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目前,世界上已有许多国家比较广泛地采用航空摄影材料,通过立体镜在航片上判读各地自然环境条件,从而鉴定土壤类型,勾划土壤轮廓界线,编绘土壤图件。航片用于土壤资源探测比较早的美国,1918年即开始使用,1938年正式采用。1972年7月和1975年1月又相继发射了两颗地球资源卫星,获得了大量的卫片,促进了土壤学和土壤制图学的发展;苏联1964年在土壤调查中开始应用航摄材料。目前
At present, many countries in the world have adopted aerial photographic materials more widely. Through stereoscopic mirror, they can interpret the natural environmental conditions in aerial photographs to identify the types of soil, demarcate the boundaries of soil and map soil pictures. Aerial photos for the detection of soil resources earlier in the United States, 1918 that began to use, formally adopted in 1938. In July 1972 and January 1975, two earth resource satellites were successively launched and a large number of satellite photos were obtained, promoting the development of soil science and soil mapping. The Soviet Union started to use aerial photographic materials in soil survey in 1964. Currently