Texture classification and resolution control for 3S urban map

This paper proposes a method to control texture resolution for rendering large-scale 3D urban maps. Recently, performance of computers has been developed rapidly, but it is still hard to directly handle the large-scale 3D maps on PCs, because of its high requirement for hardware capability. Thus the data reduction is essential for rendering of the large map. Since on the 3D maps, texture data, in general, tend to be far larger than geometry data, it is more effective to reduce the texture data by exploiting the LOD (level of detail) in order to decrease whole data size. To achieve this, we propose a method to control the resolution of the texture. In our method, the textures are classified into some classes. The appropriate texture resolutions are decided according to their rendered sizes on a display and their importance, and the classes they belong to. We verify the validity of our resolution control method by some experiments.