全站仪固定样地测树原理及精度分析

本文提出应用全站仪在森林固定样地中测树 ,全站仪与PC—E5 0 0袖珍计算机或PDA连接 ,可自动测量每一棵树的树高、胸径或任一直径、树心三维坐标、冠幅等。其测量树高的精度可达 1 / 1 4 0 0 ,测量直径的精度可达 1 / 2 0 0 ,树心平面坐标定位精度可达 1 5mm ,冠幅测量可达 1 / 1 30 0 0精度 ,均高于测树的需要精度。特别重复实验了任意高处直径的测量 ,与轮尺测量的结果最大差 2 1mm ,最小差 1 6mm。

The analysis of Forestry mensuration principle and precision in fixed samples by total station

This paper puts forward that total station was applied in mensuration in fixed samples; it can automatically survey each tree's height, diameter at breast or any other diameter, 3-mentioal coordination of core and coronal etc. The precision of height can attain 1/1400, that of diameter attain 1/200, that of plane coordination of core attain 15mm and that of coronal surveying attain 1/13000. They all can meet the precision needed in mensuration. Particular emphasis is placed on the experiment of survey diameter at random height repeatlly ,the max difference of the result with that by clipper is 2.1mm, the min is 1.6mm.