King CountyFor more information about this layer please see the GIS Data Catalog . RTK ground check points are used to assess the vertical accuracy of the LiDAR data. Data was processed in reference to NAD83 (CORS96), however the horizontal datum for this dataset is defined as NAD83 (HARN) as the difference is generally small and allows for greater ease of use with data in different datums. The vertical datum is NAVD88, Geoid 03, and the data is projected in Washington State Plane North. Units are in US Survey Feet. Quantum Spatial collected the Lidar data from 02/24/16 through 5/25/2017.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/815951c8f92041e2bdc8a173400537b7_0engKing County GIS Open DataPublicRTK Ground Check Points for 2016 King County/Puget Sound Lidar Consortium Lidar Project [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)2016