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An Interpolation Method of DEM Based on Hydrological Improved Algorithm
基于水系改进的数字高程模型内插研究

Keywords: digital elevation models,hydrology,interpolation,precision
数字高程模型
,水文,内插,精度

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Abstract:

The watershed topography is a key factor for extraction of the drainage,and it is also a very important topic in the study of digital watershed and the distributed hydrological models.The paper firstly discusses some problems in hydrological analysis by applying the DEM,and describes three kinds of interpolation models to produce the DEM.Then the author introduces an interpolation method which could improve the accuracy of the DEM by judging the stream's flow direction.Finally the interpolation algorithm is applied to generate the DEM by using the elevation and stream data in the area of southwest China.We analyze the results of the experiment,and find that the DEM created by this method not only keeps its precision but also presents a fine surface runoff character and stream pattern.Moreover,by comparing with the stream lines that extracted from different DEMs,the paper concludes that the DEM created by the hydrological improved algorithm is more useful in dealing with the hydrological analysis.

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