期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2008
卷号：XXXVII Part B2
页码：329-334
出版社：Copernicus Publications
摘要：The development of digital terrain analysis based on DEM is helpful for the simulation of astronomic radiation in rugged area. However the effect of DEM scale causes great uncertainty to the simulation. Taking loess hilly region and mountain of Qinling as test area, this paper conducts the relationship between simulated astronomic radiation and DEM resolution through simulating daily, monthly and yearly astronomic radiation based on a serial of DEMs with different resolutions. The experiment result shows that simulated astronomic radiation increases gradually with decrease of DEM resolution. When DEM grid cell size is greater than relative heights of test area, radiation simulation is stable and the terrain factors such as slope gradient and aspect do not impact the redistribution of solar radiation any more. In loess hilly region, when DEM grid cell size is near 1 000- meter, the relative error on yearly astronomic radiation is about 22% that is above to a winter's radiation in this area. In Qinling mountain area, errors are relative small and the maximum of relative error is 17.8%. In a word, the impact of DEM resolution of simulating solar radiation is greater in hill than that of mountains
