| 复杂地形三角网格局部渐进传输方法 |
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| 引用本文： | 马啸,陈飞翔,彭俊杰.复杂地形三角网格局部渐进传输方法[J].测绘学报,2015(Z1):135-142. |
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| 作者姓名： | 马啸 陈飞翔 彭俊杰 |
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| 作者单位： | 1. 北京林业大学信息学院,北京,100083;2. 中国航天科技集团公司物联网技术应用研究院,北京,100094 |
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| 基金项目： | 中央高校基本科研业务费专项(TD2014-02)，中国地质调查局地质调查工作项目(1212011120436)Foundation support:Fundamental Research Funds for the Central Universities(TD2014-02)，China Geological Survey Project(1212011120436) |
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| 摘 要： | 在数据高速共享的信息时代,数据传输是共享的前提和基础,而三维数据本身的复杂结构带来的海量数据对其传输、使用造成极大限制,因此,实现三维数据的高效传输十分重要。为解决三维空间数据高效传输的问题,本文提出了针对复杂地形三角网格的局部渐进传输方案。具体过程包括:首先在服务器端通过基于边折叠的三角网格化简和基于遗传算法的化简优化方法对网格模型进行预处理,并在服务器端构造折叠树存储网格简化信息;然后根据客户端的连接请求,向客户端传递化简后的初始网格,并根据用户的局部放大操作,在服务器端实时展开相应位置的网格结点并向客户端传输;最后,客户端将接收到的少量网格结点信息进行重组,实现局部放大效果,从而避免不必要的结点展开和传输。通过对遗传算法的效率和局部渐进传输时间的测试,验证了这一局部渐进传输方案的可行性。
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| 关 键 词： | 复杂地形 三角网格 局部渐进传输 遗传算法 |
Local Progressive Transmission Method for Complex Terrain Triangular Me sh |
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| Abstract: | Data transmission is the premise and basis of data share in this high-speed information age,as the spatial information develops from two-dimensional to three-dimensional,there are more and more studies aiming at three-dimensional data operation.The complex structure of 3D data itself has a large amount of data,which brings a lot of limitations to its transmission and use.In order to achieve an efficient transmission of 3D spatial data,this paper proposes a local progressive transmission scheme for complex terrain triangular mesh,which can avoid delivering extra node information that the client screen could not afford.The specific process includes 3 steps.Firstly,the mesh simplification based on edge collapse method is adopted on server side,and the Genetic Algorithm is used for optimization.Secondly when a client establishes a connection with server and asks for spatial data,the simplest mesh will be transferred to the client and according to the client’s partial enlargement operation,the grid nodes at the corresponding position will be expanded at server side and transmitted to the client in real-time.Finally, the client will receive a small amount of grid node information each time and reconstruct to achieve the local ampl ification effect,so as to avoid unnecessary node deployment and transmission.Tests of Genetic Algorithm efficiency and the local progressive transmission time verified the feasibility of the local progressive transmission scheme. |
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| Keywords: | complex terrain triangular mesh local progressive transmission Genetic Algorithm |
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