在空间数据库中，对采用r树类型索引存储的数据集给出了三个查询处理算法。
For data sets indexed by R-trees in spatial databases, three algorithms are presented for answering this kind of query.
该文阐述了在地理信息系统建设过程中，地图数据库、空间数据库的作用与差别。
This paper discussed on the functions and differences of map database and spatial database during the process of geographical information system construction.
本文在简要分析数字城市基础空间数据库构建过程的前提下，详细论述了数字城市基础空间数据建库中需进行的质量控制内容及方法。
In this paper, we analyze the process of building digital city's basic spatial database first, then we introduce some quality control methods in this process.
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