Kenney Aerial Mapping, Inc.
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Digital Photography
Semi-rectified digital imagery (also known as rubber sheeting or warping) is georeferenced and scaled to some type of ground control. The term geogreferencing refers to scaling the imagery and placing the image on a "real world" coordinate system.
Typical sources of control are USGS quadrangles, digital street networks, and standard aerial targets. Semi-rectified products are subject to unpredictable errors caused by camera tilt, lens displacement and irregularities in terrain, as well as the placement and accuracy of the ground control.
Digital Orthophotography
Digital Orthophotography, or fully rectified photography, differs from semi-rectified photography in two important ways. It requires photogrammetrically rigorous solutions similar to topographic mapping in terms of camera calibration, ground control and model orientation. More importantly, a DTM is applied to the imagery to remove the displacement effects of terrain variations so the final differentially corrected image is as accurate as a standard topographic map. We have been providing digital orthophotography to our clients since 1994.
Photogrammetric Services and Capabilities
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