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Some key technologies on airphoto in mountainous valley

ZHENG Xue-dong, LIU Bo, CHENG Xue-jun, CHEN Peng-xiao (Yangtze River Scientific Research Institute, Wuhan430010,China)  
Some airphoto problems needed to pay attention about the flight-line design,airphoto taking,photo processing and the time suitable to take photos in mountain basin are introduced with Three Gorges Reservoir as an example.The methods for solving these problems are put forword as follows:①the method of airphoto scale rangs from 1/4 to 1/6 of map scale; ② a flight line uses belt method; ③the optional time intervals of airphoto taking are from May to June and from August to October in one year; ④when the contrast at the site is small, or the visibility is rather low and needs to enchance the contrast,the hardening agent should be prepared to process the film.
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