The design of spatial data accessing engine is the key for object RDMBS to memory and query spatial data.
为使对象关系数据库更方便存储和查询空间数据，空间数据访问引擎的设计是关键。
Building a spatial data accessing engine, it can finish majority works of spatial data and manage big range and multi-scale geographic information.
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。
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