An Inexpensive Photogrammetry System for Obtaining 3-D Spatial Coordinates in Dynamic Testing Conditions
A method is described for obtaining three-dimensional spatial coordinates of moving points of interest during dynamic field testing of timber harvesting machinery. The system described makes use of an inexpensive photogrammetry scheme coupled with a small digital computer and digitizing board for data reduction. The photogrammetry equipment is constructed from 35-mm cameras with automatic, motor-driven film advancers. The data reduction techniques described allow for flexible placement of the equipment in the field, arbitrary photography enlargement, and arbitrary positioning of the photographs on a digitizing board. The computer techniques described also allow the spatial coordinates of a point of interest to be obtained in any rotated Cartesian system. The system has a total accuracy of about ±3 percent for spatial coordinates from a few feet to several hundred feet. Forest Sci. 29:341-350.
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Document Type: Journal Article
Affiliations: Project Leader, George W. Andrews Forestry Sciences Laboratory, Southern Forest Experiment Station, Auburn, AL 36830
Publication date: 1983-06-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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