论文部分内容阅读
一九七三年上半年,我队在临沦地区进行了260多万公顷的森林资源清查。在这次清查中,森林资源面积是用地面成数抽样的方法调查的。为了验证地面成数抽样的精度,并探讨在大面积森林资源清查中使用双重成数抽样的可能性,我们在该地区的茂兰林场,做了实测验证和以1∶25,000航空像片(1958年摄影)现地调绘为准的比较验证工作。现将试验方法
In the first half of 1973, our team carried out more than 2.6 million hectares of forest inventory in Linlin area. In this inventory, the area of forest resources was surveyed using the sampling method of land accumulation. In order to verify the accuracy of the land sampling and to explore the possibility of using dual-sample sampling in large-scale forest inventory, we conducted field tests at the Maolan Forest Farm in the area and used 1: 25,000 aerial photographs (1958 Year photography) is to compare the current Tiaohua verification work. Now the test method