The development of Web-based global 3D visual system has made progresses.However,there exist few mature and effective ways for managing,transmitting and visualizing massive spatial data.Based on the related work,the p...The development of Web-based global 3D visual system has made progresses.However,there exist few mature and effective ways for managing,transmitting and visualizing massive spatial data.Based on the related work,the paper illustrates the ellipsoidal quadtree technique for rapid access multi-scale and multiple level geographical data,integrates the streaming with level-of-detail rendering method for transmitting the data on the network,and im-plements large-scale terrain surface simplification using M-band wavelet transforms and mul-tiresolution triangulations.We fulfil a web-based global terrain visual system using COM com-ponents on the basis of the above techniques.The system has a good prospect in the military simulation and city plans.展开更多
基金This work was supported by“973”Program(Grant No.G2000077906)Program of Data Fusion for Flood Analysis and Decision Support(ANFAS)863 Program(Grant No.2001AA130020).
文摘The development of Web-based global 3D visual system has made progresses.However,there exist few mature and effective ways for managing,transmitting and visualizing massive spatial data.Based on the related work,the paper illustrates the ellipsoidal quadtree technique for rapid access multi-scale and multiple level geographical data,integrates the streaming with level-of-detail rendering method for transmitting the data on the network,and im-plements large-scale terrain surface simplification using M-band wavelet transforms and mul-tiresolution triangulations.We fulfil a web-based global terrain visual system using COM com-ponents on the basis of the above techniques.The system has a good prospect in the military simulation and city plans.
