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Yes it is just the same. Web Mercator goes by 3 different srids (900913 and 3857 being two of them). I'm puzzled you don't have it. 3857 as I recall has been packaged with PostGIS for quite some time. Which PostGIS version are you running? SELECT postgis_full_version();


There is a shapefile in your Arc install location Desktop10.1\Reference Systems called UTM.shp, refer to that for the zone and use WGS84 UTM Zone XX (North) because you are north of the equator, replace XX with the zone number from the shapefile. This will be compatible with your geographic coordinate system and will project easily. As a SRID all WGS84/UTM ...

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