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Implementation of Modeling 3D Electric Sand Table

ZHU Chuhong1, OU Weilin2, WEN Xiaoyue1,3 (1. Land and Resources Surveying and Mapping Institute of Changsha, Changsha 410000, China; 2. The First Surveying and Mapping Intitute of Hunan Province, Hengyang 421001, China; 3. Department of Geomatics, Central South University, Changsha 410083, China )  
Modeling in levels is a new way to instruct electric sand table, including terrain modeling, buildings extraction, complex object modeling, terrain and object fusion, and so on. And it analyzes the excellence of this method. This method has been used in the modeling electric and table of CSU. It brings forward the matter needed reaching and settling next step, then improves efficiency of modeling 3D electric sand table.
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