对地理要素的多尺度表达（多重表达）是当前多尺度空间数据库领域的研究热点之一。
The multi-scale representations (multi-representations) for geographical entities is one of research focuses in the field of multi-scale spatial database.
如何更好地表达、组织与处理全球多尺度空间数据，尤其是海量矢量数据，已成为GIS学者普遍关注的问题。
How to express, organize and process the global multi-scale spatial data better, particularly the massive vector data, has become a problem that attracts common attention from the GIS scholars.
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