import { Location } from './types';
export declare enum Unit {
    English = 0,
    Metric = 1
}
/**
 * Speed between two points
 */
declare function speed(p1: number[], p2: number[]): number;
declare function duration(line: number[][]): number;
/**
 * Distance between geographic points accounting for earth curvature
 * South latitudes are negative, east longitudes are positive
 *
 * @see http://stackoverflow.com/questions/3694380/calculating-distance-between-two-points-using-latitude-longitude-what-am-i-doi
 * @see http://www.geodatasource.com/developers/javascript
 * @see http://www.movable-type.co.uk/scripts/latlong.html
 * @see http://boulter.com/gps/distance/
 *
 *    Given φ is latitude radians, λ is longitude radians, R is earth radius:
 *    a = sin²(Δφ/2) + cos φ1 ⋅ cos φ2 ⋅ sin²(Δλ/2)
 *    c = 2 ⋅ atan2(√a, √(1−a))
 *    d = R ⋅ c
 */
declare function pointDistance(p1: number[] | undefined, p2: number[] | undefined): number;
/**
 * Find center of coordinates. Points are ordered as longitude, latitude.
 *
 * @see http://stackoverflow.com/questions/6671183/calculate-the-center-point-of-multiple-latitude-longitude-coordinate-pairs
 */
declare function centroid(points: number[][]): Location | null;
/**
 * Simplification using Douglas-Peucker algorithm with recursion elimination
 */
declare function simplify(points: number[][], maxPointDeviationFeet?: number): number[][];
export declare const measure: {
    speed: typeof speed;
    length: (points: number[][]) => number;
    centroid: typeof centroid;
    duration: typeof duration;
    toRadians: (deg: number) => number;
    sameLocation: (p1: number[] | undefined, p2: number[] | undefined) => boolean;
    pointDistance: typeof pointDistance;
    simplify: typeof simplify;
};
export {};