In most GIS nowadays, the spatial data store in the files created by itself while the attribute data store in the relation-database.
当前大多数的GIS系统中,空间数据放在自建的文件中,属性数据放在关系数据库中。
As it is impossible to unify the formats of the files provided by different GISs, the processing of GIS data is onerous when designing the GIS interface.
由于无法统一不同GIS提供的数据文件格式,在进行接口设计时对GIS数据的处理工作十分繁杂。
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