基于光束法空中三角测量理论测量林分平均高度的方法

Measurement Method of Stand Average Height Based on Theory of Bundle Aerotriangulation

提出了利用航片计算林分平均高的方法。该方法是根据光束法空中三角测量理论,首先生成DEM和DSM模型,再从DEM和DSM模型中生成DVHM模型,最后从DVHM模型中生成林分平均高,并用固定样地林分平均高对DVHM模型生成的林分平均高进行了检验,结果表明:实测固定样地平均高与DVHM计算固定样地林分平均高差值最大为6.8m,最小为-0.3m,实测值与计算值之间存在着一定的线性关系。

A measurement method of stand average height is put forward based on the theory of bundle aerotriangulation. Firstly, models of DEM and DSM are generated. Secondly, model of DVHM is created from DEM and DSM. Lastly, stand average height are obtained from DVHM. And then the stand average height created from DVHM is verified by the stand average height of fixed sample plots. Results show that the maximum difference between measured value and calculation value of average height of fixed sample plots is 6.8 meters, and the minimum is - 0. 3 meters. There is a linear relationship between measured value and calculation value.