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Viewing file:     CRS.Earth.js (1.11 KB)      -rwxrwxr-x

import {CRS} from './CRS';
import * as Util from '../../core/Util';

/*
 * @namespace CRS
 * @crs L.CRS.Earth
 *
 * Serves as the base for CRS that are global such that they cover the earth.
 * Can only be used as the base for other CRS and cannot be used directly,
 * since it does not have a `code`, `projection` or `transformation`. `distance()` returns
 * meters.
 */

export var Earth = Util.extend({}, CRS, {
	wrapLng: [-180, 180],

	// Mean Earth Radius, as recommended for use by
	// the International Union of Geodesy and Geophysics,
	// see http://rosettacode.org/wiki/Haversine_formula
	R: 6371000,

	// distance between two geographical points using spherical law of cosines approximation
	distance: function (latlng1, latlng2) {
		var rad = Math.PI / 180,
		    lat1 = latlng1.lat * rad,
		    lat2 = latlng2.lat * rad,
		    sinDLat = Math.sin((latlng2.lat - latlng1.lat) * rad / 2),
		    sinDLon = Math.sin((latlng2.lng - latlng1.lng) * rad / 2),
		    a = sinDLat * sinDLat + Math.cos(lat1) * Math.cos(lat2) * sinDLon * sinDLon,
		    c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
		return this.R * c;
	}
});