How to use @turf/great-circle - 3 common examples
To help you get started, we’ve selected a few @turf/great-circle examples, based on popular ways it is used in public projects.
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Vizzuality / trase / frontend / scripts / react-components / shared / world-map / world-map.selectors.js View on Github 
function buildGreatCircleArc(originCoords, destinationCoords, worldMapProjection) {
if (isEqual(originCoords, destinationCoords)) {
return null;
}
const arc = greatCircle(originCoords, destinationCoords, { offset: 400, npoints: 100 });
if (arc.geometry.type === 'MultiLineString') {
return buildCustomArc(originCoords, destinationCoords, worldMapProjection);
}
const pathMaker = geoPath().projection(worldMapProjection);
return pathMaker(arc);
}type: 'Feature',
properties: {},
geometry: {
type: 'LineString',
coordinates: [[start.longitude, start.latitude], [end.longitude, end.latitude]],
},
}
const lengthKm = length(rawFeature, { units: 'kilometers' })
const lengthNmi = lengthKm / 1.852
const lengthKmFormatted = lengthKm.toFixed(lengthKm > 100 ? 0 : 1)
const lengthNmiFormatted = lengthNmi.toFixed(lengthNmi > 100 ? 0 : 1)
const finalFeature =
lengthKm < 100
? rawFeature
: greatCircle([start.longitude, start.latitude], [end.longitude, end.latitude])
finalFeature.properties.label = `${lengthKmFormatted}km - ${lengthNmiFormatted}nmi`
finalFeature.properties.isNew = isNew
return finalFeature
}transformLineToArcs: (coordinates, options = {npoints: 100, offset: 10, properties: {}}) => {
let arcs = [];
for (let i = 0; i < coordinates.length - 1; ++i) {
const p1 = coordinates[i];
const p2 = coordinates[i + 1];
const start = toPoint(p1);
const end = toPoint(p2);
if (!(p1[0] === p2[0] && p1[1] === p2[1])) {
let grCircle = greatCircle(start, end, options);
arcs = [...arcs, ...grCircle.geometry.coordinates];
}
}
return arcs;
},
transformArcsToLine: (coordinates, npoints = 100) => {
