Constructing DEM from Simple Terrain Information Using HASM Method

This paper uses HASM method to construct DEM from stream lines and scattered points.A case study on the typical landform of plateau of China,Kongtong gully of Dongzhi Plateau,Qingyang,Gansu Province,is presented.The original data is manually vecterized from scanned maps 1∶10 000,includes scattered points,stream lines,contour lines,precipitous cliff lines of a region of area about 4×5 square km.For simplicity this paper uses only the former two of them.Compared with the result from stream-line-constrained TIN and hydrologically correct DEM construction method thin plate spline(TPS),through visual inspection,HASM gets a more desirable DEM and more reasonable integration of information of the terrain features.Some challenges and future research about HASM is also given.