A Feature Analysis Approach in Simplification of 3D Building with Complex Flat Roof

GE Lei1,2,3,†, WU Fang1, LI Jiansheng1,3, MA Zhigang1,3

ACTA Scientiarum Naturalium Universitatis Pekinensis - - Contents -

1. Information Engineering University, Zhengzhou 450001; 2. State Key Laboratory of Geo- information Engineering, Xi’an 710054; 3. Henan Collaborative Innovation Center on Application Technology of BDS, Zhengzhou 450001; † E- mail: chxy_ gray@163.com

Abstract A new generalization approach based on feature analysis method is proposed to deal with buildings with complex flat roof. This approach divides features of building roof into three types, which are two-edge feature, three edge feature and component feature. Simplification algorithms are developed to deal with different feature types. By analyzing the relationship of the three algorithms, a detailed process to simplify complex flat roof is developed. The approach is implemented and tested on a number of 3D buildings. Two typical buildings and a building cluster are simplified by the proposed algorithm under different threshold. The experiment results show that the 3D building can be efficiently generalized, while the characteristics of roof structure can be well preserved after simplification. Key words 3D building; generalization; simplification; feature analysis; LOD

建筑物是三维城市中最为重要的地物类型, 造型丰富、数量庞大, 且最能够反映城市特点, 是人们认知城市最重要的依据。从应用角度看, 如何快速获取三维建筑多尺度模型以满足不同的应用需求, 已经成为一个迫切需要解决的问题。CITYGML

[ 1], 根据建筑设计了 5 个细节层次的三维建筑模型的具体特点, 通过综合的方法, 由高细节层次的模型生成低细节层次模型成为获得多尺度三维建筑模型的重要手段。

当前对于三维建筑综合的研究主要以消除建筑细节特征为目标。Mayer[ 2]和 Forberg[ 3]基于数学形态学的方法, 对三维建筑特征进行化简, 但是该方

[ 4]法仅能处理平行结构特征。Thiemann 等 提出一种基于面分割的三维建筑化简方法, 该方法能够扩展到建筑语义模型综合, 具有较强的实用性, 但其分割过程需要大量几何运算, 效率不高; Kada[ 5– 6]提出一种基于单元分解的方法, 提取和化简建筑特征,该方法处理规则结构建筑的效果理想, 但无法很好

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