一种基于GTP的地下真3D集成表达的实体模型  

A GTP-based Entity Model for Underground Real 3D Integral Representation

作　　者：吴立新[1] 陈学习[2] 车德福[2] 徐磊[2] 

机构地区：[1]中国矿业大学3S与沉陷工程研究所 [2]东北大学3S与数字矿山研究中心,沈阳市和平区南湖110004

出　　处：《武汉大学学报（信息科学版）》2007年第4期331-335,共5页Geomatics and Information Science of Wuhan University

基　　金：国家杰出青年基金资助项目(50525414);国家自然科学基金资助项目(40571137);北京市自然科学基金重点资助项目(4041005);国家教育部高校青年教师奖专项基金资助项目

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。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 sup- per-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.

关 键 词：数字矿山 实体模型 GTP—EM 真三维集成 

分 类 号：P208[天文地球—地图制图学与地理信息工程]