Le portail francophone de la géomatique

        var zooom = 14;
    map = new OpenLayers.Map('map', {
        //projection: new OpenLayers.Projection("EPSG:900913"),
        projection: 'EPSG:3857',
        layers: [
        new OpenLayers.Layer.Google( //projection possible 3857
            "Google Satellite",
            {type: google.maps.MapTypeId.HYBRID, numZoomLevels: 20,sphericalMercator: true } //
        ),            
        new OpenLayers.Layer.Google( //projection possible 3857
            "Google Cartes",
            {numZoomLevels: 20,sphericalMercator: true}
        ),
        new OpenLayers.Layer.WMS( //projection possible 4326, 2154, 2972, 2975
            "Carte géologique",
            "http://geoservices.brgm.fr/geologie",
            {layers: 'SCAN_D_GEOL50', numZoomLevels: 20}
        ),
        new OpenLayers.Layer.WMS( //projection possible 2154, 27582
            "Carte IGN",
            "http://mapdmz.brgm.fr/cgi-bin/mapserv?map=/carto/infoterre/mapFiles/scan.map",
            {
                srs: 'EPSG:27582',
                displayProjection: "EPSG:4326",
                layers: 'SCAN25',
                format: 'image/Jpeg',
                isBaseLayer: true,
                visibility: true 
            }//,
            //{'reproject': true}
        ),
        new OpenLayers.Layer.WMS(
            "Forages d'eau existant",
            "http://geoservices.brgm.fr/geologie",
            {layers: 'BSS',  transparent: "true", format: "image/png"}
        )
        ],
        center: new OpenLayers.LonLat(lon, lat)
            .transform('EPSG:4326', 'EPSG:3857'),
            zoom: zooom
    });
    
    map.addControl(new OpenLayers.Control.LayerSwitcher({'div':OpenLayers.Util.getElement('layerswitcher')}));
    map.addControl(new OpenLayers.Control.Navigation());
    map.addControl(new OpenLayers.Control.MousePosition({
        separator: ' | ',
        numDigits: 6,
        emptyString: 'Hors de la carte',
        displayProjection: new OpenLayers.Projection("EPSG:4326")
        // EPSG:4326, CRS:84, urn:ogc:def:crs:EPSG:6.6:4326, EPSG:900913, EPSG:3857, EPSG:102113 and EPSG:102100
    }));
    map.addControl(new OpenLayers.Control.ScaleLine());
    zoomuser = map.zoom.toFixed();