Investigate better mercator projection for google maps
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Key: GEOS-1267
URL: http://jira.codehaus.org/browse/GEOS-1267
Project: GeoServer
Issue Type: Improvement
Affects Versions: 1.6.0-beta2
Reporter: Chris Holmes
Assignee: Andrea Aime
Priority: Critical
Fix For: 1.6.0-beta3
Our current google maps stuff uses a bit of a weird hack - it uses mercator 41001 for zoomed out, and 4326 when zoomed in. Which works ok, but not great.
crschmidt has done some investigation to find out the proper params for the google and virtual earth mercators.
http://crschmidt.net/blog/archives/238/understanding-googles-projection-slightly-anyway/
Which has information for the proj4 params. http://www.sharpgis.net/2007/07/27/TheMicrosoftLiveMapsAndGoogleMapsProjection.aspx has information on the WKT to be used, but when I tried it out it didn't work. I think maybe we need more specific information for our projection stuff?
So we should investigate it, and add to the default configuration for GeoServer. We can use EPSG:54004 or OSGEO:41001 to go with conventions crschmidt has been using.
See also http://www.nabble.com/tilecache-+-google-t4133933.html
and
http://dev.openlayers.org/sandbox/crschmidt/google/examples/google-factbook-tc.html
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