Surdex Corporation 2021 Unknown Douglas County:City of Lawrence DEM raster data A 3.0 feet cell size Digital Elevation Model (DEM) raster was created from the ground classified lidar points plus the breaklines for the County's QL2 data set while a cell size of 1.0 foot was created for the City in their QL1 area. The files are delivered in ISGS tile format (3,072ft by 3,072ft), The rasters are delivered in GeoTIFF format. To acquire detailed surface elevation data for the County of Douglas, Kansas and the City of Lawrence, Kansas. 20210121 unknown 20210123 unknown ground condition Complete Unknown -95.502042 -95.055523 39.069932 38.737985 none lidar dem breaklines none Douglas Kansas none 2021 Unknown Unknown County of Douglas Bryce Hirschman GIS Coordinator, Douglas County GIS mailing address
Douglas County
1100 Massachusetts St.
Lawrence KS 66044 (785) 838-2422 bhirschman@douglascountyks.org Microsoft Windows 10 Service Pack 1; ESRI ArcCatalog 10.6.1 Verification of attribute accuracy for lidar data involves the use of filtering techniques. Auto-filtering uses algorithms to reclassify data in the point cloud. Hand-filtering involves the analysis of a technician working in a graphic environment to reclassify the erroneous points that may remain in the lidar point cloud after auto-filter. Calibrations of the LiDAR flightline data are performed; this process is known as boresighting. The flightlines are compared to evaluate both their relative and absolute accuracies. The dataset was reviewed to ensure completeness and accuracy. This data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 24.47cm RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 42.35cm at a 95% confidence level. This data set was tested to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10.0-cm RMSEz Vertical Accuracy Class. Actual NVA accuracy was found to be RMSEz = 2.726cm, equating to +/- 5.344cm at the 95% confidence level. Actual VVA accuracy was found to be +/- 14.888cm at the 95th percentile. Surdex 2021 Unknown Lidar checkpoints spreadsheet LIDAR checkpoints LIDAR checkpoints Chesterfield, MO Surdex 1200 disc 2021 ground condition Lidar checkpoints Minimum 30 NVA checkpoints, 20 VVA checkpoints Surdex Corporation 2021 Unknown Lidar LAS data LIDAR LIDAR Chesterfield, MO Surdex Corporation 1200 disc 2021021 unknown 20210123 unknown ground condition Lidar ASPRS LAS 1.4 QL2 specifications, two points per square meter. Using ESRI software a 3.0 foot DEM ESRI Grid file was created using the ground classified lidar points along with the breaklines. The files are delivered in 3,072 ft by 3,072 ft tiles. 20210503 Jim Gottgetreu Surdex Project Manager mailing and physical address
520 Spirit of St. Louis Blvd.
Chesterfield MO 63005 636-368-4400 jimg@surdex.com Raster Pixel coordinate pair 1 1 feet State Plane Coordinate System 1983 1501 0.9999411764705882 -98.00000 38.333333 1312333.333333 0.00000 NAD_1983_StatePlane_Kansas_North_Ft_US Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988,Geoid2018 1 feet Explicit elevation coordinate included with horizontal coordinates DEM DEM Surdex 3.0 foot cell size Digital Elevation Model (DEM) 3.0 foot cell size Digital Elevation Model (DEM) 20210522 Jim Gottgetreu Surdex Project Manager mailing and physical address
520 Spirit of St. Louis Blvd.
Chesterfield MO 63005 636-368-4400 jimg@surdex.com FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile