[OpenLayers-Users] Just another trasformation problem ;)

Wed Apr 7 08:16:33 EDT 2010

Thanks, but now my layer is shifted in South Africa!!!

I don't understand what's wrong: the map output the exact coordinates.
Well, I've:
3 base layers -> epsg:900913
1 gml layer    -> epsg:2498
and I want display projection in wgs84

Is my set up (code in my previous mail) correct?

-beppe-

2010/4/7 <bartvde at osgis.nl>

> Hi,
>
> not sure if this is the cause of your problem since I don't know anything
> about EPSG:2498, but can you try adding xy false to your Format.GML:
>
>     var isoline = new OpenLayers.Layer.Vector("isoline", {
>            strategies: [new OpenLayers.Strategy.Fixed()],
>            protocol: new OpenLayers.Protocol.HTTP({
>                url: "../aramus_data/vector/gml/isoipse_2498.gml",
>                projection: epsg2498,
>                 format: new OpenLayers.Format.GML({xy: false})
>           })
>        });
>
> Best regards,
> Bart
>
> > Hi all,
> > I ought to display a map with osm layer as base and a gml file of a
> little
> > part of Armenia.
> > First step was convert my shapefile, with projection epsg:2498, in a gml
> > format (ogr2ogr -f GML ...).
> >
> > Second step was set up my map.
> > Within tag <head> of my html page, I' ve insert a link to these
> libraries:
> >
> > - OpenLayers-2.8/OpenLayers.js
> > - http://www.openstreetmap.org/openlayers/OpenStreetMap.js
> > - proj4js.js
> > - proj4s/lib/defs/EPSG2498.js
> >
> > And this is a snippet of my map code [1].
> >
> > The problem is that my gml is in the north of Africa instead of Armenia.
> > I've tried with qgis and the layer is correctly positioned, so I suppose
> > that the problem is in the code, but I' m not able to detect the bug!!!
> >
> > thanks
> >
> > -beppe -
> >
> > [1] function init() {
> >     var epsg2498= new OpenLayers.Projection("EPSG:2498");
> >     var epsg900913= new OpenLayers.Projection("EPSG:900913");
> >     var epsg4326= new OpenLayers.Projection("EPSG:4326");
> >
> >    var bounds = new OpenLayers.Bounds(44.532, 40.144, 45.038,
> > 40.423).transform(epsg4326, epsg900913);
> >
> >    map = new OpenLayers.Map ("map", {
> >        controls:[
> >            new OpenLayers.Control.Navigation(),
> >            new OpenLayers.Control.LayerSwitcher({activeColor:"#729aa1"}),
> >            new
> > OpenLayers.Control.MousePosition({div:document.getElementById("coord")}),
> >            new OpenLayers.Control.Attribution()],
> >
> >        maxExtent: bounds,
> >        maxResolution: 156543.0399,
> >        numZoomLevels: 5,
> >        minZoomLevel: 3,
> >        maxZoomLevel: 8,
> >        units: 'm',
> >        projection: epsg900913,
> >        displayProjection: epsg2498
> >    } );
> >
> >
> >    var layerCycleMap = new OpenLayers.Layer.OSM.CycleMap("CycleMap");
> >     map.addLayer(layerCycleMap);
> >
> >    var layerTilesAtHome = new
> > OpenLayers.Layer.OSM.Osmarender("Osmarender");
> >    map.addLayer(layerTilesAtHome);
> >
> >    var layerMapnik = new OpenLayers.Layer.OSM.Mapnik("Mapnik");
> >    map.addLayer(layerMapnik);
> >
> >     var isoline = new OpenLayers.Layer.Vector("isoline", {
> >            strategies: [new OpenLayers.Strategy.Fixed()],
> >            protocol: new OpenLayers.Protocol.HTTP({
> >                url: "../aramus_data/vector/gml/isoipse_2498.gml",
> >                projection: epsg2498,
> >                format: new OpenLayers.Format.GML()
> >            })
> >        });
> >    isoline = OpenLayers.Projection.transform(isoline, epsg2498,
> > map.projection);
> >     map.addLayer(isoline);
> > ....
> > ....
> > ....
> > --
> > -beppe-
> > _______________________________________________
> > Users mailing list
> > Users at openlayers.org
> > http://openlayers.org/mailman/listinfo/users
> >
>
>
>

-- 
-beppe-
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