A New Method for Extracting Elevation Information of River System from Contours

Abstract. Considering the existing problems in methods of extracting elevation in river system, such as low efficiency, low accuracy, elevation logic errors and other issues, this paper proposes a new method of elevation extraction based on contours. Firstly, the spatial relationship between river system and contours is constructed to improve the intersection efficiency. Secondly, the accuracy of river system elevation can be improved and river flow logical error can be avoided by using the method of interpolation of trend surface of the river section. And then, the river tree is established to avoid the logical error of river system. Many comparison experiments about efficiency, elevation accuracy and elevation logical error between this method and other two conventional methods have been carried out, and the results show that both accuracy and efficiency can be improved and there is no logical error of elevation by this method.