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Research of Building the Digital Elevation Model( DEM ) & 3D Visualization of DEM

Author: HeHuiMing
Tutor: HuWuSheng
School: Southeast University
Course: Geotechnical Engineering
Keywords: Digital ground model (DEM) Discrete points Triangulated irregular network TIN Grid GRID Algorithm Interpolation Right A perspective view 3D visualization .
CLC: P208
Type: Master's thesis
Year: 2004
Downloads: 1559
Quote: 16
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Abstract


Massachusetts Institute of Technology Professor Miller freeway auto design in 1956 , the concept of a digital terrain model , DEM is used to line (rail, road , power lines) design and various engineering area , volume , the calculation of the slope between any two points of visibility to determine and draw any sectional view ; mapping is used to draw the contours, slope and aspect maps, three-dimensional perspective view of production orthophoto maps and map resurvey ; can be used as auxiliary data classification in remote sensing ; geographic information system based data can be used in the current land use analysis , rational planning and flood danger forecast ; military can be used for navigation and missile guidance ; industrial use DSM (Digital Surface Model) , a digital surface model or a digital object model drawing showing the surface structure of the complex shape of the object [2] . In short , the use of DEM is very extensive. The DEM theory and technical areas related to the techniques and methods of data collection , data structure design and processing , the model interpolation algorithm and algorithm , DEM 3D visualization technology , DEM precision evaluation of its quality control , and with them are highly relevant to the development of computer technology . It has long been said DEM terrain precision , data collection , DEM gross error detection , quality control , DEM data compression , visualization of the DEM DEM application triangulated irregular network TIN establishment and interpolation the technical aspects of continuous research . The main contents of this paper include : the built based on the discrete points triangulated irregular network TIN algorithm ; the ② triangulated irregular network TIN based on interpolation algorithm ; ③ based on Visual Basic 6.0 programming platform TIN interpolation algorithm to develop and build a digital terrain model of the system ; ( 4 ) real data accuracy test to evaluate the above algorithm ; the DEM grid ⑤ using digital terrain model generated by the system to achieve its three - dimensional perspective view of a digital photogrammetry system VirtuoZo ; ⑥ the combination of a large number of references , summarized DEM accuracy assessment of its quality control methods .

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CLC: > Astronomy,Earth Sciences > Surveying and Mapping > General issues > Mapping database and information system
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