Le portail francophone de la géomatique

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var map = new ol.Map({
        layers: [
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                source : new ol.source.WMTS({
                    url: 'https://wxs.ign.fr/decouverte/geoportail/wmts?SERVICE=WMTS&REQUEST=GetCapabilities',
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                    tileGrid : new ol.tilegrid.WMTS({
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