Bohannan-Huston, Inc.
2009721
Unknown
NCTCOG 2009 Orthophotography
2009
raster digital data
NCTCOG 2009 Orthophotography
2009
Albuquerque, NM
Bohannan-Huston, Inc.
This data is part of an orthophotography update project covering specific areas in north central Texas. The project data are images which depict color aerial photographs. Lens and terrain distortion has been removed and tonal differences between adjacent images have been minimized to form a seamless mosaic of the individual areas. Orthorectified imagery is assumed to depict features at ground level, so above ground features may show elevation distortion. The only exceptions to this are bridges and elevated roads, which have been checked for distortion and manually replaced by their previous unrectified versions.
The orthophotography, ordered by the North Central Texas Council of Governments (NCTCOG), is intended to aid in engineering planning. It is not intended to furnish measurements accurate enough for engineering design work.
Neither the North Central Texas Council of Goverments (NCTCOG), nor Bohannan-Huston, Inc. (BHI) assumes liability for misuse of the data. Data should be used at the scale for which they were intended. No warranty, expressed, or implied, is made by the NCTCOG nor BHI regarding the utility of the data on any other system, nor shall the act of distribution constitute such warranty.
20090218
121817
20090317
103209
ground condition
None planned
-97.654224
-96.282334
33.432505
32.267627
ISO 19115 Topic Categories
imageryBaseMapsEarthCover
USGS Enterprise Web Thesaurus
aerial photographs
aerial photos
air photos
orthoimagery
orthophotographs
photography
remote sensing
Geographic Names Information System
US
Texas
None.
None.
Bohannan-Huston, Inc.
Dennis Sandin
Senior Vice President & Managing Principal
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.
The North Central Texas Council of Governments (NCTCOG) generously funded the creation of the entire dataset.
United States Department of Defense
Unclassified
None.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.0.1324
Source images are collected with a digital sensor with 4096 brightness values (12 bit) per band. Each image's histogram is clipped at high and low values to increase contrast, and then a digital dodge is performed in order to reduce vignetting of brightness and darkness trends across the frame.
Horizontal accuracy of all ground control visible in imagery shows a displacement of not more than 3 pixels (one and a half feet). Color balance is consistent across the project areas.
Aerotriangulation results for all raw imagery was checked for horizontal accuracy. All visible control points were checked in orthorectified imagery for horizontal accuracy. All bridges were checked for warping during the orthorectification process and corrected. All imagery was checked for consistency of color balance across all project areas. Twenty percent of mosaics were chosen at random for total visual inspection at full resolution to determine frequency of misplaced seamlines.
The horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process (elevation data, aerotriangulation control and methods, camera calibration, and source imagery parameters).
1.5
Control points that were used to aerotriangulate the positions of the images at time of exposure were identified in the orthorectified images and found to be displaced not more than three pixels. All other ground features therefore should not be displaced from their true locations by more than an average of three pixels. Features not on the ground, such as building rooftops or trees, may be displaced.
Surdex Corporation
Unpublished material
NCTCOG 2009 Orthophotography - Aerial Photography
remote-sensing image
PHOTO,EASTING,NORTHING,ELEVATION,OMEGA,PHI,KAPPA,DATE,TIME,SOURCE|
630074nava14,2524486.793,6620212.915,5352.144,0.5186,0.25031,88.85852,20070222,113541,3001|
630075nava14,2524484.299,6618738.292,5362.754,0.53529,0.3126,86.81009,20070222,113536,3001|
630076nava14,2524474.285,6617263.746,5374.251,0.65754,0.48739,85.72668,20070222,113531,3001|
12400
disc
20090218
121817
20090317
103209
ground condition
IMAGE
Raw image data was captured using an Intergraph Digital Mapping Camera (DMC) having a focal length of 120mm, an effective charge coupled device (CCD) array size of 168mm across track (left to right) by 95mm along track (top to bottom), and a pixel size in its panchromatic band of 12 by 12 microns.
Surdex Corporation
Unpublished Material
Airborne GPSIMU
tabular digital data
disc
ground condition
ABGPSIMU
Airborne GPS positions were computed by the acquisition company and used as control in the aerotriangulation process.
Bohannan-Huston, Inc.
Unpublished material
Aerotriangulation
disc
ground condition
AT
Aerotriangulation provides the exterior orientation parameters ( X, Y, Z, omega, phi, kappa) for input to the orthorectification process.
Bohannan-Huston, Inc.
Unpublished Material
Digital Elevation Model
raster digital data
disc
ground condition
DEM
Elevation data derived from a previous photogrammetry project was used as input to provide ground elevations for the orthorectification process.
Control panels were laid down and their positions recorded with static GPS. Positions were then corrected and network adjusted.
2009
Bohannan-Huston, Inc.
Dennis Sandin
Senior Vice President & Managing Principal
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.
Raw image data was captured using an Intergraph Digital Mapping Camera (DMC) having a focal length of 120mm, an effective charge coupled device (CCD) array size of 168mm across track (left to right) by 95mm along track (top to bottom), and a pixel size in its panchromatic band of 12 by 12 microns. Output images were created using post-processing software which removes lens distortion and pan-sharpens color data with a panchromatic image taken at the same instant. Each image had its histogram clipped to optimize contrast, and was sliced to reduce it from a 12 bit image (4096 values per band) to an 8 bit image (256 values per band).
2009
Surdex Corporation
mailing and physical address
501 Robert Blvd
Floor 2
Slidell
LA
70458
USA
636-532-3427
Airborne GPS/IMU data were collected in flight as images were captured and post-processed and network adjusted.
2009
Surdex Corporation
mailing and physical address
501 Robert Blvd
Floor 2
Slidell
LA
70458
USA
636-532-3427
Images were aerotriangulated to finalize their external orientation.
2009
Bohannan-Huston, Inc.
Dennis Sandin
Senior Vice President & Managing Principal
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.
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 four pixels.
2009
Bohannan-Huston, Inc.
Dennis Sandin
Senior Vice President & Managing Principal
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.
Images were color balanced and color corrected individually to ensure color consistent between flight lines and times of day.
2009
Bohannan-Huston, Inc.
Dennis Sandin
Senior Vice President & Managing Principal
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.
Images were mosaicked into seamless large images and extracted into the project tiling scheme.
2009
Bohannan-Huston, Inc.
Dennis Sandin
Senior Vice President & Managing Principal
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.
Images were checked for gaps, smears caused by missing surface, and these were fixed and re-created. Above ground features such as bridges warped by the orthorectification or excessive building lean were patched in with versions from unrectified photos. Obvious color differences that remained between source images were feathered. Twenty percent of images selected at random were reviewed at full resolution for any other issues.
2009
Bohannan-Huston, Inc.
Dennis Sandin
Senior Vice President & Managing Principal
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
Contact Mr. Sandin and he will put the caller in touch with the appropriate technical staff.
Metadata imported.
2009
0
Raster
G-polygon
2755
Lambert Conformal Conic
32.133333
33.966667
-98.500000
31.666667
1968500.000000
6561666.666667
coordinate pair
0.000000
0.000000
survey feet
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
NCTCOG 2009 Orthophotography
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
location
Shelley Broyles
North Central Texas Council of Governments
GIS Analyst
mailing address
P.O. Box 50888
Arlington
TX
76005-5888
USA
physical address
Centerpoint Two
616 Six Flags Dr Suite 200
Arlington
TX
76011
USA
817-695-9156
817-640-4428
These aerial photos for the year 2009 are available for purchase order over the Internet. They are in TIFF format which is a de facto imagery standard for most CAD and GIS software packages.
The North Central Texas Council of Governments (NCTCOG) provides these geographic data "as is" and makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. NCTCOG further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of Bohannan-Huston, Inc. (BHI) and served by NCTCOG, no warranty, expressed or implied, is made by NCTCOG or BHI regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall NCTCOG or BHI have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by NCTCOG.
TIFF
6.0
http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
Pixels of photographic data
no compression applied
70
DVD-ROM
4.7
Gibabytes
ISO 9660 with Rock Ridge Extensions
Call for current prices
http://www.dfwmaps.com/images/HowToOrder.pdf
http://www.dfwmaps.com/images/HowToOrder.pdf
2009
20080912
Dennis Sandin
Bohannan-Huston, Inc.
Geospatial Production Manager
mailing and physical address
7500 Jefferson St NE
Courtyard I
Albuquerque
NM
87109-4335
USA
505-798-7925
505-798-7932
dsandin@bhinc.com
8-5 M-Th 8-4:30 F (GMT -7)
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
200907201526550020090720