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要估测森林蓄积,必须首先知道平均树高。直接从像片上得到树高的方法不外估测和量测两种。但是,进行像片估测,必须具有相当经验,进行像片量测则起码要有视差杆,而且像片量测操作既费时又费事。为了使像片测高工作既简单易行,又能满足一定精度要求,去年我们在黑龙江省带岭东北林学院凉水试验林场初步试验了一种新的量测方法。这种方法无须使用视差杆或其量测仪器,只要有反光立体镜和专门制作的量测模片
To estimate forest stock, you must first know the average tree height. Directly from the tree to get the image method is no more than two kinds of estimation and measurement. However, the evaluation of the image must have considerable experience, and the image measurement requires at least the parallax rod. Moreover, the photo measurement is time consuming and laborious. In order to make the image altimetry easy and meet the requirements of certain accuracy, last year we tested a new measuring method in cold water experimental forest farm of Donglin Forestry College of Bailing, Heilongjiang Province. This method does not require the use of parallax rods or measuring instruments, as long as the reflective stereoscopes and specially made measuring die