[OpenLayers-Users] combine 2 different projections map data

Aypes2 apestgas2 at yahoo.com.hk
Thu Jan 7 04:38:54 EST 2010




Marc Jansen-2 wrote:
> 
> Hi Aypes2,
> 
> why don't you reproject your cad files to //EPSG:3785 (EPSG:900913, that 
> is) when you already serve them from a mapserver?
> 
> If you experience problems doing that, the Mapserver mailinglist may help.
> 
> Regards,
> Marc
> 
Hi Marc,

Thanks for your reply. You mean putting "init="epsg=3785" in the Map file?
I've done this and also modified the ms4w/proj/nad/epsg file. But it changes
nothing. Does the projection epsg change the longitude and latitude into
related coordinates? But my CAD files have been already stored in
coordinates not in Lon Lat. Is there any function to transform between
coordinates of different coordinates? I just can't find any command or
function to make it back to Lon Lat.

Actually I want to change google map rather than my own because reprojecting
my map data make the system run slower. 

Thanks,
Aypes2
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