数字高程模型DEM及其显示

针对应用建模方法中建模数据的获取问题，在介绍数字高程模型(DEM)的数据采集方法和等高线模型、规则格网模型和不规则三角网模型三种表示模型的基础上，论述了基于等高线的建模方法。指出不规则三角网(TIN)与规则格网(RSG)的优缺点，并通过对相同等高线数据进行处理生成TIN和RSG图。结果证明，在两者不考虑数据结构的情况下，不论在误差方面还是在数据质量方面，TIN明显占有优势。

Digital elevation model (DEM) and methods of display

This paper is directed at some issue of model data obtainment in the model generation.And introduce the theory of Digital Elevation Model(DEM).The methods of data obtainment are enumerated.Next,three model generation methods(the Contour Lines,Regular Square Grid,Triangulated Irregular Networks)are discussed.Furthermore a method based on the contour lines is discussed in detail.The advantages and disadvantages of TIN and RSG are compared.At last,two pictures are stated.Regardless of the data structure,TIN is better than RSG in terms of errors or data quality.