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《Journal of Zhejiang University(Science Edition)》 2019-01
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An integrated index online visualization of geo-scene point clouds on mobiles

QIU Bo;ZHANG Feng;DU Zhenhong;LIU Renyi;ZHANG Shuyu;FAN Xinyi;Zhejiang Provincial Key Lab of GIS,Zhejiang University;Department of Geographic Information Science,Zhejiang University;  
Current research on point clouds organization pays little attention to the performance characteristics of mobile devices.An integrated spatial index is proposed for online visualization of geo-scene point clouds on mobile devices.First,the index adopts an improved KD-tree which accounts for the network bandwidth and rendering performance of mobile terminal to implement a balanced division and coding of point clouds.Then,it builds a LOD model of point clouds and uses an improved Octree to organize the LOD models.Finally,the code of the improved KD-tree is concatenated with the improved Octree to form an optimized index structure of 1 level_1_tree:1 level_2_tree.The proposed index supports LOD-based rendering,determination of spatial relations from data blocks and multi-threading data query.Experiments and analysis show that:compared to the traditional indexes of point clouds,this index has a stable construction efficiency and excellent performance of spatial query.It provides reliable data support for mobile applications and meets the diversified requirements of point clouds online visualization on mobile devices.
【Fund】: 国家自然科学基金资助项目(41471313 41671391);; 国家海洋公益性行业科研专项经费资助(201505003)
【CateGory Index】: TP311.13;P208
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