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An Inexpensive Photogrammetry System for Obtaining 3-D Spatial Coordinates in Dynamic Testing Conditions

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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.

Document Type: Journal Article

Affiliations: Project Leader, George W. Andrews Forestry Sciences Laboratory, Southern Forest Experiment Station, Auburn, AL 36830

Publication date: June 1, 1983

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