King CountyFor more information about this layer please see the GIS Data Catalog . RTK (real time kinematic) ground control points collected for the PSLC King County Delivery Lidar dataset. RTK ground control points are used during the calibration process to help refine 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 PSLC King County Delivery Lidar data for the Puget Sound LiDAR Consortium between 02/24/16 and 05/25/17.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/37cf2ea00d7f468285f0c949149c612e_0engKing County GIS Open DataPublicRTK Ground Control Points for 2016 King County/Puget Sound Lidar Consortium Lidar Project [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)2016