{ "currentVersion": 11.3, "serviceDescription": "Field Survey Operations\nThe field survey included refresh of eighteen (18) aerial targets established for the 2017\nproject and twenty-one (21) new aerial targets. In addition, nineteen (19) QA/QC points were established within the LiDAR portion of the project. The aerial targets and QA/QC points were processed using four CGPS stations in the vicinity of Study Area.\nDetails on the Field Survey Operations are presented in the Survey Task Order Report dated September 23, 2019.\n\nHorizontal and Vertical Datums\nThe horizontal datum used for this project is the North American Datum of 1983 (NSRS2007). Coordinates shown are California Coordinate System Zone 2 (CCS2). Units are U.S. Survey Feet. Elevations established in this survey are North American Vertical Datum of 1988 (NAVD88) as derived from applying Geoid 12B to ellipsoid heights.\n\nAirborne Data Acquisition\nThe airborne LiDAR mission was performed on Thursday, July 25, 2019. The sensor used to collect the data is a Teladyne/Optech Galaxy PRIME and the laser was set to emit 10 points per square meter (10 PPM^2). The LiDAR strips were processed and calibrated using Optech\u2019s LMS software suite and data from the CGPS stations identified in Survey Report. The LiDAR strips were tiled and classified for bare-earth using TerraScan software.\nThe airborne imagery missions were performed separately from the LiDAR mission. We used an UltraCAM Eagle Mark 2 large format digital camera. Imagery was acquired on July 24, July 26, and August 2, 2019 using a ground sample distance of 0.21ft.\n\nLiDAR Derived Deliverables\nThe georeferenced point cloud data was classified to bare-earth and then model key-points were created. The model key-points were used to develop TIN surfaces in two formats: MicroStation InRoads and AutoCAD Civil 3D. Additionally, raster DEM surface with a one-foot cell size were generated from bare-earth point class.\n\nDWR makes no warranties or guarantees \u2014 either expressed or implied \u2014 as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data. \n\nThis is an official DWR Image Service, published on September 30, 2019 by the Division of Engineering, Geodetic Branch, Geospatial Data Support Section, who may be contacted at gis@water.ca.gov.", "name": "elevation/FeatherSacRiver_DEM_2019", "description": "Field Survey Operations\nThe field survey included refresh of eighteen (18) aerial targets established for the 2017\nproject and twenty-one (21) new aerial targets. In addition, nineteen (19) QA/QC points were established within the LiDAR portion of the project. The aerial targets and QA/QC points were processed using four CGPS stations in the vicinity of Study Area.\nDetails on the Field Survey Operations are presented in the Survey Task Order Report dated September 23, 2019.\n\nHorizontal and Vertical Datums\nThe horizontal datum used for this project is the North American Datum of 1983 (NSRS2007). Coordinates shown are California Coordinate System Zone 2 (CCS2). Units are U.S. Survey Feet. Elevations established in this survey are North American Vertical Datum of 1988 (NAVD88) as derived from applying Geoid 12B to ellipsoid heights.\n\nAirborne Data Acquisition\nThe airborne LiDAR mission was performed on Thursday, July 25, 2019. The sensor used to collect the data is a Teladyne/Optech Galaxy PRIME and the laser was set to emit 10 points per square meter (10 PPM^2). The LiDAR strips were processed and calibrated using Optech\u2019s LMS software suite and data from the CGPS stations identified in Survey Report. 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