20240314 09561100 1.0 FALSE Slope_2018 002 529876.913558 582928.313761 4222448.414883 4302472.528193 1 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) NAD_1983_UTM_Zone_10N <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.5.0'><WKT>PROJCS[&quot;NAD_1983_UTM_Zone_10N&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Transverse_Mercator&quot;],PARAMETER[&quot;False_Easting&quot;,500000.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-123.0],PARAMETER[&quot;Scale_Factor&quot;,0.9996],PARAMETER[&quot;Latitude_Of_Origin&quot;,0.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;EPSG&quot;,26910]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>-9998100</YOrigin><XYScale>450445547.3910538</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.00020000000000000001</ZTolerance><MTolerance>0.00020000000000000001</MTolerance><HighPrecision>true</HighPrecision><WKID>26910</WKID><LatestWKID>26910</LatestWKID></ProjectedCoordinateSystem> 150000000 5000 NAP 20260409 15543500 20260409 15543500 This slope layer depicts slopes in Napa County, derived from 2018 3DEP lidar-derived elevation data. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This slope layer depicts slopes in Napa County, derived from 2018 3DEP lidar-derived elevation data.</SPAN></P><P><SPAN STYLE="font-weight:bold;">Process:</SPAN></P><P><SPAN>This slope layer was created through the following steps:</SPAN></P><OL><LI><P><SPAN>Importing the 3DEP DEMs (described below) into ArcGIS Pro.</SPAN></P></LI><LI><P><SPAN>The slope geoprocessing tool was used, with the output set to percent and geodesic method in feet.</SPAN></P></LI><LI><P><SPAN>The Focal Statistic tool was applied to the slope layer using a neighborhood circle of a three radius cell size and a median statistic type.</SPAN></P></LI><LI><P><SPAN>The resulting raster was symbolized with a manual interval method using a multipart color scheme in accordance to County standards. </SPAN></P></LI></OL><P><SPAN STYLE="font-weight:bold;">Source data:</SPAN></P><P><SPAN>Elevation data was derived from bare-earth surface digital elevation models (DEMs) created from LiDAR data flown in 2018 in response to the widespread 2017 fires in Northern California as part of ongoing nationwide 3DEP (U.S. Geological Survey 3D Elevation Program) efforts. In limited areas, located along the western edge of the county boundary, supplemental DEMs were acquired from other sources to fill in gaps in the 3DEP data. Use of this supplemental data was negligible, totaling 24 acres out of 507,475 acres countywide (0.005% of total land area).</SPAN></P><P><SPAN>The data herein utilizes the NAD_1983_StatePlane_California_II_FIPS_0402_Feet (EPSG:2226) coordinate system (Lambert_Conformal_Conic Projection).</SPAN></P><P><SPAN /></P><P><SPAN>Original datums used in the 3DEP DEMs:</SPAN></P><P STYLE="margin:1 1 1 20;"><SPAN /><SPAN>Horiontal: North American Datum of 1983 (NAD83) </SPAN></P><P STYLE="margin:1 1 1 20;"><SPAN>Vertical: North American Vertical Datum of 1988 (NAVD88)</SPAN></P></DIV></DIV></DIV> Napa County Planning, Building, and Environmental Services Department, 2022 DEM Sources: - U.S. Geological Survey 3D Elevation Program (3DEP), 2018 Supplemental DEM Sources: - U.S. Geological Survey 3D Elevation Program (3DEP), 2015 - NASA Grant NNX13AP69G, the University of Maryland, and the Sonoma Vegetation Mapping and LiDAR Program, 2013 Slope_2018 elevation slope 2018 3DEP Napa County <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-weight:bold;">Open data. </SPAN><SPAN>This layer is open data. It is made available under the Public Domain Dedication and License version v1.0 whose full text can be found at:</SPAN></P><P><SPAN>https://opendatacommons.org/licenses/pddl/1.0/</SPAN></P><P><SPAN /></P><P><SPAN>Disclaimer: This GIS data is intended to provide a visual display of data for the user's convenience. Users of this data are hereby notified that the appropriate public primary information sources should be consulted for verification of the information. Although every reasonable effort has been made to assure the accuracy of this data, Napa County makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. Napa County assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused and assumes no liability for any decisions made or actions taken or not taken by the user of the data in reliance upon any information or data furnished hereunder. Because the GIS data provided is not warranted to be up-to-date, the user should check with the County staff for updated information.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> Esri ArcGIS 13.5.5.57366 1 -122.659013 -122.044101 38.870592 38.146100 20260409 Enterprise Geodatabase Raster Dataset dataset EPSG 6.13(3.0.1) Pixel 77426 51329 1.033556 1.033556 32 1 Upper Left FALSE LZ77 1 pixel codes SDR TRUE row and column 1.033556 1.033556 NOTE: this layer was originally called "clipMergedUTMDEM_031424_slope2_foCir3Med"