THREE-DIMENSIONAL MAP DATA GENERATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To analyze a shape of a building to properly use a texture for each side surface when automatically generating three-dimensional map data.SOLUTION: A building frame is translated in a height direction to automatically generate a three-dimensional polygon. A texture is automatically selected and pasted for each of side surfaces of the three-dimensional polygon among from a plurality of kinds of preliminarily prepared textures by the steps of: thinning the building frame to obtain its center line; selecting one of selection patterns preliminarily stored in a texture DB on the basis of the shape of the center line and a building type; setting prepared textures to surfaces parallel with and crossing the center line respectively; and repeatedly pasting textures for windows or the like in arrangement corresponding to a side surface shape of the building. Using the center line in this manner allows shapes of various buildings to be simplified and analyzed, so that a texture for each side surface can be properly used with light processing load in more reality.