[OpenLayers-Users] Projection problem

[Glenn Mullett]

Hi Zsolt

in your OL map config you have to set the map to 900913 (spherical
mercator) and set the display projection using displayProjection:
(you have to use 900913 if using Google layers ... else nothing is in
the right place)
 
---------------------------------

	var ol_map_options = {
			id: 'map',
			units: "m",
			projection: new OpenLayers.Projection("EPSG:900913"), 		//so
everything fits on Google Earth Layers
    		         displayProjection: new
OpenLayers.Projection("EPSG:4326"),   // what is shown in the bottom
right corner... I usually use 4326 ...
			controls: [
			        new OpenLayers.Control.Navigation(), 
				new OpenLayers.Control.PanZoomBar(), 
				new OpenLayers.Control.ScaleLine(), 
		  		new OpenLayers.Control.MousePosition() //the mouse position
co-ords display
		        ]
		};

map = new OpenLayers.Map('map', ol_map_options);

---------------------------------

then set the projection of your layer that you are adding ( i've used a
vector layer here - but you can change to what you need...):

---------------------------------

           var vector_sites = new OpenLayers.Layer.Vector("sites", 
                        {  styleMap: new OpenLayers.StyleMap(style)   },

                        //set the projection of the layer - this you
would set to "EPSG:23700"
                       {   projection: new
OpenLayers.Projection("EPSG:4326")  }
           ); 
 
map.addLayer(vector_sites);

---------------------------------

Regards
-- 
Glenn Mullett
BTech(Nature Cons) PGDip(UNIGIS)
H.O.D. GIS
Lidwala Consulting Engineers

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On Mon, 2011-08-29 at 09:37 +0200, Magyar Zsolt wrote:
> Dear All,
> 
>  
> 
> I'm sorry for my help request again! I didn’t get any e-mail about
> this problem below somehow. (I think it was up to me, sorry!) 
> 
> Thanks!
> 
>  
> 
> Zsolt
> 
>  
> 
> 
>                                    
> ______________________________________________________________________
> 
> From: Magyar Zsolt 
> Sent: Thursday, August 18, 2011 11:20 AM
> To: 'openlayers-users at lists.osgeo.org'
> Subject: Projection problem
> 
> 
> 
>  
> 
> Please help me!
> 
> http://erdoterkep.mgszh.gov.hu/epsg23700test/eotr_test.html 
> 
> On the map you can see Forestry Directorates of Hungary and some test
> lines. Horizontal coordinates of these lines are exactly 450000,
> 640000 and 880000 in the EPSG:23700 reference system. The problem is -
> as you can see on cursor location bottom right - that the coordinates
> are not correct with google maps. There are 70m difference somewhere.
> 
> The projection is OK, the maps are on the right place, but the
> coordinates are wrong (a bit) somehow.
> 
> On the map of Geoserver Openlayers Layer preview you can see the
> correct coordinates. (see pictures)
> 
>  
> 
> What can I do to make it show the correct coordinate numbers?
> 
>  
> 
> Thanks for advance!
> 
>  
> 
> Zsolt, Magyar
> 
> 
> 
> _______________________________________________
> Users mailing list
> Users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/openlayers-users
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