Sanborn Map Company, Inc. 2011097 raster digital data This metadata record describes the 0.5' digital orthoimagery produced for the North Central Texas Council of Governments in 2011. The imagery was collected using Z/I DMC large format digital camera systems in January and February of 2011. The orthoimagery was produced using Sanborn's proprietary processing system. The orthoimagery is provided 4-band, 8-bits per pixel and in 2000' x 3000' tiles in uncompressed TIFF format and compressed MrSID format. Digital orthoimagery is provided to the NCTCOG and the participating agencies to serve as a basemap for GIS applications. The orthoimagery serves a variety of purposes such as planning, map production, and photo interpretation. The digital orthophoto can be used alone or as a raster basemap for corresponding vector line mapping. 20110119 20110121 20110122 20110124 20110126 20110127 20110128 20110213 ground condition Complete As needed -98.64606723 -96.18315325 33.47638407 32.14436653 NCTCOG aerial photography orthoimagery ortho orthophoto digital orthoimagery Texas Collin County Dallas County Denton County Ellis County Hunt County Kaufman County Kaufman County Rockwall County Tarrant County None None Shelley Broyles NCTCOG Senior Information Analyst mailing and physical address

616 Six Flags Drive

Arlington Texas 76005-5888 United States of America (817) 695-9156 (817) 640-4428 sbroyles@nctcog.org none Unclassified none Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 N/A 0 Digital orthoimagery does not contain inherent attribution. Compliance with the accuracy standard was ensured by the placement of GPS ground control prior to the acquisition of aerial imagery. The following checks were performed: 1. The ground control and airborne GPS/INS data stream were validated through an aerotriangulation bundle adjustment using Intergraph's ISAT software. 2. Digital orthophotography was validated through a visual inspection of control points, edge matching and general image quality. The following methods were used to ensure image quality: 1. Use of targeted ground control during image acquisition. 2. Use of GPS/INS during image acquisition. 3. Checking of controls against ortho product. 4. Post ortho accuracy approval checks for overall image quality (tone, color balance, etc.). This image complies with National Map Accurace Standards. 1.55 It has been tested at to have an RMS positional displacement within 1.55 feet of well defined ground features. Does not apply to vertical surface features, such as structures, appearing in the digital orthophotography due to inherent lean. There is no vertical accuracy for orthoimagery. Sanborn Map Company, Inc. 20110818 vector digital data disc 20110114 20110228 ground condition CONT Geodetic ground control is used to create a digital control file and control report as well as QC check of ortho accuracy. Predefined points within the project area are targeted and photo-identifiable locations are surveyed. The precise coordinates of these locations are used in the AT process and to check the horizontal accuracy of the resulting orthophotos. The control network established for this project consists of a total of 14 new stations and 34 existing stations, all of which were targeted. Sanborn Map Co., Inc. 20110818 vector digital data disc unknown 20110213 ground condition DEM The DEM was comprised of 10m USGS data and LiDAR point data and gridded to 10' spacing. The LiDAR data was supplied by NCTCOG and the Sanborn Map Company. At selected locations throughout the site, accurate GPS coordinates and elevations are surveyed. The points are marked with painted or plastic targets to ensure visibility of the location in the aerial photography. None 2011 CONT The Sanborn Map Company, Inc. Karen Adkins Project Manager mailing and physical address

1935 Jamboree Drive, Suite 100

Colorado Springs CO 80920 United States of America 719-593-0093 719-528-5093 kadkins@sanborn.com 8:00 AM to 5:00 PM, M-F New digital, color aerial imagery of the site is acquired using Intergraph DMC aerial camera systems. Airborne GPS/IMU data is recorded along with the imagery. None 2011 IMG The Sanborn Map Company, Inc. Karen Adkins Project Manager mailing and physical address

1935 Jamboree Drive, Suite 100

Colorado Springs CO 80920 United States of America 719-593-0093 719-528-5093 kadkins@sanborn.com 8:00 AM - 5:00 PM, M-F Imagery and GPS/IMU data is downloaded from disc on the plane to disc on the ground. GPS/IMU mission data is processed together with simultaneously collected ground-based GPS base station data in forward and reverse directions. This precisely determines the aerial camera's position and orientation in the terrain (project) coordinate system and allows for correct orientation of the imagery. IMG 2011 IMG The Sanborn Map Company, Inc. Karen Adkins Project Manager mailing and physical address

1935 Jamboree Drive, Suite 100

Colorado Springs CO 80920 United States of America 719-593-0093 719-528-5093 kadkins@sanborn.com 8:00 AM - 5:00 PM, M-F Using the processed GPS/IMU data and correctly oriented imagery, a bundle adjustment is computed (AT). IMG, CONT 2011 None The Sanborn Map Company, Inc. Karen Adkins Project Manager mailing and physical address

1935 Jamboree Drive, Suite 100

Colorado Springs CO 80920 United States of America 719-593-0093 719-528-5093 kadkins@sanborn.com 8:00 AM - 5:00 PM, M-F Orthorectified imagery is produced using Sanborn's proprietary software. Orthoimagery is rectified using the AT solution and DEM data. Once rectified, the orthoimagery is colorbalanced to the acceptable parameters established by NCTCOG. Orthoimagery is undergoes manual quality control to check for issues as outlined in the Digital Orthoimagery Acceptance Criteria document. Issues such as warps, smears, misalignments, etc. are corrected using proprietary and non-proprietary photo editing tools and software. Upon completion of the QC process, the orthos are provided to NCTCOG through Sanborn's web-based QA system, Geoserve, for NCTCOG's review. Any unacceptable orthoimagery is corrected and the final orthoimagery is then delivered to NCTCOG on hard drives in TIFF/TFW and SID/SDW formats. IMG, DEM 2011 OIMG The Sanborn Map Company, Inc. Karen Adkins Project Manager mailing and physical address

1935 Jamboree Drive, Suite 100

Colorado Springs CO 80920 United States of America 719-593-0093 719-528-5093 kadkins@sanborn.com 8:00 AM - 5:00 PM, M-F 5 Raster Pixel 4064 6064 1 Lambert Conformal Conic 32.133333 33.966667 -98.500000 31.666667 1968500.000000 6561666.666667 coordinate pair 0.5 0.5 survey feet North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.5 US Feet Implicit coordinate Color orthophotos are comprised of pixels. Each pixel is assigned a value of 0 to 255. That number will refer to a color look-up table which contains red, green and blue (RGB) values, each from 0 to 255, for that pixel within the image. Near infrared band comprises the 4th band of the 4-band RGB+NIR imagery. None Shelley Broyles North Central Texas Council of Governments Senior Information Analyst mailing and physical address

616 Six Flags Drive, Suite 200

Arlington Texas 76005-5888 United States of America (817) 704-2519 (817) 640-4428 sbroyles@nctcog.org Contact NCTCOG Contact NCTCOG unknown 2011097 NCTCOG Shelley Broyles Senior Information Analyst mailing and physical address

616 Six Flags Drive, Suite 200

Arlington Texas 76005-5888 United States of America (817) 704-2519 (817) 640-4428 sbroyles@nctcog.org 0800-1700 CST, M-F FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time none none none Unclassified none http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile