从1948年起,苏联开始采用森林航空调查法,广泛地采用航摄照片。所以能采用航空调查法,是因为当时苏联已经具有全国各地的小比例尺航空照片,并已编制有1:100,000的全国航摄图。至1956年止,已用航空调查的方法调查了8亿多公顷的森林,摸清了苏联广大地区内的森林资源,并绘制了1:2,500,000的森林图。从而为进一步进行更精确的森林经理工作和 From 1948 onwards, the Soviet Union began to use forest aviation investigation method, extensive use of aerial photography photos. Therefore, the method of aerial investigation can be adopted because at that time the Soviet Union already had a small-scale aerial photograph of the whole country and a 1: 100,000 national aerial photograph had been prepared. By 1956, more than 800 million hectares of forest had been surveyed by aerial surveys, the forest resources in vast areas of the Soviet Union were found, and a forest map of 1: 2,500,000 was drawn. Thus furthering the work of forest managers and more accurately