Returns a tile from a layer.

Returns a 256x256 tile from a layer in JPEG or PNG format. __IMPORTANT:__ whatever the requested image format is, a transparent image will be delivered in PNG format if no tile is found at the specified location. __Example__: https://view-bm.api.oneatlas.airbus.com/basemap/wmts?layer=advancedBasemap&style=default&tilematrixset=3857&Service=WMTS&Request=GetTile&Version=1.0.0&Format=image/unknown&TileMatrix=18&TileCol=132063&TileRow=95710