Modeling of Global Radiation over Rugged Areas Based on DEM

Through extracting a series of related topographic parameters,such as slope gradient,aspect,and terrain shading areas,the digital model of direct radiation and diffuse radiation and global radiation is conducted by the means of a GIS based on overlay processing.The experiment shows that the regional distribution of solar radiation could be effectively visualized and quantified.It could be of critical significance for the research of regional microclimate,agricultural programming and the application of solar energy.