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 Complete 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