{
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            "type": "raster",
            "tiles": [
                "https://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Dark_Gray_Base/MapServer/tile/{z}/{y}/{x}"
            ]
        },
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            "type": "image",
            "url": "https://services.arcgisonline.com/arcgis/rest/services/World_Terrain_Base/MapServer/tile/0/0/0",
            "coordinates": [
                [-180, 90],
                [180, 90],
                [180, -90],
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            ]
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    },
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        { "id": "basemap", "source": "basemap", "type": "raster" },
        {
            "id": "image",
            "source": "image",
            "type": "raster",
            "paint": { "raster-opacity": 0.5 }
        }
    ]
}