Study on drought fine distribution over rugged terrains based on GIS

摘要

Using GIS technique and 1 : 250000 DEM data, this paper studies the distribution of drought frequency determined by two interpolation methods of inverse distance weighted and regression. The results from two methods are compared. The results show that the regression method based on the factors of climate and geography can reflect drought distribution reasonably and can be used for space extension over the rugged terrains where meteorological stations are sparse.