{
    "transform": [
        {
            "filter": "datum.latitude != '' && datum.county != 'Honolulu' && datum.state !='AS'&& datum.state !='FM'&& datum.state !='PW'&& datum.state !='MH'&& datum.state !='GU'&& datum.state !='MP'&& datum.state !='VI'&& datum.state !='PR'"
        },
        {
            "as": "digit3",
            "calculate": "substring(datum.zip_code, 0, 3)"
        },
        {
            "as": "ziplen",
            "calculate": "length(datum.zip_code+' ')"
        }
    ],
    "height": 600,
    "config": {
        "view": {
            "stroke": null
        },
        "title": {
            "fontSize": 28,
            "font": "Roboto",
            "fontWeight": 300
        }
    },
    "mark": {
        "strokeWidth": 0.2,
        "interpolate": "monotone",
        "type": "line"
    },
    "data": {
        "url": "https://vega.github.io/vega-lite/data/zipcodes.csv"
    },
    "width": 1000,
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "projection": {
        "type": "albersUsa"
    },
    "title": "US connected zip codes, coloured by first three digits",
    "encoding": {
        "color": {
            "field": "digit3",
            "type": "nominal",
            "legend": null
        },
        "latitude": {
            "field": "latitude",
            "type": "quantitative"
        },
        "longitude": {
            "field": "longitude",
            "type": "quantitative"
        },
        "order": {
            "field": "zip_code",
            "type": "quantitative"
        },
        "detail": {
            "field": "ziplen",
            "type": "nominal"
        }
    }
}