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1. Estimation of surface solar radiation considering the distortion of cloud shadow on complex terrain | |||
Li Bin,Hu Jichao | |||
Earth Science 08 April 2016 | |||
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Abstract:Clouds and terrain are the two most important factors that affect the surface radiation, and cloud shadows are also an important influencing factor to estimate the surface radiation with remote sensing method. Cloud and its shadow under different observation angle and the angle of the sun will lead to 3-D geometry effect. Furthermore, the terrain also has influence on downward solar radiation. At the same time, the cloud shadow distortion under complex terrain also should be taken into consideration in the estimation of radiation. So "coupling" the clouds and the terrain under the certain condition has the vital significance on estimating the surface radiation values. Cloud detection results of high resolution satellite data was used, according to the height of the cloud and satellite observation angle information the position of cloud on the image was corrected to get the true position of the cloud. To more accurately describe the shadow distortion caused by the terrain, a geometrical method was used to calculate the true position of cloud shadows on complex terrain. On the basis of the result after the calculation of shadows, downward surface solar radiation of the corresponding position was calculated based on some parametric methods for clear and cloudy sky respectively. Then, according to the mountain radiative transfer theory, DEM and albedo was employed in the topographic correction model for the downward surface solar radiation (DSSR) calculated above. Finally, we made some comparisons between cloud shadows on smooth surface and complex terrain as well as DSSR without any correction and with correction of terrain effect. The results showed that it is necessary to make these corrections on complex terrain. There were some big differences of the DSSR distribution and values before making correction. | |||
TO cite this article:Li Bin,Hu Jichao. Estimation of surface solar radiation considering the distortion of cloud shadow on complex terrain[OL].[ 8 April 2016] http://en.paper.edu.cn/en_releasepaper/content/4683529 |
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