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Washington County, NC 2009 Digital Orthos


Download Link: http://data.nconemap.gov/geoportal/catalog/raster/download.page
Abstract: This 2009 raster dataset is a combination of geo-referenced TIF and TFW world file format color orthophotography imagery at one of three resolutions covering Washington County, NC. The orthophotography dataset is comprised of a count of 53, 1"=100'scale tiles at 0.25-foot resolution, a count of 158, 1"=200' scale tiles at 0.5-foot resolution and a count of 110, 1"=400' scale tiles at 1.0-foot resolution. The Natural Color imagery conforms to NC Land Records Management Division Technical Specifications that were included in the Organizations' RFP. An orthophoto is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthophotography combines the image characteristics of a photograph with the geometric qualities of a map.The digital aerial photography was acquired for Washington County, NC at three flight altitudes and imagery resolutions. The 1"=100' scale ortho map areas were acquired at 2,500 feet above mean terrain and nominal 1/4 foot ground sample distance (GSD) resolution. The 1"=200'scale ortho map areas were acquired at 5,000 feet above mean terrain and nominal 1/2 foot ground sample distance (GSD) resolution. The 1"=400' scale ortho map areas were acquired at 10,000 feet above mean terrain and nominal 1 foot ground sample distance (GSD) resolution.The digital aerial imagery was acquired with a nominal 60% forwardlap and and nominal 30% sidelap between adjacent flight lines at a sun angle of 33 degrees or greater. The digital aerial imagery was captured at 12-bit radiometric resolution and converted to 8-bit radiometric resolution during the post processing of the raw imagery utilizing Intergraph Post Processing Software (PPS). The digital imagery was acquired utilizing two of Sanborns Intergraph DMC Digital Mapping Cameras serial numbers DMC01-046 and DMC01-109.The analytical aerial triangulation was completed utilize ImageStation Automated Triangulation software (ISAT) and the orthophotography images were rectified utilizing OrthoPro software, cubic convulution resampling method and the NC Flood Plain Mapping Program's bare earh LiDAR data. The color orthophotography digital images are available in uncompressed geo-referenced TIF and TFW format and as referenced compressed images at MrSID 1:10 and 1:30 ratios.The color orthophotography was referenced to the North Carolina State Plane Coordinate System, NAD 83/2007(NSRS) and the unit of measurement was the US Survey Foot, NAVD88. Direct GPS ties were made to numerious NCGS published control stations during the ground control and aerial photography acquisition tasks. Additional photo-identifiable GPS surveyed control points were also utilized to create and quality control the orthophotography images.
Purpose: The goal of this project is to provide Washington County, NC with 2009 color digital ortho imagery conforming to the project specifications.
Supplemental Information: Digital Aerial Photography Acquisition, Ground Control Surveying and Fully Analytical Aerial Triagulation Report dated June 26, 2009 and certified by Gary Eaton NC Professional Land Surveyor L-3192.
Publication Date: 20090823
Originator: Washington County Government
Online Linkage: http://www.nconemap.gov
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 20090223
Beginning Time: unknown
Ending Date: 20090331
Ending Time: unknown
Currentness Reference: 20090331 Date of source imagery acquisition
Status:
Progress: Complete
Maintenance and Update Frequency: Unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -76.869701
East Bounding Coordinate: -79.339777
North Bounding Coordinate: 36.011927
South Bounding Coordinate: 35.671748
Contact Organization: Washington County Government, IT Systems Director
Contact Electronic Mail Address: tesolen@washconc.org
Contact Voice Telephone: 252-793-2662
Contact Organization: Washington County Government, IT Systems Director
Horizontal Datum Name: North American Datum 83/2007
Planar Distance Units: US Foot
Ellipsoid Name: Geodetic Reference System of 1980
Map Projection Name: Lambert Conformal Conic
Distribution Liability: Washington County is responsible with the development and distribute of the county's corporate geographic database and in cooperation with othe state mapping organizations is committed to offering its user accurate, useful and current information about the county. The end user is responsible to review the data before using the data and bears the soul responsibity for the appropriate use of the information and ist content. See the Disclaimer http://www.washconc.org/gis_mapping/gis_mapping.htm
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