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航空像片早在五十年代中期就在森林经理调查中广泛采用了,但是,在我省造林调查设设上应用的则很少。一是过去大部份造林调查地区无航测资料;二是有的地方有一部份航测资料,由于比例尺过小1/2.5～1/3万,拍摄年代久远,满足不了造林调查设计的要求。所以多年来主要是直接测量成图或利用放大的地形图进行造林调查设计。不仅需要大量人力,物力而且劳动强度大,作业时间长,工作效率低,质量也难以保证。
Aerial photographs were widely used in forest managers’ surveys as early as the mid-1950s. However, there are only a few applications in afforestation investigations in our province. First, there was no aerial survey data in most of the afforestation survey areas; second, there were some aerial survey data in some places. As the scale was too small, it was 1 / 2.5-1 / 30,000 and the shooting time was long, which could not meet the requirements of survey and design of afforestation. Therefore, over the years, mainly direct measurement into maps or use of enlarged topographic maps for afforestation survey design. Not only requires a lot of manpower, material resources and labor-intensive, long working hours, low efficiency, quality is difficult to guarantee.