Harris County Ortho-Photography Project

As part of a project being conducted by URS Corp to map the land-use change in Harris County, Texas (greater Houston), EDAC was contracted in 2011 to create an ortho-photo map of the county using aerial photography acquired in 1983.  At that time the National High Altitude Program acquired some 117 color IR photos over the area.  Photo transparencies were obtained from the USGS and scanned at 2,000 dpi.  The scanned photos were then rectified to the most recent photo base map for the county while using USGS 10 m spatial resolution DEMs for the elevation values.  The resulting ortho-photos were mosaicked together to create the 1983 ortho-photo map at 1 m spatial resolution.