基于数据分层分块的海量三维地形四叉树简化模型.pdf

第 39 卷
第 4 期测
绘
学
报 Vol. 39, No. 4
20
10 年 8 月 Acta Geoda etica et Ca rtographica Sinica Aug. , 2010
文章编号: 1001
1595( 2010) 04
0410
06
基于数据分层分块的海量三维地形四叉树简化模型
刘
扬1 , 宫阿都2, 3 , 李
京2, 3
1. 北京建筑工程学院测绘与城市空间信息学院, 北京 100044; 2. 北京师范大学资源学院, 北京 100875; 3. 北京师范
大学民政部教育部减灾与应急管理研究院, 北京 100875
A Model for Massive 3D Terrain Simplification Based on Data Block Partition and Quad
tree
LIU Yang1 , GONG Adu2, 3 , LI Jing2, 3
1. School of Geoma tics a nd Urban Informa tion, Bei jing University of Civil Engineering a nd Architecture, Bei jing 100044, China ;
2. Col lege of Resources Sci ence & Technology, Beijing Norma l University, Beiji ng 100875, Chi na; 3. Aca demy of Disa ster Reduc
tion and Emergency Mana gement Ministry of Civil Affa irs & Mi nistry of Educa ti on, Beiji ng Norma l Universi ty, Bei jing 100875, China
Abstract : A Local Self
a daptive and Optimized Terrain Simplification Model ( LSOTSM) is proposed in this pa per by
comparing severa l typical algorithms on terra in simplifica tion. It can be used a nize massive 3 dimensional
terrain data with multiple terrain quad trees and display them in real time a nd multiple resolutions. And, the pro
posed LSOTSM Model can dynamically split or merge data blocks with qua d tree structures according to viewpoints
as well as the roughness in local terrain, so tha t the different level terrains could be displayed in rea