Description: Because of the traditional paper-based management of virtual terrain landscape roaming system in data security, multi-user, network and data-sharing, such as dynamic update has been unable to meet the number of cities or digital terrestrial integration of massive spatial data management and online real-time applications requirements. Based on Oracle database DEM Massive dynamic visualization methods, including the pyramid structure of the data organization mechanism, the use of the data page of the dynamic scheduling techniques, with the view-dependent terrain simplification and Multithread-based progressive portray technology. According to the National 1:25 million scale DEM database application experiment shows that this method is feasible and can be extended to imaging, as well as other model data integration applications.
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