目测法估测树高的误差分析

利用目测法和VertexⅣ测高仪对黑龙江省凉水林场的部分树木高度进行测量,通过实测数据和目测数据的比较分析,结果表明:目测数据普遍低于实测数据,而且随着树高和冠幅的增加,估测误差也呈增大趋势,估测误差的波动范围很大,平均估测误差为3.4 m,目测数据和实测数据的拟合效果一般,平均估测精度为82.6%。几个主要树种的估测误差平均值在3～4 m左右,误差大于5 m的数据主要集中在红松和水曲柳中。

Error Analysis of Tree Height Estimation Based on Eye Measurement

Eye measurement and Vertex IV Altimeter were adopted in tree height measurement of partial forest in Liangshui forest farm,Heilongjiang province.And the measured data was compared with its true value.Results show that the tree height data got from eye measurement are generally lower than the true value.With the increase of tree height and crown width,the estimate error shows an ascendant trend.And the estimated error fluctuation range is large,with average value of 3.4m.According to the correlation analysis,it indicates that eye measurement just fits for the true value,and the average estimate precision is 82.6%.The average error of some main species is nearly 3 to 4m,while the error that is greater than 5m mainly distributes in Korean pine and ash tree.