Because of the particularity of spatial data, the traditional spatial data management methods couldn't deal with spatial data and attribute data at the same time effectively.
由于空间数据的特殊性，传统的空间数据管理方法都不能很好地处理空间数据与属性数据这两种异质数据。
Spatial data have the characteristics of huge quantity, the high correlation between attribute data and spatial data, and the different data types with the different reflective geographical entities.
但空间数据具有数据量巨大，结构复杂，属性数据与空间数据密切相关，并随其反映的地理特性不同而具有不同的数据类型等特点。
With ADO and DAO as database access interface, this system makes the connection between attribute data and spatial data, and the updating of database information come true.
系统采用ADO和DAO作为外部数据访问接口，实现属性数据与空间数据的连接和数据库信息的更新。
With ADO and DAO as database access interface, this system makes the connection between attribute data and spatial data, and the updating of database information come true.
系统采用ADO和DAO作为外部数据访问接口，实现属性数据与空间数据的连接和数据库信息的更新。
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