[Mapserver-users] wms server projection

[Tyler Mitchell]

I'm not exactly sure what you mean, but maybe this will help.

Are you only using EPSG codes in your PROJECTION objects of the map file?
You don't have to!  You can use all the parameters that an EPSG 
encapsulates.  For example, these two entries are identical:

PROJECTION
  "proj=omerc"
  "lat_0=46.9524056"
  "lon_c=7.4395833"
  "alpha=90"
  "k=1"
  "x_0=600000"
  "y_0=200000"
  "ellps=bessel"
  "units=m"
  "no_defs"
END


PROJECTION
  "init=EPSG:21781"
END

You can see why the later is often used :)

You should then be able to modify any of those parameters to suit your 
likings.

Hope that helps. 
Tyler

mapserver-users-admin at lists.gis.umn.edu wrote on 07/01/2004 12:48:14 AM:

> Hi all
> 
> I have a umn mapserver 4.2 wms-server and chameleon.
> I would include a layer of this wms server. The projection of the 
> layer has an 
> alpha value of 90 (init=epsg:21781), which produces an error.
> <21781> +proj=omerc +lat_0=46.95240555555556 
+lonc=7.439583333333333+alpha=90 
> +k=1 +x_0=600000 +y_0=200000 +ellps=bessel +units=m +no_defs  no_defs <>
> 
> so I would change the  alpha value to 89, but how can I include the 
> projection 
> in the mapfile withaout an entry  like 
> "init=epsg:21781"
> ?
> 
> Is it possible to create my own projection in the web part of the 
mapfile?
> Should I create an own file with my own projection like a 'epsg', 
'esri', ... 
> file (the server and the client could then use the same projection 
file)?
> 
> Which is the best way?
> 
> Thanks in advance
> 
> Markus Schnider
> 
> PS: Chameleon or the wms-server works at this time only if the 
alphavalue is 
> different of 90. So I changed the projection to this values.
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