ANUDEM—专业化数字高程模型插值算法及其特点

基于已有地形图的数字化方式,通过内插方法建立数字高程模型,是迄今为止最为成熟和简单易行的DEM建立方法。ANUDEM是利用等高线、高程点和河流等数据插值建立DEM的专业化软件。该软件的基本算法由插值、数据平滑、地形强化等组成。软件具有自动诊断数据错误,客观地确定适应于插值基础数据精度的分辨率等特点,用其建立的DEM能正确反映地面水文地貌特征。初步应用研究表明,ANUDEM可应用于黄土高原并建立水文地貌关系正确的DEM,其质量较现有基于TIN方法建立的DEM有明显提高,能更好地描述地面的起伏和水文地貌关系。

ANUDEM-A professional DEM interpolation software package

Because it has become common to produce DEM using interpolation based on digitized topographic maps it is important to investigate DEM options.ANUDEM is an advanced software package that has been designed to produce digital elevation models(DEMs) from very large topographic data sets,including elevation contours,point elevations and streamlines.The basic algorithms include interpolation algorithm,roughness penalty algorithms,drainage enforcement and locally adaptive strategies.Errors in the input data can be diagnosed and an optimum grid resolution,matched to the density and accuracy of the input data,can be provided by the program.ANUDEM is very efficient and has been applied all over the world.We applied ANUDEM in loess hilly area to interpolate digital topographic maps,including contours,spot heights,and stream networks,the results show that hydrologically correct DEM can be generated,and the quality is much better DEM based on TIN approach,the complex eroded terrain can be sufficiently represented.