@ue-too/border / greatCircleDistance

Function: greatCircleDistance()

greatCircleDistance(startCoord, endCoord): number

Defined in: greateCircle.ts:155

Calculates the great circle distance between two points on Earth.

Parameters

startCoord

GeoCoord

The starting geographic coordinate

endCoord

GeoCoord

The ending geographic coordinate

Returns

number

The distance in meters

Remarks

Uses the haversine formula to calculate the shortest distance over Earth's surface between two geographic coordinates. This is the "as-the-crow-flies" distance.

The calculation assumes Earth's mean radius of 6,371,000 meters and treats Earth as a perfect sphere.

Example

const nyc = { latitude: 40.7128, longitude: -74.0060 };
const london = { latitude: 51.5074, longitude: -0.1278 };

const distance = greatCircleDistance(nyc, london);
console.log('Distance:', distance / 1000, 'km'); // ~5570 km