Adaptive Mesh in Visualization of Terrain Elevation Data
ARMY TOPOGRAPHIC ENGINEERING CENTER FORT BELVOIR VA
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The initial step in terrain visualization is to utilize terrain elevation data to portray the earths surface. After that, features are overlaid as terrain colors, textures, or models on the visualized elevation data. Terrain elevation data are often visualized in a wire-frame mesh where grid posts represent the elevations of corresponding points in the terrain. When terrain is displayed in a perspective view, the grid sizes in the wire-frame mesh must be varied adaptively according to the distance between the viewpoint and the terrain so that the area nearest to the viewer is more densely sampled than the area further from the viewer. A wire-frame mesh with such varying grid sizes is called an adaptive mesh in this paper. A loosely defined adaptive mesh often creates anomalies between two areas with different grid sizes. This paper presents a few schemes for adaptive meshes that do not create anomalies. TERRAIN VISUALIZATION, WIRE-FRAME MESH, ADAPTIVE MESH.
- Cartography and Aerial Photography