s-haversine/index.js

Get distance between any two latitute/longitude coordinates

"use strict";
exports.__esModule = true;
/**
* Convert degrees to radians
*/
function degreesToRadians(deg) {
    return deg * (Math.PI / 180);
}
exports.degreesToRadians = degreesToRadians;
/**
* Convert dms (degrees/minutes/seconds) string to decimal degrees
*   toDecimal(`40 20 50W`)   => -40.34722
*   toDecimal(`40°20'50" S`) => -40.34722
*/
function dmsToDecimal(str) {
    var lastChar = str.slice(-1).toLowerCase();
    var negative = false;
    // south and west => negative
    if (lastChar === 'w' || lastChar === 's')
        negative = true;
    // convert strings to numbers
    var values = str
        .split(/[^0-9.]/)
        .filter(function (x) { return x !== ''; }) // remove empty values
        .map(function (x) { return parseFloat(x); });
    // make sure array has length 3
    for (var i = 0; i < 3; i++) {
        values[i] = values[i] || 0;
    }
    var result = values[0] + (values[1] / 60) + (values[2] / 3600);
    return negative ? -result : result;
}
exports.dmsToDecimal = dmsToDecimal;
var haversine = {
    /**
    * Configurable earthRadius (in meters)
    */
    earthRadius: 6371000,
    /**
    * Get distance between two points
    */
    distance: function (coords1, coords2) {
        var lat1 = coords1[0], lon1 = coords1[1];
        var lat2 = coords2[0], lon2 = coords2[1];
        var latitudeDifference = degreesToRadians(lat2 - lat1);
        var logitudeDifference = degreesToRadians(lon2 - lon1);
        var n = Math.sin(latitudeDifference / 2) * Math.sin(latitudeDifference / 2) +
            Math.cos(degreesToRadians(lat1)) * Math.cos(degreesToRadians(lat2)) *
                Math.sin(logitudeDifference / 2) * Math.sin(logitudeDifference / 2);
        var distance = 2 * Math.atan2(Math.sqrt(n), Math.sqrt(1 - n));
        return this.earthRadius * distance;
    },
    dmsToDecimal: dmsToDecimal
};
exports["default"] = haversine;