Research On Digital Elevation Model Development And Application

As the technology of the computer and information have constantly developing and the application of the digitized concept in surveying is deepened constantly, the survey taking " 3S "," 4D " as main means of production has already become the new developing information industry, is getting attention from various fields of society day by day , Digital Elevation Model (DEM) become an important component of geographical space infrastructure and " digital earth " . Today, GIS is vigorous, the data source of DEM and its method of setting up will be one of the key research subjects in surveying and GIS domain.This text mainly introduce the way to obtain datum and the method to setup Digital Elevation Model, recommend the characteristic, classification and the expressing methods and characteristics of classification for Digital Elevation Model, compare the two mainly methods to set up DEM; Triangular network of Delaunay is the optimum triangular network in the TIN, this text also recommends three methods to setting up Triangular network of Delaunay and linear interpolation of TIN also is introduced in the article, and the precision's estimation of DEM is briefly disscused. ArcGIS 8 is a unified geographical platform of GIS, this text select ArcGIS software to set up DEM model, and recommends the process to set up the irregular triangular net work (TIN ) model using Arc Catalog in ArcGIS software, Arc Toolbox , Arc Map , Arc Scene and AutoCAD. Finally have proposed the conclusion and looked forward the future.