/**
 * Returns the distances between two latitude/longitude points in meters.
 *
 * Algorithm adapted from:
 * https://stackoverflow.com/questions/639695/how-to-convert-latitude-or-longitude-to-meters
 *
 * @param lat1 Latitude of point 1.
 * @param lon1 Longitude of point 1.
 * @param lat2 Latitude of point 2.
 * @param lon2 Longitude of point 2.
 */
export declare function distanceInMeters(lat1: number, lon1: number, lat2: number, lon2: number): number;