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geo-dist-calc

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geo-dist-calc

CreatedOn- 07/06/2016
1.sourcePoints is an object containing latitude,longitude of a one point(start point).
2.destinationPoints is an object containing latitude,longitude of a another point(end point).
3.Get the latitude and longitude of both the points.
4.Get the Radius of earth which is approximate to 6371 km.
5.calculate the difference of two lat long.
6.apply the ‘haversine’ calculation.

Installation npm install geo-dist-calc

var distance = require('geo-dist-calc'); var sourcePoints = { latitude: 32.123, longitude: 43.21 }; var destinationPoints = { latitude: 67.331, longitude: 56.214 };

var ResultantDistance = distance(sourcePoints,destinationPoints); //ResultantDistance will be in km

// Nuts and bolts of the method var destinationLat = destinationPoints.latitude; var destinationLong = destinationPoints.longitude; var sourceLat = sourcePoints.latitude; var sourceLong = sourcePoints.longitude;

var earthRadius = 6371; // km

var latitudeDiff = destinationLat-sourceLong; var dLat = latitudeDiff.toRad();
var longitudeDiff = destinationLong-sourceLong; var dLon = longitudeDiff.toRad();

var a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(sourceLat.toRad()) * Math.cos(destinationLat.toRad()) * Math.sin(dLon/2) * Math.sin(dLon/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); var d = earthRadius * c; d = Math.round(d);

// toRad() is a method prototyped form Number, do it like this

Number.prototype.toRad = function() { return this * Math.PI / 180; };

// Or you can use Math.PI/180 inplace of toRad()