haversine-position/dist/haversine.js

Convert GPS coordinates into local coordinate system relative to the origin with output of [x, y] in meter, bearing(degree) and distance(m)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const util_1 = require("./util");
const wgs84 = require('wgs84');
class Haversine {
    constructor(origin) {
        this.R = wgs84.RADIUS;
        this.origin = origin;
    }
    /**
     * Get the distance of the next point relative to the origin
     * @param origin the origin gps coordinate
     * @param next next gps coordinate
     * @returns distance in meter (m)
     */
    static getDistance(origin, next) {
        const haversine = new Haversine(origin);
        return haversine.getDistance(next);
    }
    /**
     * Get the bearing of the next point relative to the origin
     * @param origin the origin gps coordinate
     * @param next next gps coordinate
     * @returns bearing in degree (deg)
     */
    static getBearing(origin, next) {
        const haversine = new Haversine(origin);
        return haversine.getBearing(next);
    }
    /**
     * Get the next gps coordinate position relative to the origin
     * @param origin the origin gps coordinate
     * @param next the next gps coordinate
     * @returns [x, y] in meter (m) relative to the origin
     */
    static getPosition(origin, next) {
        const haversine = new Haversine(origin);
        return haversine.getPosition(next);
    }
    /**
     * Get the next gps coordinate position relative to the origin
     * @param next the next gps coordinate
     * @returns [x, y] in meter (m) relative to the origin
     */
    getPosition(next) {
        const distance = this.getDistance(next);
        const bearing = this.getBearing(next);
        const x = distance * Math.sin(util_1.Util.toRadian(bearing));
        const y = distance * Math.cos(util_1.Util.toRadian(bearing));
        return [x, y];
    }
    /**
     * Get the distance of the next point relative to the origin
     * @param next next gps coordinate
     * @returns distance in meter (m)
     */
    getDistance(next) {
        const dLat = util_1.Util.toRadian(next.lat - this.origin.lat);
        const dLong = util_1.Util.toRadian(next.lng - this.origin.lng);
        const lat1 = util_1.Util.toRadian(this.origin.lat);
        const lat2 = util_1.Util.toRadian(next.lat);
        const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
            Math.sin(dLong / 2) * Math.sin(dLong / 2) * Math.cos(lat1) * Math.cos(lat2);
        const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        return this.R * c;
    }
    /**
     * Get the bearing of the next point relative to the origin
     * @param next next gps coordinate
     * @returns bearing in degree (deg)
     */
    getBearing(next) {
        const lat1 = util_1.Util.toRadian(this.origin.lat);
        const lat2 = util_1.Util.toRadian(next.lat);
        const long1 = util_1.Util.toRadian(this.origin.lng);
        const long2 = util_1.Util.toRadian(next.lng);
        const y = Math.sin(long2 - long1) * Math.cos(lat2);
        const x = Math.cos(lat1) * Math.sin(lat2) -
            Math.sin(lat1) * Math.cos(lat2) * Math.cos(long2 - long1);
        return (util_1.Util.toDegree(Math.atan2(y, x)) + 360) % 360;
    }
}
exports.Haversine = Haversine;
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