reduce storage requirements). 2. Mosaicked into a single statewide DEM. 3. Projected to Albers equal area (horizontal units are meters, cell size 30 meters) using a bilinear resampling method. 4. Vertical units were converted to integer feet. Zunits: The final DEMs were stored with elevation values as integer feet in order to reduce storage requirements (integers require much less storage than floating point values), yet preserve some precision (feet are smaller units of measurement than meters).ARC/INFO Rev 7.2.1, Sun Sparc 3000 workstation2000These DEMs are a superior product to the 30 meter DEMs traditionally available from USGS. These have been processed to remove production artifacts, edgematched, and any interquad gaps filled in. These have been generated from the best available DEMs, though the horizontal resolution of any 10meter DEMs has been lost by resampling to 1 arc-second. These are better than the standard DEM product for calculating hydrologic deriviatives, but cannot be considered a hydrologically correct DEM. The DEMs cover the entire state of California, plus neighboring portions of Oregon, Nevada, and Arizona. The DEMs are stored as Arc/Info GRIDs that cover 1 degree of latitude and longitude. The GRIDs overlap the degree boundaries to the extent required to make a rectangle in the Albers projection. This means that adjacent GRIDs overlap, however the data values are identical in the overlap areas. Thus, when merging adjacent DEMs, it makes no difference which DEM takes preference, and no averaging is required. Also available is a single statewide seamless DEM clipped to the 1:100,000 scale state boundary. Areas outside the state or coastline have ben set to NO DATA.Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722d32114467464.056447567874.056447-539263.027653-655243.0276531-115.062467-113.92613433.04897131.9504831ISO 19115 Geographic Information - MetadataDIS_ESRI1.0dataset002file://\\SVHQDIVDATA3\VOL1\Highways\GIS\DataBranch\metadata\Shapefiles_Not_QC\dem24k\d32114Local Area Network7.546Raster DatasetRasterGrid Cell3866334730.00000030.000000161Upper LeftFALSEDefault1matrix valuesFALSEESRI GRIDGCS_North_American_1983NAD_1983_Albersrow and columnmeters30.00000030.000000Albers Conical Equal Area34.00000040.500000-120.0000000.0000000.000000-4000000.000000North American Datum of 1983Geodetic Reference System 806378137.000000298.257222NAD_1983_Albers21334730Meter1 Meter = 1 Meter(s)386630Meter1 Meter = 1 Meter(s)d32114Table2930The DEM24k provides degree block 1:24000 raster DEM data for the state of CaliforniaCaltrans TSI/GIS Data BranchObjectIDObjectIDOID400Internal feature number.ESRISequential unique whole numbers that are automatically generated.ValueValueInteger000USGS DEM Elevation IdentifierUSGSCountCountDouble000Total number of the USGS DEM Elevation IdentifierUSGSValueValueInteger000USGS DEM Elevation IdentifierUSGSCountCountDouble000Total number of the USGS DEM Elevation IdentifierUSGS20090505