North Central Texas Council of Governments (NCTCOG)
20151017
Unknown
NCTCOG ORTHOIMAGERY
raster digital file
TASK NAME: 2015 North Central Texas Council of Government (NCTCOG) Digital Orthoimagery Project The North Central Texas Council of Governments (NCTCOG) program is a five year contract to perform Photogrammetric, Surveying, and GIS services. Woolpert is providing orthoimagery, LiDAR, and contour services for the 2015 project, the third year of this contract. 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. Products produced in 2015 were 4-band true orthophotos with a 0.5-foot ground sample distance (GSD). Microsoft UltraCAM Eagle was used with 100mm lens in non-restricted airspace and 210mm lens in restricted airspace. Woolpert produced true orthos in areas with buildings exceeding 60 stories located in the following central business districts: Dallas CBD, Fort Worth CBD , IH-635/I-75 intersection, Dallas North Tollway corridor from IH-635 to Keller Springs Parkway. The basic steps of true orthoimage generation include: Use existing, updated, or generate new 3D building features from LiDAR or manual 3-D compilation. DSM (bare earth and DBM) -based true orthophoto generation, shadow removal, and occlusion (image voids) refilling from multi-orthophotos, and the merging of the generated orthophoto into the base image data set. 60% sidelap is typically used to support the occlusion refilling.
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.
20150126
ground condition
As needed
-97.350402
-96.750169
32.992613
32.721824
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 Professional Version 6.1 (Build 7600); OrthoPro v6.1; Trimble Ortho Vista and Seam Editor v5.5; GeoMedia Professional v6.1
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” = 100’ scale mapping (±1.0-feet RMSE) .
The NCTCOG Orthoimagery Project was flown on January 26, 2015 at a minimum resolution of 6-inch. This task order covering approximately +/- 24 square miles. The imagery for this task order was acquired using the Microsoft UltraCAM Eagle capable of collecting 4-band imagery. All airborne GNSS and IMU data was post-processed and quality controlled using Grafnav Waypoint software and Applanix POSPac 5.4 software. GNSS data was processed at a 1 or 2 Hz data capture rate and IMU data was processed at 200 Hz. The data collected by Woolpert’s team was processed and quality controlled immediately.
20150104
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.
201502
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.
201502
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
coordinate pair
0.000000027839108796001713
0.000000027839108796001713
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
Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert, Inc. makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user’s sole risk.
20151017
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