[mapserver-users] OpenLayers & Projection

[Julien-Samuel Lacroix]

Hi,

Since your problem is related to OpenLayers you may get more help from 
the OpenLayers Users mailing-list.

Anyway, to have OpenLayers call the right projection use (replace 
EPSG:12345 by your actual projection code):

var options =
             {
                  scales: [3500000, 
3000000,2500000,2000000,1500000,1000000,350000,250000],
                  maxScale: 250000,
                  minScale: 3500000,
                  projection:"EPSG:12345",
                  displayProjection: "EPSG:4326",
                  units: "m",
                  controls: [new OpenLayers.Control.MouseDefaults()]
             };

Julien

Clemiou wrote:
> Hi!
> 
> I provide you my OpenLayers code.
> 
> function init()
>         {
>             OpenLayers.DOTS_PER_INCH = 72;
>             
>             // --------------------------------------------------------------------------//
>             // Tableau des options pour la carte.                                          //
>             // La plus importante est scales qui permet de definir les différents zooms  //
>             // qui seront disponibles pour l'utilisateur.                                //
>             // --------------------------------------------------------------------------//
>             
>             var options = 
>             {
>                  scales: [3500000, 3000000,2500000,2000000,1500000,1000000,350000,250000],
>                  maxScale: 250000,
>                  minScale: 3500000,
>                  controls: [new OpenLayers.Control.MouseDefaults()]
>             };
>              
>             // -------------------------//
>             // Création de l'objet map. //
>             // -------------------------//
>                           
>             map = new OpenLayers.Map( 'map',options);
>             
>             // ----------------------------------------------//
>             // On ajoute les couches après les avoir créées. //
>             // ----------------------------------------------// 
>             
>             layer = new OpenLayers.Layer.MapServer( "OpenLayers WMS", 
>                     "http://localhost/cgi-bin/mapserv?mode=map&map=/var/www/html/ms/map_files/france.map", {layers: ['FRANCE','CORSE']},
>                     {gutter: 0    });
>                         
>             map.addLayer(layer);
>                      
>             
>         }
> 
>             // -----------------------------------------------------------------------//
>             // Ajout de la barre de zoom et des coordonnées de la position actuelle.  //
>             // -----------------------------------------------------------------------//
>           
>             map.addControl( new OpenLayers.Control.PanZoomBar() );
>             
>             // ------------------------------//
>             // Ajout de la gestion du click. //
>             // ------------------------------//
>            
>                var click = new OpenLayers.Control.Click();
>                 map.addControl(click);
>                 click.activate();
>             
>             // ---------------------------------------------------------------------------//
>               // Et on définit le centre de notre carte, afin qu'elle sot bien positionnée. //
>               // ---------------------------------------------------------------------------//
>               
>             map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
> 
> 
> 
> And my mapfile has the good projections block, one for the map and one 
> for each layer. Consequently, it works with mapserver & without OL.
> 
> Regards.
> 
> Clement
> 
> 
> 
> ------------------------------------------------------------------------
>  > Date: Tue, 29 Apr 2008 15:43:32 -0400
>  > From: jlacroix at mapgears.com
>  > To: clems_mars at hotmail.com
>  > CC: mapserver-users at lists.osgeo.org
>  > Subject: Re: [mapserver-users] OpenLayers & Projection
>  >
>  > Hi,
>  >
>  > You can take a look at how projection are set in OpenLayers:
>  >
>  > http://trac.openlayers.org/wiki/FrequentlyAskedQuestions#Projections
>  >
>  > Or at the Source of the OpenLayers projection example:
>  > http://www.openlayers.org/dev/examples/projected-map.html
>  >
>  > You will also need to define the PROJECTION block at the layer level and
>  > at the map level in your mapfile.
>  >
>  > Julien
>  >
>  > PS: Please provide revelent mapfile part and revelent code when asking a
>  > question it will help us figuring out what may be your problem.
>  >
>  > Clemiou wrote:
>  > > Hi all!
>  > >
>  > > I come back here because I always have the same problem.
>  > > So, I have a .ewc file which represent the France. This file is in 
> Lambert II (French position, centered on France).
>  > > Currently, I display this map with WGS84 projection but naturally, 
> my map is distorded because this projection is centered on the equator.
>  > > So, if I try to displaying my map with the Lambert II projection, I 
> obtain the following figure:
>  > >
>  > > 
> http://www.forumsig.org/attachment.php?attachmentid=2286&stc=1&d=1208951661 
> <http://www.forumsig.org/attachment.php?attachmentid=2286&stc=1&d=1208951661>
>  > >
>  > > As you can see, there is a malfunction=> the repetition of a part 
> of each tile.
>  > >
>  > > I tried to add projection and units options to my map but nothing 
> change. I think that is a OpenLayers probleme because my map is 
> correctly display with Mapserver and without OL.
>  > > Perhaps someone here should help me.
>  > >
>  > > Thanks for your futur help and once more, excuse me for my English.
>  > >
>  > > Have a nice day
>  > >
>  > > Clement
>  > >
>  > >
>  > > 
> ------------------------------------------------------------------------
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>  > >
>  > > 
> ------------------------------------------------------------------------
>  > >
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>  >
>  > --
>  > Julien-Samuel Lacroix
>  > Mapgears
>  > http://www.mapgears.com/
> 
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-- 
Julien-Samuel Lacroix
Mapgears
http://www.mapgears.com/