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Research of Digital Elevation Model Generation and Visualization Based on TIN

Author: HeJiFeng
Tutor: ChenXueGong
School: Central South University
Course: Computer technology
Keywords: Digital Elevation Model Delaunay triangulation OpenGL Visualization Convex hull
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 57
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Abstract


Digital elevation model (DEM) is to build a virtual terrain environment an important step . TIN-based DEM around data modeling , this paper studies the convex hull of discrete points generation algorithm , discrete point Delaunay triangulation algorithm, with the constraint Delaunay Triangulation algorithm, 3D terrain visualization . In the discrete point generating convex hull , this paper proposes a discrete point on the axis generated convex hull algorithm first discrete points sorted by x-axis , and then take the first point after sorting and last points constitute a discrete point of the central axis, if the point is located in the upper part of the axis , are involved in the construction of the upper convex hull , and mark that point has been processed , was no longer involved in the marking points lower convex hull calculation , the algorithm is simple ideas , easy to program , good robustness , high operating efficiency . At discrete points Delaunay Triangulation , the paper using the \In the constrained Delaunay triangulation , the paper side of the first control point constrained discrete points along together constitute the Delaunay triangulation , and then provide constrained edge embedded in the Delaunay triangulation . In 3D terrain visualization , the paper provided using OpenGL technology to generate three-dimensional visualization of three-dimensional visualization of DEM data .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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