A GTP-based Entity Model for Underground Real 3D Integral Representation
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摘要: 从建模对象、组成元素和拓扑描述三个方面对广义三棱柱(GTP)模型进行了修正和扩展。基于修正与扩展后的GTP模型,从地学、几何、拓扑三个层面对地下实体进行了提炼,抽象出8种空间构模几何元素,并将地下实体划分为点、线、面和体4类,体实体又进一步划分为简单体、复合体和复杂体,进而提出了一种基于GTP的地下真3D集成表达的实体模型(GTP-based entity model,GTP-EM);采用面向对象的方法,通过构模元素之间拓扑关系的定义实现了地下实体的拓扑描述,并应用实例验证了GTP-EM的可行性。Abstract: Based on the amended and extended GTP model,the underground entity is extracted in levels of geosciences,geometry and topology,and eight geometric primitives including node,edge,arc,triangle,supper-surface,GTP,tetrahedron and super-body are abstracted.The arc refers to an unclosed curve comprised of two or more end-to-end edges,the supper-surface refers to a spatial surface represented by a group of triangles in order,and the supper-body is a spatial region enclosed by a few supper-surfaces or formed by a group of adjacent GTP elements.The geo-entity is 0-3D classified into point entity,line entity,face entity and body entity,and the body entity could be furthermore sorted as simple body entity,compound body entity and complex body entity.A GTP-based entity model(GTP-EM) is presented for underground real 3D integral representation and modeling.With object-oriented method,the topological relations are defined by geometrical elements.With the 3D integral geo-entity representation and modeling for the subway and its surrounding strata located underground,the central business district(CBD) in Beijing city is taken as an example.
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Keywords:
- digital mine /
- entity model /
- GTP-EM /
- real 3D integral representation
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