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《Chinese Journal of Atmospheric Sciences》 2004-04
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Measuring Meteorological Visibility Based on Digital Photography——Dual Differential Luminance Method and Experimental Study

Lu Weitao 1) , Tao Shanchang 1) , Liu Yifeng 1) , Tan Yongbo 1) , and Wang Benge 2) 1) (School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026) 2) (China Civil Aviation Hefei Air Traffic Control Center, Hefei 230051)  
Researches on ground based and space based quantitative meteorological remote sensing using the digital photography have attracted extensive attention By setting two targets at different distances from observation station near horizon, daytime meteorological visibility can be deduced from the ratio of the two measured luminance differences between target and its horizon sky background (Dual Differential Luminance, DDL) The DDL method and its standard observation conditions are reported in detail The DDL can eliminate the effects of dark current of CCD camera and stray light of background, improve the precision and enlarge the measuring range of Digital Photography Visiometer System (DPVS) Some experiments have been performed to compare DPVS with Visl FD12 visibility meter, one Visl MITRAS Runway Visual Range Assessment System and visual observation at Luogang Airport, Hefei, in 2002 Plentiful results showed that DPVS works consistently with other instruments and visual observation in a reasonable precision, and is feasible and reliable even if the visibility is up to 200 times the baseline length
【Fund】: 国家自然科学基金资助项目 49975 0 0 5
【CateGory Index】: P412
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