Classifed LAS, TX Eastern Texas LiDAR

Digital Aerial Solutions, LLC Unpublished Material Classifed LAS, TX Eastern Texas LiDAR .LAS Lidar format None Available None Available The Project data set consists of the RAW Point Clouds, Classified Point Cloud, Hydro Breaklines, Intensity Images, Digital Elevation Model, Digital Surface Model, and Mosaics. The Geographical Extent of this dataset extends to the entirety of the TX Eastern Texas LiDAR Project boundary, approximately 5755 square miles of the AOIs. Ground Conditions: water at normal levels; no unusual inundation; no snow; leaf off How the Withheld Points are Identified: Withheld (ignore) points were identified in the files using the standard LAS Withheld bit. ANPS: 0.63 Meters Tile Size: 1,500 km Spec: National Geospatial Program(NGP) Lidar Base Specification v1.3 LAS File Type: 1.4 type 6 The USGS/NRCS contracted Digital Aerial Solutions, LLC to obtain professional services related to the planning, acquisition and development of Light Detection and Ranging (Lidar) data and derivative products. The task order is for a QL2 Lidar survey to be collected over Leon, Washington, Sabine, San Jacinto, Shelby, Grimes, Lee, Madison, Milam, Trinity and Newton county in TX. The deliverable products would be used by the USGS/NRCS for conservation planning, design, research, floodplain mapping, wetlands identification, dam safety assessments, hydrologic modeling, and other environmental purposes. All Lidar data and associated products were acquired, calibrated, and used in the creation of Lidar derived products by Digital Aerial Solutions, LLC. U.S. Geological Survey (USGS) - National Geospatial Program(NGP) Lidar Base Specification v1.3 Leica ALS80 SN# 8137 Unlimited 0.63 2.5 0.63 2.5 2177 155 15 56.5 257.0 4 0.55 1064 1 0.15 1289.72 30 National Geodetic Survey (NGS) Geoid 12B 0.783 0.098 130 0.098 130 0.144 95 1.4 6 Withheld (ignore) points were identified in the files using the standard LAS Withheld bit. Swath “overage” points were identified in these files using the standard LAS overlap bit. 16 1 Undetermined/Unclassified 2 Bare earth 7 Low Noise 9 Water 17 Bridges 18 High Noise 20 Ignored Ground 20180308 20180319 ground condition Complete As needed -97.313538 -93.498949 32.000894 30.045968 660000.000000 789000.000000 3499500.000000 3325500.000000 None Elevation Data Lidar Hydrology DEM Intensity Image None Leon Washington Sabine San Jacinto Shelby Grimes Lee Madison Milam Trinity Newton TX No restrictions apply to this data the data represented is the result of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose. None. However, users should be aware that temporal changes may have occurred since this data set 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 the limitations of the data. Acknowledgment of the US Geological Survey would be appreciated for products derived from these data.The data represented is the result of data collection and processing per contract specifications and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose. Inertial Explorer ver: 8.6; Leica CloudPro Ver:1.2.1; GeoCue Ver: 2014.1.21.4; Microstation V8i; Terresolid ver: 2015; LP360 ver: 2014.1.51.1; Arcmap ver: 10.4; Global Mapper ver: 16 Aerial LiDAR data covers the entire 676 square mile Area of Interest intended for this project task. All LiDAR Point Cloud tiles show no edge artifacts or mismatches from tile to tile. Void areas (i.e., areas outside the project boundary but within the tiling scheme) are coded using a unique “NODATA” value. This value is identified in the appropriate location within the file header. Data cover the entire area specified for this project. All Accuracies specified are referring to the final accuracies which fully comprise of the entire project area. The RAW LAS data files included 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 Fundamental Vertical Accuracy specifications. Void areas (i.e., areas outside the project boundary but within the tiling scheme) are coded using a unique “NODATA” value. This value is identified in the appropriate location within the file header. Horizontal error in lidar derived elevation data is largely a function of positional error as derived from the Global Navigation Satellite System (GNSS), attitude (angular orientation) error (as derived from the INS) and flying altitude; and can be estimated based on these parameters. 0.783 This data set was produced to meet ASPRS “Positional Accuracy Standards for Digital Geospatial Data” (2014) for a 0.226 Meters RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy =+/- 0.783 Meters at a 95% confidence level Estimated LiDAR Horizontal Error Per Point. Vertical Accuracy of the bare-earth lidar data was assessed and reported in accordance with the ASPRS Positional Accuracy Standards for Digital Geospatial Data; Two Hunderd Twentyy-Five (225) surveyed points were measured for the purpose of assessing the accuracy of the TX Eastern Texas LiDAR data (130 NVA + 95 VVA). Both data sets, Lidar and Digital Elevation Models (DEMs) have been tested for there individual vertical accuracy levels. The Lidar was tested by using interpolation while the DEMs where tested by extracting the elevation of a pixel containing the checkpoint. All DEM Vertical accuracy results are reported in the DEM Metadata reports while this project wide Metadata file is reporting the vertical accuracy results from the the source Lidar. Required Non Vegetated Vertical Accuracy (NVA): 0.196 Meters. Required Vegetated Vertical Accuracy (VVA): 0.294 Meters. 0.098 Classified LiDAR: Tested to be 0.098 meters NVA at 95-percent confidence level using RSME(z) x 1.9600 as defined by the National Standards for spatial Data Accuracy (NSSDA). The root mean square error vertical (RMSEz) was computed to be 0.050 meters. The NVA of the Classified LiDAR point cloud was calculated against TINs derived from the final calibrated and controlled swath data using 130 NVA checkpoints located in Bare Earth land cover class. Digital Aerial Solutions, LLC Unpublished Material 0800 Classifed LAS, TX Eastern Texas LiDAR .LAS Lidar format None Available None Available None Available Portable Hard Drive 20180308 20180319 ground condition TX Eastern Texas LiDAR This data source was used (along with the airborne GPS/IMU Data) to georeferencing of the lidar point cloud data used to create all contracted Lidar derived products. Version of the LAS Standard 1.4 / point data record format 6. Aerial LiDAR Acquisition: Aerial data collection was acquired, in Fourty-One (41), using the Leica ALS80 SN# 8137 and SN# 8235 at an altitude of 7142 feet AGL for QL2. This was to support a 2.0 ppm^2 for QL2 LiDAR point cloud. Airborne GPS and IMU data was collected during the acquisition and supported by Leica GS15 and GPS 1200 base stations that occupied temporary monuments in conjunction with CORS stations, Data acquisition started March 06, 2018 and it was completed March 21,2018. Ground Control Survey: A survey was performed to support the acquisition of Light Detection and Ranging (LiDAR). The control network involved a total of Two Hunderd Twentyy-Five (225) check points (130 NVA + 95 VVA). The points were a combination of the following ground cover classification: Open Terrain, Urban Terrain, Bare Earth, High Grass, and Low Trees. All field survey observations were conducted between March 09, 2018 and it was completed March 18, 2018 with Leica GPS GS15 and 1200 equipment. 20180306 Digital Aerial Solutions, LLC Josh Helton VP/Assistant General Manager mailing and physical address

4027-A Crescent Park Drive

Riverview FL 33578 United States 813-628-0788 813-628-0777 jhelton@digitalaerial.com Monday through Friday 8:00 AM to 4:00 PM (Eastern Time) If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours. LiDAR Post-processing: The calibrated and controlled LiDAR swaths were processed using automatic point classification routines in TerraSolid software. These routines operate against the entire collection (all swaths, all lifts), eliminating character differences between files. Data were then distributed as virtual tiles to experienced LiDAR analysts for localized automatic classification, manual editing, and peer-based QC checks. Supervisory QC monitoring of work in progress and completed editing ensured consistency of classification character and adherence to project requirements across the entire project. All classification tags are stored in the original swath files. After completion of classification and final QC approval, the NVA and VVA for the project are calculated. Sample areas for each land cover type present in the project were extracted and forwarded to the client, along with the results of the accuracy tests. Upon acceptance, the complete classified LiDAR swath files were delivered to the client. 20180511 Digital Aerial Solutions, LLC Josh Helton VP/Assistant General Manager mailing and physical address

4027-A Crescent Park Drive

Riverview FL 33578 United States 813-628-0788 813-628-0777 jhelton@digitalaerial.com Monday through Friday 8:00 AM to 4:00 PM (Eastern Time) If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours. Point Point Universal Transverse Mercator 15N 0.99960000 -93.00000000 0.000000000 500000.000000000 0.000000000 Coordinate Pair 0.01 0.01 meters NAD83, National Reference System 2011 Geodetic Reference System 80 6378137.000000 298.257222101 North American Vertical Datum of 1988 (Geoid12B) 0.001 meters Explicit elevation coordinate included with horizontal coordinates None None None None None None

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4027-A Crescent Park Drive