Bohannan-Huston, Inc. December 2008 Unknown 2008 raster digital data 2008 DRCOG Digital Aerial Orthoimagery 2008 Albuquerque, NM and Englewood, CO Bohannan-Huston, Inc. http://www.drcog.org/drapp This image tile is part of an orthophotography project covering contiguous areas of interest in and adjacent to the jurisdictional boundary of the Denver Region Council of Governments (DRCOG) in central Colorado. The project is known as the Denver Region Aerial Photography Project (DRAPP) begun and completed in 2008. The tiles are images which depict color digital aerial photographs acquired in the spring of 2008 during leaf-off conditions and in early summer of 2008 over mountainous areas to minimize snow cover. Lens and terrain distortion have been removed and tonal differences between adjacent images have been minimized to form a mosaic of the entire project area. The project area includes The Denver Metropolitan area and both eastern plains and western mountains adjacent to the metro area. Orthorectified imagery is assumed to depict features at ground level, so above ground features may show some distortion from elevation. The only exceptions to this are bridges and elevated roads, which have been checked for distortion and manually replaced by their previous unrectified versions. Each orthorectified pixel is exactly one half foot square in the metro area and one foot square in the plains and mountain areas. Quality and accuracy of this orthophotography was evaluated independently. The image products conform to American Society for Photogrammetry and Remote Sensing (ASPRS) Class I Standards for 1"=200' horizontal mapping. Project coordinate systems were based off the Colorado State Plane Central Zone projection with the horizontal datum North American Datum 1983 (HARN) and vertical datum North American Vertical Datum 1988 and units of US Survey Feet. Transformed projections and datums available in this project include; Colorado State Plane Central Zone NAD83, US Feet; Colorado State Plane North Zone NAD83 (HARN) , US Feet; Colorado State Plane North Zone NAD83, US Feet; and Universal Transverse Mercator Zone 13 NAD83, Meters. The orthophotography is useful as a layer in a Geographic Information System (GIS) and is intended to aid in planning, digital map revision, and spatial analysis. It is not intended to furnish measurements accurate enough for engineering design work. The orthophotography is also available in compressed JPG 2000 and MrSID file formats. Also available are compressed and uncompressed formats supporting 4-band data constructs. 20080314 100000 20080630 140000 ground condition Complete None planned -106.086598 -103.656978 40.786236 39.084678 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 Colorado Denver County Jefferson County Broomfield County Weld County Douglas County Boulder County Adams County Arapahoe County Clear Creek County Gilpin County Gilpin County Grand County Denver Regional Council of Governments None. Neither the DRCOG, 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 DRCOG nor BHI regarding the utility of the data on any other system, nor shall the act of distribution constitute such warranty. 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. A consortium of 53 governmental and private partners headed by the Denver Regional Council of Governments. United States Department of Defense Unclassified None. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.0.1324 This raster data set contains no attribute data. Horizontal accuracy of all ground control visible in imagery shows a displacement of not more than three pixels (one and a half feet). Color balance is consistent across the project. 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 the entire project area. Twenty percent of final tiles were chosen at random for total visual inspection at full resolution to determine frequency of misplaced seamlines and other potential quality issues. Independent data acceptance testing was completed by IntraSearch/Mapmart located in Greenwood Village, CO and included accuracy testing, visual inspection, and conformance to predefined acceptance criteria. 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). These parameters are reviewed post orthorectification against the output imagery and initially validate the product is in compliance with ASPRS standards. Additionally, NSDI Part 3 Chapter 3 - (http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy/part3/chapter3) outlines process for determining horizontal RMSE and 95% confidence level for accuracy. Data deemed useful for this validation include independent higher accuracy geodetic control, GPS ground surveys, photogrammetric methods, and databases of high accuracy point coordinates. Check point locations are generally distributed more densely in the vicinity of important features and more sparsely in areas that are of little or no interest. This data set has uniform positional accuracy thus the points are spaced so 20% of the check points are located in each quadrant of the dataset. A complete accuracy test and certification was performed by IntraSearch/Mapmart and is available from DRCOG. 1.5 ASPRS Class 1 Mapping Standards for 1"= 200' horizontal require an RMSE of 2.0' be achieved. 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. Vertical accuracy does not apply to the orthophotography data set. Bohannan Huston Inc and Surdex Inc. Unpublished Material remote-sensing image 12700 disc 20080314 100000 20080630 140000 ground condition IMAGE Raw image data was captured using an Zeiss/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 tabular digital data n/a disc 20080314 100000 20080630 140000 ground condition ABGPSIMU Airborne GPS positions and Intertial Measurement Unit attitudes were computed by the acquisition company and used as control in the aerotriangulation process. Bohannan-Huston, Inc. Unpublished Material n/a disc 20080615 073000 20081117 173000 ground condition Aerial Triangulation Bundle Adjustment Aerotriangulation provides the exterior orientation parameters ( X, Y, Z, omega, phi, kappa) for input to the orthorectification process. Bohannan-Huston, Inc. Unpublished Material raster digital data vector point data, gridded point three dimensional coordinates disc 20080706 080000 20081125 180000 ground condition DEM Elevation data derived from the same aerial photography, autocorrelated and filtered, existing surface information was used as input to provide ground elevations for the orthorectification process. The DEM data (elevation data) should not be used for detailed landscape or terrain analysis, hydrologic drainage enforcement or other hydrologic or other watershed analysis. Ground Control targets (panels) were laid down at predetermined locations and their positions recorded with static GPS. Positions were then corrected and network adjusted via the federal government Online Positioning User System (OPUS) to the project coordinate system. Project coordinate systems were based off the Colorado State Plane Central Zone projection with the horizontal datum North American Datum 1983 (HARN) and vertical datum North American Vertical Datum 1988 and units of US Survey Feet. Transformed projections and datums used in this project include; Colorado State Plane Central Zone NAD83, US Feet; Colorado State Plane North Zone NAD83 (HARN) , US Feet; Colorado State Plane North Zone NAD83, US Feet; and Universal Transverse Mercator Zone 13 NAD83, Meters. 2008 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). 2008 Surdex Corporation John Boeding mailing and physical address

520 Spirit of St. Louis Blvd.

Chesterfield MO 63005 USA 636-368-4400 Airborne GPS/IMU data were collected in flight as images were captured and post-processed and network adjusted. 2008 Surdex Corporation John Boeding mailing and physical address

520 Spirit of St. Louis Blvd.

Chesterfield MO 63005 USA 636-368-4400 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. Final block adjustments were evaluated at sub pixel accuracy. June to October 2008 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 thirty two pixels. Intergraph ISBR was employed for the orthorectification. July - November 2008 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 consistency between flight lines, times of day, and dates of capture. July - November 2008 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 mosaiced into large aggregate tiles and automatic seamlines were used to combine the most nadir components of individual images. July - November 2008 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. 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. Project deliverable tiles were cut from the mosaic and formatted for delivery. September-December 2008 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. September - December 2008 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 rectified mosaicked imagery were cut into smaller PLSS based quarter tile sections approximately 2700ft by 2700ft tiles. August-December 2008 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. C:\Documents and Settings\dsandin\Desktop\Metadata\drapp08\DRAPP 2008 orthophotography-centralnad83harn.xml less than 5% GeoTIFF header Vector G-polygon 7183 Transverse Mercator 0.999900 -106.250000 31.000000 1640416.666667 0.000000 coordinate pair 0.000000 0.000000 survey feet North American Datum of 1983 (HARN) Geodetic Reference System 80 6378137.000000 298.257222 n/a 0.000000 Explicit elevation coordinate included with horizontal coordinates halloween FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Id Matthew Krusemark Customer Resource and Support Division, Geospatial Team DRAPP 2008 Program Manager, Geospatial Team Manager mailing address

1290 Broadway, Suite 700

Denver CO 80203 USA geospatial@drcog.org These aerial photos for the year 2008 are available for sale online through Mapmart, a Division of Intrasearch Inc. at: http://www.mapmart.com The Denver Regional Council of Governments (DRCOG) is furnishing these geographic data on an "as is" basis, and DRCOG makes no guarantee, representation or warranty concerning the accuracy or completeness of information contained in the geographic data. DRCOG further makes no guarantees, representations or warranties, either expressed or implied, as to any other matter whatsoever concerning the data and product, including, without limitation, the condition of the product, or its fitness for any particular use or 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 DRCOG, no guarantee, representation or warranty, either expressed or implied, is made by DRCOG or BHI regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such guarantee, representation or warranty. In no event shall DRCOG 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 DRCOG. TIFF 6.0 http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf Pixels of photographic data no compression applied 82 DVD-ROM 4.7 Gibabytes ISO 9660 with Rock Ridge Extensions External Hard Drive >100Gb Gigabytes Microsoft NTFS and/or FAT Call for current prices 2009 20090216 Dennis Sandin Bohannan-Huston, Inc. Vice President mailing and physical address

7500 Jefferson St NE

Courtyard I

Albuquerque NM 87109-4335 USA 505-798-7925 505-350-4331 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 200902261236460020090226