Digital Aerial Solutions, LLC Unpublished Material Erdas Imagine .img None Available None Available The Digital Elevation Model dataset consists of tiled LiDAR DEM Images. Each file contains a Raster Image of the Digital Elevation Model. 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. 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. The No Data Vaule for this raster data set is (-9999). Raster File Type = IMG Bit Depth/Pixel Type = 32-bit float Raster Cell Size = 1 Meter Interpolation or Resampling Technique = Bilnear Interpolation Required Vertical Accuracy = 19.6 cm NVA 20180306 20180313 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aware that temporal changes may have occurred since this data set was collected and that some parts of these data may no longer represent actual surface conditions.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. 0.100 DEM: Tested to be 0.100 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 0.051 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. 0.152 DEM: Tested 0.152 meters VVA at 95th percentile in all vegetated land cover categories combined using the absolute value 95th percentile error as defined by the National Standards for spatial Data Accuracy (NSSDA). The VVA of the Classified LiDAR point cloud was calculated against TINs derived from the final calibrated and controlled swath data using 95 VVA checkpoints located in the Brushlands, Trees, Tall Weeds and Crops land cover categories. Digital Aerial Solutions, LLC Unpublished Material 0800 Erdas Imagine .img None Available None Available None Available Portable Hard Drive 20180306 20180313 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. Bare-Earth DEM Creation: Bare-Earth Digital Elevation Models (DEMs) were derived using the hydro break line and bare-earth (ground) LiDAR points, all DEMs were created with a grid spacing of 1.0 Meters. The DEMs were cut to tiles of 1500 Meters X 1500 Meters index, provided by the US Geological Survey. 20180530 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. Raster Pixel 1500 1500 Universal Transverse Mercator 14N 0.99960000 -99.00000000 0.000000000 500000.000000000 0.000000000 Coordinate Pair 1 1 meters NAD83, National Reference System 2011 Geodetic Reference System 80 6378137.000000 298.255822101 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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None None None None None None None None None None None 20180913 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. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998