3-d Building Model Automatically Generated from Building Contour Partitioned

Based on features on digital map, such as building contour and road polyline, we are proposing the system to generate 3-D Urban Model automatically, integrating GIS and CG. 3-D Urban Model is the important information infrastructure that can be utilized in several fields, such as landscape evaluation, urban planning, civil engineering, architecture, disaster prevention simulation, etc. When a real urban world is projected into 3-D virtual space, buildings are major objects in this space. To realize 3-D CG urban model, it is important to generate building models efficiently. In this paper, we propose the GIS and CG integrated system to generate 3-D building models automatically from building polygons on the digital map stored by GIS. Some building polygons have a lot of vertices and are complicated in shape. We present the algorithm for breaking down complicated polygon into primitive ones. Building models are automatically generated from the building polygon partitioned by this algorithm. In the last chapter, we show proposed 3-D urban models automatically generated for urban planning.