Because of large amount of spatial data in this operation, it is a critical technique in GIS about how to realize spatial overlap analysis very quickly with higher accuracy.

由于空间数据量较大，如何快速准确地完成空间叠值分析运算是GIS系统中比较关键的技术。

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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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By using GIS method, a wetlands GIS spatial database of Heilongjiang province was built based on collecting a vast amount of wetlands data.

以GIS技术为手段，在收集大量有关湿地材料的基础上，完成了黑龙江省湿地GIS空间数据库的建立。

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