本文对空间区域聚集查询进行了深入的研究，提出了两级物化的方法，该方法能有效地在空间维和非空间维上进行区域聚集查询。
This paper analyzes the spatial range aggregate queries, and presents the two-stage materialized method. It processes efficiently range aggregate queries on spatial and non-spatial dimension.
本文对空间区域聚集查询进行了深入的研究，提出了两级物化的方法，该方法能有效地在空间维和非空间维上进行区域聚集查询。
This paper analyzes the spatial range aggregate queries, and presents the two-stage materialized method. It processes efficiently range aggregate queries on spatial and non-spatial dimension.
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