geo_constant_value.vl

{
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "data": {
        "url": "https://vega.github.io/vega-lite/data/airports.csv"
    },
    "height": 300,
    "layer": [
        {
            "encoding": {
                "color": {
                    "value": "gray"
                },
                "latitude": {
                    "field": "latitude",
                    "type": "quantitative"
                },
                "longitude": {
                    "field": "longitude",
                    "type": "quantitative"
                },
                "size": {
                    "value": 1
                }
            },
            "mark": "square"
        },
        {
            "encoding": {
                "color": {
                    "value": "steelblue"
                },
                "latitude": {
                    "field": "latitude",
                    "type": "quantitative"
                },
                "longitude": {
                    "datum": -122.335167
                },
                "size": {
                    "value": 1
                }
            },
            "mark": "square"
        },
        {
            "encoding": {
                "color": {
                    "value": "firebrick"
                },
                "latitude": {
                    "datum": 47.608013
                },
                "longitude": {
                    "field": "longitude",
                    "type": "quantitative"
                },
                "size": {
                    "value": 1
                }
            },
            "mark": "square"
        }
    ],
    "projection": {
        "type": "albersUsa"
    },
    "width": 500
}