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Building block of the terrain model.
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Geographic coordinates of the northwest corner of the terrain chunk
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Size of the terrain chunk in minutes (currently we use 15- and 30-minute files for most New York State)
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Mesh simplification threshold. The higher value, the smaller number of triangles is created to produce an approximation of the terrain shape, but the faster rendering. (0.3 for a very precise terrain shape approximation to 1.5 for rough approximations)
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Preferred texture size in pixels. This can be used to force a wavelet decompressor to produce uncompressed textures smaller than their originals (useful for some OpenGL hardware)
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