Woolpert 20180228 Raster Digital Data Product: These are Digital Elevation Model (DEM) data for TN West Central Lidar 2017 B17 as part of the required deliverables for TN West Central Lidar 2017 B17 project. Class 2 (ground) lidar points in conjunction with the hydro breaklines and bridge breaklines were used to create a 2.5 feet hydro-flattened Raster DEM. Geographic Extent: This task order requires lidar data to be acquired over 5,735 square miles in Stewart, Henry, Benton, Houston, Carroll, Humphreys, Henderson, Perry, Decatur, Hardin and Wayne counties in TN. Dataset Description: TN West Central Lidar 2017 B17 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2. The data was developed based on a horizontal projection/datum of Tennessee State Plane Zone NAD83(2011), US Feet and vertical datum of NAVD88 Geoid12B US Feet. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 5710 individual 7000 ft x 4000 ft tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 7000 ft x 4000 ft schema. Ground Conditions: Lidar was collected in spring of 2017 by Woolpert, while no snow was on the ground and rivers were at or below normal levels. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Woolpert established 177 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. Additional independent accuracy checkpoints were collected (156 NVA points and 101 VVA points) and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. Data is used for: Terrain analysis, drainage studies, planning and development Raster File Type = IMG Bit Depth/Pixel Type = 32-bit float Raster Cell Size = 2.5 US Feet Interpolation or Resampling Technique = Triangulated Irregular Network Required Vertical Accuracy = 19.6 cm NVA 20170303 20171029 ground condition Complete None planned -88.744878 -87.472384 36.690311 34.977056 1163503 1527503 861378 245378 None Model Raster DEM Elevation Data Lidar None United States Tennessee Stewart Henry Benton Houston Carroll Humphreys Henderson Perry Decatur Hardin Wayne No restrictions apply to this data. None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and within the limitations of the data for which it was requested and prepared, in general, and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data. It is not appropriate to use the related graphics as data. Woolpert gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from a Woolpert server, and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully upon Woolpert’s computer system, no warranty, expressed or implied, is made regarding the utility of the data on another system, or for general or scientific purposes; nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data. Data covers the entire area specified for this project. These LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications. LAS data covering the TN West Central Lidar 2017 B17Lidar Task Order was compared to independent survey control points to determine the NVA of the LAS Swath and of the Bare-Earth DEM. In addition, this LAS data was compared to independent VVA points. LAS Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.068 Meters Non vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.035 Meters (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. Bare-Earth DEM Non-Vegetated Vertical Accuracy (NVA) Tested 0.072 Meters Non vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.037 Meters (RMSEz) x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines. 0.070 Raw Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.070 Meters Non vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (RMSEz)0.035 meters x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the TIN using all lidar points against 156 NVA points. 0.072 Bare-Earth DEM Non-Vegetated Vertical Accuracy (NVA) Tested 0.072 Meters Non-Vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (RMSEz) 0.037 meters x 1.96000 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM against 156 NVA points. 0.186 Vegetated Vertical Accuracy (VVA) Tested 0.186 Meters at the 95th percentile reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines and tested against the DEM against 101 VVA points. VVA Errors larger than 95th percentile include: Point 3017, Easting 1268005.34, Northing 369500.72, Z-Error 0.259 Meters Point 3020, Easting 1444011.97, Northing 357280.84, Z-Error 0.186 Meters Point 3023, Easting 1338832.66, Northing 462132.60, Z-Error 0.186 Meters Point 3024, Easting 1335362.25, Northing 483591.33, Z-Error 0.198 Meters Point 3071, Easting 1346681.31, Northing 519255.34, Z-Error 0.478 Meters Point 3073, Easting 1222004.75, Northing 526976.00, Z-Error 0.186 Meters Hydro Flattened Raster DEM Process: Class 2 (ground) lidar points in conjunction with the hydro breaklines as well bridge breaklines were used to create a 2.5 ft hydro-flattened Raster DEM. Using automated scripting routines within ArcMap, an ERDAS Imagine IMG file was created for each tile. Each surface is reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface. 20170303 Raster State Plane Coordinate System 1983 4100 35.25 36.4166666667 -86.0 34.3333333333 1968500.0 0.0 row and column 2.5 2.5 Ft US D_NAD_1983_2011 GRS_1980 6378137.0 298.257222101 North American Vertical Datum of 1988(GEOID12B) 0.01 Ft US Explicit elevation coordinate included with horizontal coordinates 20180228 Woolpert mailing and physical address

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