sensormap = Plot.plot({
width,
projection: {
type: projection,
},
marks: [
Plot.geo(countries, {fill: "white", stroke: "lightgray"}),
Plot.sphere({strokeWidth: 1, stroke: "darkgray"}),
Plot.dot(sensors, {x: "longitude", y: "latitude", fill: "#AA44AA", r: 1})
]
});