林业调查设计中测量的任务是很大的,通常是以一个施业区为单位进行,以分区作为编制林业基本图的单位,要求沿施业区及分区境界线跑经纬仪导钱,组成导线网作为全调查区的控制。这样,每个导线环的测站数就需要测设很多,有时竟达二百点以上,精度很难保证,且林区多在丛山峻岭中,每条边用钢尺直接丈量就很 The tasks of surveying and mapping in forestry survey are very large. Usually, it is carried out in the unit of a construction area. The zoning is used as the unit for compiling the basic map of forestry. It is required to run the theodolite along the boundary of the construction area and zoning to guide the money and form the wire net As the whole investigation area control. In this way, the number of stations for each wire loop need to test a lot, and sometimes as high as 200 or more, the accuracy is difficult to guarantee, and more in the mountains and forests in the mountains, each with a steel rule to measure directly