This paper mainly emphases how to make the VGI as an effective data source of professional survey department to detect the changed for updating.
本文的研究重点在于如何将自发地理信息作为专业测绘部门发现变化和数据更新的有效数据来源。
All of that volunteered geographic information ( VGI as Michael Goodchild calls it) should be brought into geographic information systems so that we can understand it.
所有的自愿提供的地理信息应该将其保存在地理信息系统里,以便我们能理解它。
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