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OrthoExtentWmts = [-45587.1046212102519348, 6099959.5292354244738817, 1114835.9168208704795688, 7358451.4553877515718341];
var Resolutions_L93= [
    104579.2245498940,
    52277.5323537905,
    26135.4870785954,
    13066.8913818000,
    6533.2286041135,
    3266.5595244627,
    1633.2660045974,
    816.6295549860,
    408.3139146768,
    204.1567415109,
    102.0783167832,
    51.0391448966,
    25.5195690743,
    12.7597836936,
    6.3798916360,
    3.1899457653,
    1.5949728695,
    0.7974864315,
    0.3987432149,
    0.1993716073,
    0.0996858037,
    0.0498429018
];

    var WMS_ORTHO = new ol.layer.Tile({
            source : new ol.source.WMTS({
                url: "https://tile.geobretagne.fr/gwc02/service/wmts",
                layer: "satellite",
                matrixSet: "EPSG:2154",
                format: "image/jpeg",
                //style: "normal",
                tileGrid : new ol.tilegrid.WMTS({
                    origin: ol.extent.getBottomLeft(OrthoExtentWmts),// topLeftCorner
                    resolutions: Resolutions_L93, // résolutions
                     matrixIds: ["EPSG:2154:0","EPSG:2154:1","EPSG:2154:2","EPSG:2154:3","EPSG:2154:4","EPSG:2154:5","EPSG:2154:6","EPSG:2154:7","EPSG:2154:8","EPSG:2154:9","EPSG:2154:10","EPSG:2154:11","EPSG:2154:12","EPSG:2154:13","EPSG:2154:14","EPSG:2154:15","EPSG:2154:16","EPSG:2154:17","EPSG:2154:18","EPSG:2154:19","EPSG:2154:20","EPSG:2154:21"]// ids des TileMatrix
                 })
            }),
            minResolution: 0,
            maxResolution: 2.2,
            isBaseLayer: true,
            visible: true
        });