Study Of Digital Terrain Models And Its Application Of Aligement Design

Digital Terrain Model has also made great development with the aligement ofCAD technology and the development of computer technology.Digital Terrain Modelone of the important foundations of modern Highway survey and Design, If theDigital Terrain Model technology can not be used in practical engineering greatly,Highways CAD technology also can't get a new breakthrough。Therefore, it isnecessary for digital terrain model in the application of Highway Engineering toconduct an extensive research to promote the development of Digital Terrain Modeland road systems integration.At first,the paper has carried on systematic research to the Digital TerrainModel.The paper describes the following in detail.They are the original geographydate collecting,the compositor of points'date,the construction of the "points-triangle-net"index mechanism, the Algorithm which be used to creat Delaunaytriangle, and ect.At last, it Achieved a Delaunay Triangulation Network Configuration.Secondly, the thesis has carried on the research to the performance of the threedimensions and truefeelings of graphics.It carries on the concise analysis to thegraphic academic theories, and then to the realization used OpenGL. It also has done ainstruction on the the key technologies of terrain visualization.Thirdly, the paper has carried on analysis of Digital Terrain Model in theapplication of highway engineering.The Digital Terrain Model can accurately andquickly provide the necessary route for all graphical information.Digital TerrainModel biggest characteristic is that the measurement without the need for furthercircumstances, can be generated automatically as a line program longitudinal andtransverse ground elevation line, which provide for the optimal aligement design.Finally, the paper has carried on the interpolation analysis of the Digital TerrainModel. longitudinal and cross-sectional ground line interpolation accuracy of a directimpact on the quality of road design. Therefore,this paper has done a research on theaccuracy of the DTM factors by the aspects of the source of the data, and proposed the methods to improve the accuracy.And use othe mathematical models(Li, 1993) toquantify DTM forecast accuracy, precision and obtained a quantitative relationshipbetween sampling and density.The paper has verified the theory and method in the correctness and feasibilityand practicability with the actual project.The fact proves that the theories andmethods are viable. Practice shows that it to further clarify the Digital Terrain Modelsupport modern road design, road 3D design, a platform.