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

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Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Key Laboratory for Land Satellite Remote Sensing Applications of Ministry of Natural Resources, School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China
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Jiangsu Center for Collaborative Innovation in Novel Software Technology and Industrialization, Nanjing University, Nanjing 210023, China
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Academic Editors: Filiberto Chiabrando and Wolfgang Kainz
ISPRS Int. J. Geo-Inf. 2021, 10(5), 306; https://doi.org/10.3390/ijgi10050306
Received: 7 April 2021 / Revised: 26 April 2021 / Accepted: 2 May 2021 / Published: 6 May 2021
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. View Full-Text
Keywords: 3D building model; progressive encoding; structure extraction; structural topology graph 3D building model; progressive encoding; structure extraction; structural topology graph
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MDPI and ACS Style

Dong, J.; Tan, J.; Zhao, Q.; He, L.; Li, S.; She, J. Structure-Level 3D Building Model Encoding Method for Progressive Transmission. ISPRS Int. J. Geo-Inf. 2021, 10, 306. https://doi.org/10.3390/ijgi10050306

AMA Style

Dong J, Tan J, Zhao Q, He L, Li S, She J. Structure-Level 3D Building Model Encoding Method for Progressive Transmission. ISPRS International Journal of Geo-Information. 2021; 10(5):306. https://doi.org/10.3390/ijgi10050306

Chicago/Turabian Style

Dong, Jiwei, Junzhong Tan, Qiang Zhao, Lixia He, Sirui Li, and Jiangfeng She. 2021. "Structure-Level 3D Building Model Encoding Method for Progressive Transmission" ISPRS International Journal of Geo-Information 10, no. 5: 306. https://doi.org/10.3390/ijgi10050306

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