Sanborn Map Company, Inc.
2011097
NCTCOG_2011
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
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
Ground Control Survey
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
Digital Elevation Model
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