2HALLO J C,MANNING R E,VALLIERE W, et al. A case study comparison of visitor self-reported and GPS recorded ravel routes [ C]//BRICKER K,MILLINGTON S J. Proceedings of the 2004 Northeastern Recreation Research Symposium. New York: USDA Forest Service, Northeastern Research Station, 2005 : 172-177.
3TACHIKI Y,YOSHIMURA T,HASEGAWA H,et al. Evaluation of GPS positioning accuracy while walking in forested areas[J]. Journal of Japanese Forestry Society,2004,86 ( 1 ) :5-11.
