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Accuracy Assessment of Perimeter and Area Calculations Using Consumer-Grade GPS Units in Southern Forests
Faculty Publications
  • Daniel Unger, Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University
  • I-Kuai Hung, Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University
  • Yanli Zhang, Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University
  • Jeffrey Parker
  • David Kulhavy, Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University
  • Dean W. Coble, Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University
Document Type
Article
Publication Date
1-1-2013
Disciplines
Abstract

Field foresters have long required a method of accurate measurement of perimeter and area during forest management activities. Perimeter and area assessments that can be derived from individual waypoints collected via global positioning system (GPS) units can be an expensive endeavor. A question of concern for practicing foresters is as the cost of GPS units increase does the accuracy of waypoints and any derived perimeter and area assessments also increase? This research evaluated whether the dynamic collection of waypoints using consumer-grade GPS units ranging from $50 to $700 provide a sufficient level of accuracy for the calculation of perimeter and area under three types of canopy cover: a newly established 3-year-old pine plantation, a 13-year-old pine plantation nearing first thinning, and a 40-year-old mixed pine/hardwood stand. Perimeter and area accuracy was not related to cost indicating that inexpensive GPS units provide an accurate waypoint location when used to derive perimeter and area measurements. When compared to a professional survey of each cover type, the average perimeter root mean square error (RMSE) ranged from 18.72 ft (0.41% of total perimeter) in the 40-year-old mixed pine/hardwood stand to 108.50 ft (2.43% of total perimeter) in the 13-year-old pine plantation. The average area RMSE observed ranged from 0.07 acres (0.22% of total acreage) in the 3-year-old plantation to 1.32 acres (4.67% of total acreage) in the 13-year-old pine plantation. For many forestry applications needing a perimeter and acreage assessment, these levels of accuracy should be more than sufficient.

Comments

Unger, D., Hung, I., Zhang, Y., Parker, J., Kulhavy, D., and Coble, D. 2013. Accuracy Assessment of Perimeter and Area Calculations Using Consumer-Grade GPS Units in Southern Forests. Southern Journal of Applied Forestry 37(4):208-215.

Posted with permission from the Society of American Foresters

Citation Information
Daniel Unger, I-Kuai Hung, Yanli Zhang, Jeffrey Parker, et al.. "Accuracy Assessment of Perimeter and Area Calculations Using Consumer-Grade GPS Units in Southern Forests" (2013)
Available at: http://works.bepress.com/david_l_kulhavy/34/