Due to its large amount of spatial data and highly complex spatial objects and spatial queries, the study of spatial queries become focus of spatial database research.
由于其庞大的空间数据量以及空间物标、空间查询的高度复杂性，空间查询成为空间数据库应用的难点和研究热点。
Due to its large amount of spatial data and highly complex spatial objects and spatial queries, the study of spatial queries become focus of spatial database research.
由于其庞大的空间数据量以及空间物标、空间查询的高度复杂性，空间查询成为空间数据库应用的难点和研究热点。
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