Application of Extremely Low Altitude Photogrammetry for Monitoring Coastal Structuresby Richard B. Davis, Richard B. Davis Co, Inc, Smith River, United States,
Thomas R. Kendall, Richard B. Davis Co, Inc, Smith River, United States,
Abstract: Extremely low altitude mapping photography exposed from a helicopter is showing considerable promise in providing another method of extending the many benefits of photogrammetric data acquisition and measurement to coastal structures. The accuracy of the measurements obtained from this extremely low altitude photography is approximately twice that of normal stereo photography exposed at 1,200 feet above terrain. While more stereomodels are inherent with very low altitude photogrammetric projects, the ease and speed with which stereomodels can be set in modern analytical stereoplotters, coupled with the additional detail found in these low altitude photos, largely offsets this inconvenience.
Subject Headings: Photogrammetry | Photography | Aircraft and spacecraft | Coastal environment | Coastal protection structures | Mapping | Data collection | Terrain
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