Structure-Level 3D Building Model Encoding Method for Progressive Transmission

Structure-Level 3D Building Model Encoding Method for Progressive Transmission
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渐进式传输的结构级3D建筑模型编码方法

DOI:
10.3390/ijgi10050306
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发表时间:
2021-05
影响因子:
3.4
通讯作者:
Jiangfeng She
Jiangfeng She
中科院分区:
地球科学3区
文献类型:
--
作者:
Jiwei Dong;Junzhong Tan;Qiang Zhao;Lixia He;Sirui Li;Jiangfeng She

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渐进编码和传输,即,作为三维网络地理信息系统(WebGIS)的重要技术基础,解决了海量三维建筑物数据与有限网络传输能力之间的矛盾。大多数渐进式编码算法以顶点、边或三角形为编码单元,可能会破坏三维建筑物模型固有的几何和拓扑特征。因此,提出了一种新型的能够保持内部特征的3D建筑模型编码方法,可用于高效渐进传输。该方法将建筑物分解为三种基本结构:主体结构、独立结构和附属结构。根据结构之间的连接关系构建结构拓扑图(STG)。在STG的指导下,将一个或多个结构包装成最小的增量传输单元,记为传输节点。当请求时,利用视点的实时位置、节点的朝向和视觉重要性来挑选期望的节点进行响应。实验结果表明,该方法在编码三维建筑物模型的同时,能较好地保持建筑物模型的几何和拓扑特征。该方法在服务于传输的同时,不仅有效地降低了传输负载,而且在不同简化级别下为用户提供了更好的建筑外观一致性体验。
Progressive encoding and transmission, i.e., a crucial technical foundation of 3D Web Geographic Information Systems (WebGIS), addresses the contradiction between massive 3D building data and limited network transmission capacity. Most progressive encoding algorithms, taking vertices, edges or triangles as encoding units, may break the inherent geometric and topological characteristics of 3D building models. Thus, a novel 3D building model encoding method that can maintain the internal characteristics is proposed, which can be used for high-efficiency progressive transmission. With this method, each building is decomposed into three types of fundamental structures: main structure, independent structure and attached structure. A structural topology graph (STG) was constructed based on the connections among structures. Guided by STG, one or more structures were wrapped as the smallest incremental transmission unit, denoted as transmission node. When requested, the real-time position of viewpoint, orientation and visual importance of nodes are used to pick up expected nodes for responding. The results confirm that the proposed method can better maintain the geometric and topological characteristics while encoding 3D building models. While serving for transmission, the proposed method not only effectively reduces the transmission load, but also provides users with a better consistency experience on the building appearance at different simplification levels.
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