export declare const EARTH_RADIUS_KM = 6371;
/**
 * Calculates arclength distance in km between coordinate pairs,
 * assuming the earth is a perfect sphere.
 *
 * @param lat1 - latitude coordinate(s) for first point(s) in decimal degrees
 * @param lon1 - longitude coordinate(s) for first point(s) in decimal degrees
 * @param lat2 - latitude coordinate(s) for second point(s) in decimal degrees
 * @param lon2 - longitude coordinate(s) for second point(s) in decimal degrees
 * @returns distance between coordinate pairs in km (scalar or array matching input dimensions)
 */
export declare function haversine(lat1: number | number[], lon1: number | number[], lat2: number | number[], lon2: number | number[]): number | number[];
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