The difficulty of unsteady three dimensional vector field data visualization stems from both data representation and management of large volume data.
非定常三维向量场可视化的难点不仅在于数据表现本身，还在于大体积数据的管理和组织。
The Second chapter discusses some common way of data schedule and management of three dimensional scene.
第二章论述了三维数据调度与场景管理的一般方法。
All of these two modules achieve unified management and scheduling about remote sensing images, vector maps, digital elevation models and three-dimensional scene data.
这两个模块的结合，实现了遥感影像、矢量地图、数字高程模型以及三维场景数据的统一管理和调度。
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