This paper proposes a new concept which is called virtual map on the basis of structure analysis and organization of spatial data.

本文在分析现有空间数据的组织、管理方法的基础上提出虚拟图幅的概念，并详细介绍了基于此对空间数据的组织方法。

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Current and relevant research focused mainly on the traditional two-dimensional maps and static map, and study to three-dimensional virtual map and rotated map relatively less.

目前国内外的相关研究主要集中于对传统的二维地图和固定地图的研究，对三维虚拟地图和可旋转地图的研究还相对较少。

youdao

Current and relevant research focused mainly on the traditional two-dimensional maps and static map, and study to three-dimensional virtual map and rotated map relatively less.

目前国内外的相关研究主要集中于对传统的二维地图和固定地图的研究，对三维虚拟地图和可旋转地图的研究还相对较少。

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