Direction is a kind of important spatial relationship, it plays an important role in the process of spatial modeling, spatial query, spatial analyzing and spatial reasoning.
方向关系是一类重要的空间关系，它在空间数据建模、空间查询、空间分析、空间推理等过程中起着重要的作用。
Analyzing the source of spatial data and improving the quality of spatial data are the precondition of building GIS.
分析空间数据来源、提高空间数据质量是建立地理信息系统的前提。
Using the climatic data recorded by the 90 weather stations in Guangxi in 30 years and geographic information of the stations, spatial analyzing models of division index are built.
利用广西90个气象台站30年的气候资料和台站地理信息，建立了区划指标的空间分析模型。
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