ANUDEM和TIN两种建立DEM方法的对比研究

针对流域水文和土壤侵蚀定量模拟分析需要,对基于TIN和Hutchinson方法建立的DEM表现地形形态和起伏的能力进行了对比研究。结果表明,基于TIN建立的DEM始终存在一些平顶现象,一些较小的侵蚀沟被忽略,其上提取的河流不完全连续,多处出现多重线条河流,因而不能如实地反映地形起伏的细部特征。而基于ANUDEM建立的DEM,其派生等高线的形状与输入等高线吻合较好,较好地表现了地形的形态和起伏,对地形和坡度的反映更加连续和光滑,其上提取的河流信息基本与地形图上的河流一致。

Mainly considering the demand of regional soil erosion and hydrological modeling,the DEMs generated from TIN and Hutchinson s method(ANUDEM),and their representation of the hydro-geomorphology characteristics have been compared.The results show that,in the TIN DEM,there are inevitably flat hilltops,some eroded gullies have been ignored during TIN constructing,the stream networks based on the DEM is not continuous,and multiple lines rivers exist.In Hutchinson method based DEM,the DEM derived contours match t...