Google Maps投影在ArcGIS中的设置

Google Maps采用的地图投影为Web Mercator,其优点为不同维度其形状保持不变,当然面积要发生变化。

 

ArcGIS9.3中可以直接设置为WGS 1984 Web Mercator,操作序列为:
Predefined > Projected Coordinate Systems > World > WGS 1984 Web Mercator

 

ArcGIS10中可以直接设置为WGS 1984 Web Mercator (Auxiliary Sphere) ,操作序列为:
Predefined > Projected Coordinate Systems > World > WGS 1984 Web Mercator (Auxiliary Sphere)

 

两者的区别见帮助解释如下:
The WGS 1984 Web Mercator (Auxiliary Sphere) coordinate system is an equivalent coordinate system that simplifies the datum transformations required for some datasets.

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