{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
        "format": {
            "feature": "line",
            "type": "topojson"
        },
        "url": "https://vega.github.io/vega-lite/data/londonTubeLines.json"
    },
    "encoding": {
        "color": {
            "field": "id",
            "type": "nominal"
        }
    },
    "height": 500,
    "mark": {
        "filled": false,
        "type": "geoshape"
    },
    "width": 700
}