| 1 | /**
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| 2 | * Calculate the distance in Km
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| 3 | * Sourced from StackOverflow (https://stackoverflow.com/questions/27928/calculate-distance-between-two-latitude-longitude-points-haversine-formula)
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| 4 | * This is the 'fastest' algorithm apparently
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| 5 | *
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| 6 | * @param lat1
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| 7 | * @param lon1
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| 8 | * @param lat2
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| 9 | * @param lon2
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| 10 | * @returns number The distance in km
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| 11 | */
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| 12 |
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| 13 | export function getDistanceFromLatLonInKm(
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| 14 | lat1: number,
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| 15 | lon1: number,
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| 16 | lat2: number,
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| 17 | lon2: number
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| 18 | ): number {
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| 19 | var p = 0.017453292519943295; // Math.PI / 180
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| 20 | var c = Math.cos;
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| 21 | var a =
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| 22 | 0.5 -
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| 23 | c((lat2 - lat1) * p) / 2 +
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| 24 | c(lat1 * p) * c(lat2 * p) * (1 - c((lon2 - lon1) * p)) / 2;
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| 25 |
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| 26 | return 12742 * Math.asin(Math.sqrt(a)); // 2 * R; R = 6371 km
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| 27 | } |
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