| 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. |