Basic HTML version of Foils prepared November 29 98

Foil 34 GIS_Terrain

From 3D Geographical Information Systems in Tango CEWES Tango Training -- November 17-18 98. by Remek Trzaska, Pawel Roman, Chris Walczak, Marek Podgorny


1 Building block of the terrain model.
  • Geographic coordinates of the northwest corner of the terrain chunk
  • Size of the terrain chunk in minutes (currently we use 15- and 30-minute files for most New York State)
  • 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)
  • 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)
2 DEF GIS_Terrain Info {
3 string "76:15:00,43:15:00 15 0.5 512"
4 }

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