[Proj] EPSG Code of Google at spatialreference.org

Noel Zinn (cc) ndzinn at comcast.net
Wed Nov 3 04:43:49 EST 2010

Here's another link that provides the mathematics of the Web Mercator 
projection used by Google and Microsoft.  Unlike the Spherical Mercator and 
the Ellipsoidal Mercator (which are conformal), the Web Mercator is 
non-conformal.  Scale factor formulas are given to document this fact.


Noel Zinn, Principal, Hydrometronics LLC
+1-832-539-1472 (office), +1-281-221-0051 (cell)
noel.zinn at hydrometronics.com (email)
http://www.hydrometronics.com (website)

From: "leonidas" <leonidas_liakos at yahoo.gr>
Sent: Wednesday, November 03, 2010 3:17 AM
To: <proj at lists.maptools.org>
Subject: Re: [Proj] EPSG Code of Google at spatialreference.org

> Thank you, Jean-Claude!
> I'll use wgs84 for my script. Google maps api will convert the coords on 
> the
> fly to google mercator. Just found a useful article for me at:
> http://sharpgis.net/post/2007/07/The-Microsoft-Live-Maps-and-Google-Maps-projection.aspx
> http://sharpgis.net/post/2007/07/The-Microsoft-Live-Maps-and-Google-Maps-projection.aspx
> -- 
> View this message in context: 
> http://osgeo-org.1803224.n2.nabble.com/EPSG-Code-of-Google-at-spatialreference-org-tp5698534p5700432.html
> Sent from the PROJ.4 mailing list archive at Nabble.com.
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