A 3d GIS's Spatial Data Model Based On Cell Complex

Based on cell complex theory, after analyzing the corresponding relationship among cell, cell complex and 3D spatial solid, a formal definition for 3D spatial solid is presented. Through analyzing the geometric constructing relationship between cell and cell complex, we induce element boundary define and adhesive relationship existed in 3D spatial object; analyse three kinds of non-manifold cases in three dimension, which are regarded as non-manifold adhesive relationship. And to express complicated 3D non-manifold solid and make sure the completeness and uniqueness of element topology information in model, relevant topological data structure is developed. Taking the surface and underground 3D space around University City region of Xianlin, Nanjing as the research object, a 3D model with complicated geological environment and man-made buildings is established based on the new presented 3D GIS data model, verifies the efficiency and application of the 3D GIS data model proposed in this paper. * Corresponding author. This is useful to know for communication with the appropriate person in cases with more than one author. 1. INTRIDUCTION Along with the advance of science and human’s requirement, human activities have extended to underground space. Especially urban underground space is used as important resource for exploiting, such as subway, tunnel, air defence engineering, pipeline, underground parking and so on. So many projects in company with original geology body compose of complicated underground 3D space and change the geological characters such as bearing capacity, underground water flow field etc. To describe, manage, analyse and display so complex underground spatial objects, we should make use of 3D GIS. Recently researchers at home and abroad have some systemic researches which include corresponding theory and technology method of 3D GIS. Summing up these researches, it is a general way for 3D GIS research that taking spatial data model for key and massive spatial data management and maintenance for base and spatial analysis as well as visualization for application support. Thereinto, spatial data model is to simplify real world and pursue disperse model to express geographical object which can be treated with by computer. So it is the core issue of 3D GIS.