Application and precision analysis of several surveying methods in forest resources survey.

This paper compares and analyzes several surveying methods in forestry resource investigation via an analysis of experiment datum and theory reasoning.The research findings are as follows:(1) The compass could only satisfy the criteria and standards of surveying sample plot due to its roughness;and its accuracy would decrease significantly while distance and vertical angle increased;the compass was inconvenient,imprecise and inefficient for large scale forestry acreage survey or special scientific research.(2) When the length measured by total station was not over 100 m,semi-observation accuracy of distance measuring could reach 1/10 000 and height measuring error wouldn’t be over 1 cm;and the measuring was hardly affected by distance and vertical angle.(3) When acreage and length were over 3.34 hm2 and 100 m respectively,handy global positioning system(GPS) could replac e compass,and its measuring accuracy could be improved by coordinating difference or modifying parameter of coordinates transform.Besides,development of network real time kinematic(RTK) with total station would be main instruments for the precise forestry surveying.