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Data in the North American Datum of 1983 (NAD83), WGS 1984, or another geographic coordinate system (GCS) that use the GRS80 ellipsoid are usually close enough to align without correction. If the data are based on a different geographic coordinate system, such as the North American Datum of 1927 (NAD27), ED 50, Amersfoort, or Tokyo then misalignment may be quite noticeable at the local scale.
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A WGS 1984 Web Mercator projected coordinate system and the WGS 1984 Major Auxiliary Sphere geographic coordinate system are included in ArcGIS version 9.3. This sphere-based geographic coordinate system is called 'WGS 1984 Major Auxiliary Sphere'. To emulate the sphere-only Mercator, it is necessary to use a sphere-based geographic coordinate system (GCS) to use the correct Mercator equations. This Mercator projection supports spheres only, unlike the ESRI Mercator implementation, which supports spheres and ellipsoids. Google Maps and Microsoft Virtual Earth use a Mercator projection based on the World Geodetic System (WGS) 1984 geographic coordinate system (datum). These issues are usually most evident at the local scale, such as a local street map. The cause may be geographic (datum) transformation issues. Spatial features from ArcGIS Server may not align correctly with the maps in Google Maps or Microsoft Virtual Earth when overlaid using the ESRI JavaScript extensions. Problem: ArcGIS Server features are not aligning with maps in Google Maps or Microsoft Virtual Earth Description