Construction Geometric Model and Topology for 3d Cadastre : case Study in Taizhou, Jiangsu
Yuan Ding, Changbin Wu et al.
As the economic development of China, the demands of land resources are growing rapidly. For this reason, the land development is extending to 3D space. In order to manage the 3D space of land use, 3D cadastral management is needed urgently in China. Modeling of the 3D cadastral objects is always the core in the research of 3D cadastre. For the sake of considering the historical cadastral registration and the full utilizing of existing 2D cadastral data, a widespread solution to construct 3D cadastre is using the existing 2D cadastral data. For most of the 3D cadastral objects are regular, simple and practical approaches based on extrusion are widely used in 3D modeling. In this paper, we aim to propose a new modeling approach for the 3D cadastral object based on extrusion. Unlike most of extrusion approaches, our approach does not allow overlapping among footprints which are used to construct one or more 3D objects. Based on this approach, we extracted 2D topological features from 2D footprints. Then we used 2D topological features and height values to present 3D topological features. By studying the 3D cadastral situation of Pozi street in Taizhou, we have knew the requirements for 3D modeling. We applied our approach to model 3D property space and construct its topology in Pozi street. It can construct more 3D objects than extrusion based approaches before. It provides an easy and practical solution for constructing 3D model and topology in 3D cadastre. Using 2D feature to present 3D feature can save storage space. Considering the current situation of cadastral management in China, it may provide a new idea for constructing 3D cadastral objects.
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