North Central Texas Council of Governments (NCTCOG) 20210929 Lidar point cloud Product: These lidar data are processed Classified LAS 1.2 files, formatted to 3,000ft x 2,000ft tiles in NAD 1983 State Plane Texas North Central FIPS 4202, US Foot. Geographic Extent: The North Central Texas Council of Government (NCTCOG) program is a multi-year contract to perform Photogrammetric, Surveying, and GIS services. The NCTCOG region includes 16 counties consisting of Dallas, Tarrant, Collin, Denton, Rockwall, Kaufman, Wise, Johnson, Hood, Erath, Hunt, Navarro, Ellis, Somervell, Palo Pinto, and Parker, which cover approximately 12,800 square miles. Dataset Description: 2021 NCTCOG Program Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.50 meter. The data was developed based on a horizontal projection/datum of NAD 1983 State Plane Texas North Central FIPS 4202, US Foot and vertical datum of NAVD88 (GEOID12B), US Foot. The final products include classified LAS, two (2) feet pixel raster DEMs of the bare-earth surface in ERDAS IMG Format, two (2) feet pixel raster DSMs in ERDAS IMG Format and 8-bit intensity images. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include hydrologic breakline data, control data, lidar processing report in PDF format, and FGDC metadata files for each data deliverable in .xml format. Ground Conditions: Lidar was collected between January 26, 2021 and February 7, 2021, while no snow was on the ground and rivers were at or below normal levels. NCTCOG’s goal is to develop and/or update certain geospatial data sets for use by local government agencies, other levels of government, academia, and the general public. Data from this project forms the foundation of the base map, and were developed primarily to support multi-use applications, including homeland security, emergency management, economic development, and the business of government. TASK NAME: 2021 NCTCOG Program, Woolpert Order No. 81643, CONTRACTOR: Woolpert USGS NGP Base Specifications v1.2 Leica Terrain Mapper 15 0.5 4 0.5 0.7 2500 150 40 116 1000 2.5 1 1064 1 0.25 varies 25 GEOID12B 0 N/A N/A 0.084 31 1.2 1 Geometrically unreliable points were identified using a combination of automated and manual techniques and subsequently classified as swath overlap and or noise. swath overlap points were identified in these files by adding 16 to the standard classification values 8 1 Processed but not classified 2 Bare earth ground 3 Low vegetation 4 Medium vegetation 5 High vegetation 6 Building 7 Noise 9 Water 10 Ignored Ground 17 Processed but unclassified points 18 Overlap points 20210126 20210207 ground condition Complete As needed -98.244279 -96.147963 33.491490 32.218086 None Lidar Classified Point Cloud None United States Texas Some restrictions apply. Ownership of the data products resides with NCTCOG. Use of NCTCOG Products. The Entity’s Authorized Users may Use the NCTCOG data product in the Licensed Operating Environment for any use that furthers the Entity’s internal operations or in furtherance of the Entity’s mission. Use of Generated Output or Other Data. Except as stated, the Entity will own all original works of authorship it may independently create. Digital output from the Entity’s Use of the NCTCOG Data Product may be resized as desired and printed on black and white, color printers, or map plotters. Such printed hardcopies may be distributed to the Entity’s officers, employees, citizens, contractors, or other persons in the regular course of business for their internal use or in connection with an actual transaction. Such printed output may be further copied, photographed, or reproduced digitally on the Internet. The Entity may charge a fee for such hardcopy printouts that exceed the actual direct cost of production. Without the prior written consent of NCTCOG, the Entity may not otherwise provide copied, digitized, reproduced, transmitted or disseminated, in whole or in part, any of the original digital data product in any form. All formatted data cover the entire area specified for this project and are validated using a combination of commercial lidar processing software, GIS software, and proprietary programs to ensure proper formatting and loading prior to delivery. 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 Vertical Accuracy specifications. LAS Swath Non-Vegetated Vertical Accuracy (NVA) Tested 0.084 Meters Non-vegetated vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using 0.043 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 and tested against the TIN using lidar ground points against 31 NVA points. LAS Point Classification: The point classification is performed as described below. The point cloud underwent a classification process to determine bare-earth points and non-ground points utilizing "first and only" as well as "last of many" lidar returns. This process determined Processed but not classified (Class 1), Bare earth ground (Class 2), Low Vegetation (Class 3), Medium Vegetation (Class 4), High Vegetation (Class 5), Buildings (Class 6), Noise (Class 7), Water(Class 9), Ignored Ground (Class 10), Processed but unclassified points (Class 17), and Overlap points (Class 18). The bare-earth (Class 2 - Ground) lidar points underwent a manual QA/QC step to verify the quality of the DEM as well as a peer-based QC review. This included a review of the DEM surface to remove artifacts and ensure topographic quality. Classification of water (class 9) was completed via the use of the hydrologic breaklines collected for the hydro-flattening phase. The overlap classes were determined by first identifying the overlapping areas and reclassifying the LAS data by offset from a corridor. This allows the returns located on the edge of the swath to be removed from the bare earth coverage in an effort to produce a more uniform data density. The returns determined to be overlap are then further classified to produce overlap default (class 17) and overlap ground (class 18). The surveyed ground control points are used to make vertical adjustments to the data set and to perform the accuracy checks and statistical analysis of the lidar dataset. Supervisory QC monitoring of work in progress and completed editing ensured consistency of classification character and adherence to project requirements across the entire project area. The resulting deliverables for this task order consist of classified LAS file in LAS 1.2 format, two (2) feet pixel size DEM files in ERDAS IMG format, two (2) feet pixel raster DSMs in ERDAS IMG Format, two (2) feet pixel size 8-bit Intensity files in GeoTIFF format, classified XYZ and Hydrologic Breakline data in ESRI GDB file format. 20210929 Woolpert, Inc. Geospatial Services mailing and physical address

4454 Idea Center Blvd.

Dayton OH 45430 USA (937) 461-5660 (937) 461-0743 8:00 a.m. to 5:00 p.m. Eastern Time Point StatePlane Texas North Central FIPS 4202 32.13333333333333 33.96666666666667 -98.5 31.66666666666667 1968500.0 6561666.666666666 coordinate pair 0.01 0.01 foot_us D North American 1983 GRS 1980 6378137.0 298.257222101 North American Vertical Datum of 1988(GEOID12B) 0.01 foot_us Explicit elevation coordinate included with horizontal coordinates North Central Texas Council of Governments GIS Project Coordinator mailing and physical address

616 Six Flags Dr.

Arlington TX 76011 USA 817.695.9156 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. 20210929 North Central Texas Council of Governments GIS Project Coordinator mailing

616 Six Flags Dr.

Arlington TX 76005 USA 817.695.9156 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time