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.
构建空间数据访问引擎，实现对大范围、多尺度地理信息的管理和基本操作。
Building a spatial data accessing engine, it can finish majority works of spatial data and manage big range and multi-scale geographic information.
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