export const loadBaseLayers = function () {
    const normalMapm = L.tileLayer('http://t3.tianditu.com/vec_c/wmts?layer=vec&style=default&tilematrixset=c&Service=WMTS&Request=GetTile&Version=1.0.0&Format=tiles&TileMatrix={z}&TileCol={x}&TileRow={y}&tk=4835969e2e9cee1738c11adadf1ddc36', {
          maxZoom: 17,
          minZoom: 5,
          zoomOffset: 1
        })
        const normalMapa = L.tileLayer('http://t0.tianditu.gov.cn/cva_c/wmts?layer=cva&style=default&tilematrixset=c&Service=WMTS&Request=GetTile&Version=1.0.0&Format=tiles&TileMatrix={z}&TileCol={x}&TileRow={y}&tk=4835969e2e9cee1738c11adadf1ddc36', {
          maxZoom: 17,
          minZoom: 5,
          zoomOffset: 1
        })
        const imgMapm = L.tileLayer('http://t0.tianditu.gov.cn/img_c/wmts?layer=img&style=default&tilematrixset=c&Service=WMTS&Request=GetTile&Version=1.0.0&Format=tiles&TileMatrix={z}&TileCol={x}&TileRow={y}&tk=4835969e2e9cee1738c11adadf1ddc36', {
          maxZoom: 17,
          minZoom: 5,
          zoomOffset: 1
        })
        const imgMapa = L.tileLayer('http://t0.tianditu.gov.cn/cia_c/wmts?layer=cia&style=default&tilematrixset=c&Service=WMTS&Request=GetTile&Version=1.0.0&Format=tiles&TileMatrix={z}&TileCol={x}&TileRow={y}&tk=4835969e2e9cee1738c11adadf1ddc36', {
          maxZoom: 17,
          minZoom: 5,
          zoomOffset: 1
        })
    var normalMap = L.layerGroup([normalMapm, normalMapa]),
        imgMap = L.layerGroup([imgMapm, imgMapa]);
    return {"卫星": imgMap, "行政": normalMap}
}
