Data used:
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30 meters DEM (Digital Elevation Model) data
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30 meters color data - satellite image
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The whole surface is divided into parts covering areas 20 x 20 points.
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Each part is modeled in VRML separately. Only lighting is common in the main file.
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The main file is an "index" that indicates the parts of world that should be loaded.
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While moving the viewpoint above the surface the areas that are no longer necessary disappear and new areas are loaded.
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The rendering resolution of the an area depends on the distance from the user viewpoint.
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