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FAQ: What is the correct WKID for the sphere-based Web Mercator projection?

Question

What is the correct WKID for the sphere-based Web Mercator projection?

Answer

900913 is used as a well-known ID (WKID) by some Web services for the spherical Mercator-based coordinate system used by Bing maps and Google maps. The 900913 value is a representation of the Google name and originated in the blog entry, Google Projection: 900913. It is often used with an authority name of EPSG, EPSG:900913, but this is incorrect. The EPSG Geodetic Parameter Dataset does not have an entry for 900913. The current EPSG entry for this Mercator-based coordinate system is 3857.

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