North Central Texas Council of Governments (NCTCOG) 20171115 Unknown raster digital file TASK NAME: 2017 North Central Texas Council of Government (NCTCOG) Digital Orthoimagery Project. The North Central Texas Council of Government (NCTCOG) program is a five year contract to perform Photogrammetric, Surveying, and GIS services. The NCTCOG region includes counties: Collin, Denton, Dallas, Ellis, Erath, Hood, Hunt, Johnson, Kaufman, Navarro, Palo, Pinto, Parker, Rockwall, Somervell, Tarrant, and Wise. The 2017 NCTCOG orthoimagery project consisting of 2,000' x 3,000' (named according to the NCTCOG naming convention) uncompressed 8-bit, 4-band color GeoTIFF files. Products produced were 4-band, 8-bit orthophotos with a 0.25-foot ground sample distance (GSD). Additional deliverables include countywide Multi resolution Seamless Image Database - MrSID imagery (Generation 2 and 4) and project level FGDC Compliant Metadata. 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. 20170123 20170130 ground condition Complete As needed -98.592883 -95.542825 33.611592 31.666461 None Raster Orthophoto 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. North Central Texas Council of Governments GIS Project Coordinator mailing

616 Six Flags Dr.

Arlington TX 76005 USA 817.695.9156 Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959 All formatted data are validated to ensure proper formatting and loading prior to delivery. The dataset is complete. The orthoimagery meets ASPRS Class I Accuracy Standards for 1” = 50’ scale mapping (±0.5-feet RMSE) . The 2017 NCTCOG orthoimagery project (3-inch) was acquired from January 23, 2017 through January 30, 2017 at a minimum resolution of 3-inch using the Microsoft UltraCAM. The aerial imagery was captured to produce orthoimagery at 1” = 50’ scale with a 3-inch pixel resolution. The acquired data was processed and quality controlled immediately. 20170123 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 Images were aerotriangulated to finalize their external orientation. Intergraph ISAT and GeoMedia Pro were used to perform digital point matching/mensuration/block adjustments and quality control queries respectively. 20170130 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 Images were orthorectified to remove distortions caused by changes in the elevation of the terrain. The orthorectification process used an exponential interpolation method and a ground elevation sampling interval of sixteen pixels from DEM surfaces that were reprojected and translated to the desired format for the process. All orthorectified images were clipped to provide the most nadir areas with sufficient overlap for quality mosaicking. The exception was areas of true orthorectification and large highway interchanges in which full frame rectification was used. Intergraph Imagestation OrthoPro was the software used for the orthorectification. Images were color balanced and color corrected individually to ensure color consistency between flight lines, times of day, and dates of capture. Images were mosaiced into large aggregate tiles. Automatic seamlines using the feature detection method and shapefiles of building outlines were used to combine the most nadir components of individual images. Aggregate tiles were again tonally balanced and color corrected with the entire project in view. A second global color adjustment was performed to minimize color changes across images and checked for consistency of color balance across the entire project area. Project deliverable tiles were cut from the mosaic and formatted for delivery. Trimble OrthoVista, Seam Editor, GeoMedia Pro was the software used to perform these steps. 20170130 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 Raster NAD 1983 StatePlane Texas North Central FIPS 4202 Feet 32.13333333333333 33.96666666666667 -98.5 31.66666666666667 1968500.0 6561666.666666666 row and column 0.25 0.25 foot_us D North American 1983 GRS 1980 6378137.0 298.257222101 North Central Texas Council of Governments GIS Project Coordinator mailing

616 Six Flags Dr.

Arlington TX 76005 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 Woolperts 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. 20171115 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