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abusedmedia/geo-distance-calc.js

Created November 29, 2022 09:56
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geo-distance-calc.js
const distance = (lat1,lon1,lat2,lon2) => {
lon1 = lon1 * Math.PI / 180
lon2 = lon2 * Math.PI / 180
lat1 = lat1 * Math.PI / 180
lat2 = lat2 * Math.PI / 180
let dlon = lon2 - lon1;
let dlat = lat2 - lat1;
let a = Math.pow(Math.sin(dlat / 2), 2) + Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(dlon / 2),2)
let c = 2 * Math.asin(Math.sqrt(a))
// Radius of earth in kilometers. Use 3956 for miles
let r = 6371
return(c * r)
}
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