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8d47c0e1709c4acc9a34bc788b20252e
20251205
https://socogis.sonomacounty.ca.gov/image2/rest/services/Rasters/Lidar_HydroFlat_BareEarth_DEM_2022/ImageServer
Image Service
<div style='text-align:Left;'><div><div><p><span>The Digital Terrain Model (DTM) represents the orthometric elevations of the earth’s surface with all above ground features removed. It is created by first creating a TIN of ground classified lidar returns and converting the TIN to a raster at the desired resolution. The DTM is hydro flattened.</span></p><p><span>Projected Coordinate System: State Plane NAD 1983 (2011), CA Zone II, US Survey Feet</span></p><p><span>Horizontal Datum: NAD 1983 2011</span></p><p><span>Vertical Coordinate System: NAVD88 (Geoid 18)</span></p><p><span>Pixel size = 3-ft</span></p><p><a href='https://storymaps.arcgis.com/stories/183976156b3940bc93167e7461fdc673' target='_blank' style='text-decoration:underline;'><span>LiDAR Derivatives for 14 California Counties</span></a></p><p><a href='https://tukmangeospatial.egnyte.com/dl/ADWSBBL7ac' target='_blank' style='text-decoration:underline;'><span>https://tukmangeospatial.egnyte.com/dl/ADWSBBL7ac</span></a></p><p><a href='https://tukmangeospatial.egnyte.com/dl/ADWSBBL7ac' target='_blank' style='text-decoration:underline;'><span>LiDAR Derivatives Datasheet Sonoma</span></a></p></div></div></div>
Lidar_HydroFlat_BareEarth_DEM_2022
2025-08-08T12:23:01
2025-08-08T12:23:02
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DEM
Sonoma County
Light Detection And Ranging
DTM
The Digital Terrain Model (DTM) represents the orthometric elevations of the earth’s surface with all above ground features removed. It is created by first creating a TIN of ground classified lidar returns and converting the TIN to a raster at the desired resolution. The DTM is hydroflattened. For this version of the DTM, the 2022 Bare Earth DTM was reprojected from UTM Zone 10 (with ground elevation pixel values in meters) to CA State Plane II (with pixel values in feet). The data were also resampled from a 1-meter cell size to a 3-feet cell size using the bilinear interpolation method to align with the 2013 DTM. Note that the vertical coordinate system of the 2022 DTM is DIFFERENT than the vertical coordinate system of the 2013 data. These lidar-derived data products are provided to Sonoma County as part of a larger 10-county effort to acquire lidar and prepare derivative products. Dates of collection vary by county and the best available (most recent and highest quality) point cloud data was used for any given area. The various point clouds were harmonized into a single, unified point cloud for the counties. From the unified point cloud, 36 raster lidar derivatives were created for each county. See the datasheet ( https://tukmangeospatial.egnyte.com/dl/ADWSBBL7ac ) for information on collection dates and to access the original DTM (in UTM Zone 10N, meters), lidar point cloud, and other derivative products
Funders: California Natural Resources Agency, State Coastal Conservancy, NASA, USGS, Sonoma Water, University of California, San Diego, Sonoma Ag + Open Space, Humboldt Bay Municipal Water District
Grantees & Coordinating Organizations: North Coast Resource Partnership, Solano County
Technical Team: NV5 Geospatial and Tukman Geospatial
Esri ArcGIS 13.5.3.57366
1
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