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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Transactions of the ASAE. Vol. 44(6): 1903–1911 . (doi: 10.13031/2013.6978) @2001
Authors:   M. W. Veal, S. E. Taylor, T. P. McDonald, D. K. McLemore, M. R. Dunn
Keywords:   Global Positioning System (GPS), Precision forestry, Vehicle tracking, Forest engineering

This paper describes the results of a study that measured the accuracy of using GPS to track movement of forest machines. Two different commercially available GPS receivers (Trimble ProXR and GeoExplorer II) were used to track wheeled skidders under three different canopy conditions at two different vehicle speeds. Dynamic GPS data were compared to position data established through precision surveying techniques. Maps from data collected by both receivers showed general travel patterns of the skidders. Mean position errors in data collected by the GeoExplorer (2.75 m) were significantly greater than those of the data collected by the ProXR (1.34 m). When tested under different canopy conditions, GPS position accuracy showed a decreasing trend as the canopy changed from open to heavy. Finally, the machine speeds tested did not significantly affect the accuracy of GPS positions.

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