[Geotools-gt2-users] define projection when overlaying WMS and shapefile in JMapFrame

[George T. <geo...@ya...>]

Hello,
I am looking for some information how to set the projection correctly for a MapContext or JMapFrame, such that all layer overlays are correctly displayed. I am running displayWmsAndShapefile() (code below) to display a shapefile (110m_coastline.shp from http://www.naturalearthdata.com/downloads/110m-physical-vectors/) and the "Ocean Coastline" layer from the WMS at http://atlas.gc.ca/cgi-bin/atlaswms_en?VERSION=1.1.1&Request=GetCapabilities&Service=WMS.

The result shows that the two layers don't match: http://imagebin.org/220454
If I show the shapefile alone, the JMapFrame sets the CRS to GCS_WGS_1984. If I show the WMS alone, the JMapFrame sets the CRS to EPSG:4326. How can I force the JMapFrame to paint everything using EPSG:4326?

More generally, how can I choose the CRS that is requested from a WMS server if the server supports several CRSs? Using a GetMapRequest I could use the setSRS() method. But in the code below there is no GetMapRequest involved. Can I still force the JMapFrame to request the WMS Layer in a different CRS?

Thank you
George

--- code snippet (using geotools-8.0-RC2) ---

  private void displayWmsAndShapefile() throws Exception {
                File sourceFile;
                SimpleFeatureSource featureSource;
                MapContext map;

        sourceFile = JFileDataStoreChooser.showOpenFile("shp", null);
        if (sourceFile == null) {
            return;
        }
        FileDataStore store = FileDataStoreFinder.getDataStore(sourceFile);
        featureSource = store.getFeatureSource();

        // Create a map context and add our shapefile to it
        map = new DefaultMapContext();
        map.addLayer(featureSource, null);
  
        //WMS Stuff:
        URL capabilitiesURL = WMSChooser.showChooseWMS();
        if( capabilitiesURL == null ){
          System.exit(0); // canceled
        }
        WebMapServer wms = new WebMapServer( capabilitiesURL );

        List<Layer> wmsLayers = WMSLayerChooser.showSelectLayer( wms );
        if( wmsLayers == null ){
          JOptionPane.showMessageDialog(null, "Could not connect - check url");
          System.exit(0);
        }

        for( Layer wmsLayer : wmsLayers ){
            WMSMapLayer displayLayer = new WMSMapLayer(wms, wmsLayer );
            map.addLayer( displayLayer );
        }

        // Create a JMapFrame with custom toolbar buttons
        JMapFrame mapFrame = new JMapFrame(map);
        mapFrame.enableToolBar(true);
        mapFrame.enableStatusBar(true);

        // Display the map frame. When it is closed the application will exit
        mapFrame.setSize(800, 600);
        mapFrame.setVisible(true);
    }