WMS and reprojection

[François Prunayre]

Hi (again) Vincent, 

If you have a look to epsg file contained in proj 4.4.9 package :
# NTF (Paris) / Lambert zone II
<27572> +proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=-2.33722917 +k_0=0.99987742
+x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515
+towgs84=-168,-60,320,0,0,0,0 +pm=paris +units=m +no_defs  <>
# NTF (Paris) / France II
<27582> +proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=-2.33722917 +k_0=0.99987742
+x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515
+towgs84=-168,-60,320,0,0,0,0 +pm=paris +units=m +no_defs  <>

Looks the same ... If you look to Lambert II Etendu (ie. France II)
parameters
http://www.ign.fr/telechargement/education/fiches/geodesie/projections.pdf
It seems that for Lambert II zone 27572, y_0 should be 200000 and lon_0, 0 ?
And for France II lon_0 should be 0 ! Anyone using French coordinate systems
having the same troubles ?

I'm currently using these parameters for France II.
<27582> +proj=lcc +lat_1=46.8 +lat_0=46.8 +lon_0=0 +k_0=0.99987742
+x_0=600000 +y_0=2200000 +a=6378249.2 +b=6356515
+towgs84=-168,-60,320,0,0,0,0 +pm=paris +units=m +no_defs  <>

Any ideas ? 

Francois

> -----Message d'origine-----
> De : UMN MapServer Users List
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU] De la
> part de vincent.dacol
> Envoyé : mercredi 25 mai 2005 11:40
> À : MAPSERVER-USERS at LISTS.UMN.EDU
> Objet : [UMN_MAPSERVER-USERS] WMS and reprojection
>
> Hi everybody,
>
> I'm a student and I'm disovering the world of Mapserver and 
> interoperabillity.
>
> I'm trying to use 2 WMS services in different projections,
and one client to
> display two layer from that server.
>
> But the reprojection didn't work in the client. The 2 layer
obtain with the
> 2 WMS server aren't display in the same projection.
>
> The projection of my WMS server 1 is "init=epsg:27571"
> The projection of my WMS server 2 is "init=epsg:27582"
>
> This two server can serv :
> "wms_srs"      "EPSG:27582 EPSG:27571"
>
> The projection I want to display with the client is
"init=epsg:27582"
>
> When I use the 2 layers in local, there is no supperposition
problem, the
> picture obtain was fine, the reprojection work.
>
> But with the WMS client, the first layer is in it's own
projection, and the
> second too. So the 2 layer arn't supperposed, it seem there
is no
> reprojection.
>
> Is-it a reprojection probleme?
>
> My opignon is that a single mapfile with multiple
connections to different
> WMS server must only connect to server who are in the same
projection.
>
> Maybe I'm wrong, I really new to Mapserver, but I have spend
a lot of time
> one this probleme, and the only solution I have find the
solve it is to use
> the same output projection in the client and in the WMS server.
>
> But this solution isn't very logical for me. I want to
connect to a server
> who use is own projection, and can serve data in other
predefined EPSG
> projection. So a WMS client use a WMS layer has a local
layer, with is own
> projection output, and is abble to reproject the data obtain
in the WMS
> layer.
>
>
> Thanks for the help (I really need it).
>
> Vincent
>
> Accédez au courrier électronique de La Poste : www.laposte.net ;
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>
>
>
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Accédez au courrier électronique de La Poste : www.laposte.net ;
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Les donnees et renseignements contenus dans ce message sont personnels, confidentiels et prives. Toute publication, utilisation ou diffusion, meme partielle, doit etre autorisee.

Any data and information contained in this electronic mail is personal, confidential and secret. Any total or partial publication, use or distribution must be authorized.