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据加拿大《林业纪事》杂志(1975)报道:最近该国又进行一次用大比例尺航空像片清查森林资源的试验。试验的目的是试图发展一种以大比例尺像片测树为基础并取消大量地面工作的清查方法。试验工作是1973年由加拿大森林经营研究所和加拿大国际造纸公司共同进行的。
According to the Canadian Forestry Chronicle (1975), a recent experiment with inventories of forest resources using large-scale aerial photographs was also conducted in Canada. The purpose of the experiment was to try to develop a method of inventory based on large-scale photogrammetry and the elimination of extensive ground work. The test was carried out in 1973 by the Canadian Institute of Forest Management and Canadian International Paper Company.