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Radial distance between two locations using haversine formula
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export interface Coordinates { | |
latitude: number; | |
longitude: number; | |
} | |
const getRadiansFromDegrees = (degrees: number) => { | |
return (degrees * Math.PI) / 180; | |
}; | |
export const calculateRadialDistanceBetweenCoordinates = ( | |
sourceCoordinates: Coordinates, | |
destinationCoordinates: Coordinates | |
) => { | |
const EARTH_RADIUS_IN_METERS = 6371e3; | |
const sourceLatitudeInRadians = getRadiansFromDegrees( | |
sourceCoordinates.latitude | |
); | |
const destinationLatitudeInRadians = getRadiansFromDegrees( | |
destinationCoordinates.latitude | |
); | |
const latitudeDifference = getRadiansFromDegrees( | |
destinationCoordinates.latitude - sourceCoordinates.latitude | |
); | |
const longitudeDifference = getRadiansFromDegrees( | |
destinationCoordinates.longitude - sourceCoordinates.longitude | |
); | |
const haversineOfCentralAngle = | |
Math.pow(Math.sin(latitudeDifference / 2), 2) + | |
Math.cos(sourceLatitudeInRadians) * | |
Math.cos(destinationLatitudeInRadians) * | |
Math.pow(Math.sin(longitudeDifference / 2), 2); | |
const centralAngle = | |
2 * | |
Math.atan2( | |
Math.sqrt(haversineOfCentralAngle), | |
Math.sqrt(1 - haversineOfCentralAngle) | |
); | |
const distanceInMeters = EARTH_RADIUS_IN_METERS * centralAngle; | |
return Number(distanceInMeters.toFixed(3)); | |
}; | |
export const isDeliveryPartnerInAllowedRange = ( | |
sourceCoordinates: Coordinates, | |
destinationCoordinates: Coordinates, | |
allowedMaxDistanceInMeters: number | |
) => { | |
const radialDistanceInMeters = calculateRadialDistanceBetweenCoordinates( | |
sourceCoordinates, | |
destinationCoordinates | |
); | |
if (radialDistanceInMeters > allowedMaxDistanceInMeters) { | |
return false; | |
} | |
return true; | |
}; |
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