/**
 * The earth's radius, in meters.
 * Mean radius as defined by IUGG.
 */
export declare const EARTH_RADIUS = 6371009;
/**
 * Restrict x to the range [low, high].
 */
export declare function clamp(x: number, low: number, high: number): number;
/**
 * Wraps the given value into the inclusive-exclusive interval between min and max.
 *
 * @param n The value to wrap.
 * @param min The minimum.
 * @param max The maximum.
 */
export declare function wrap(n: number, min: number, max: number): number;
/**
 * Returns the non-negative remainder of x / m.
 *
 * @param x The operand.
 * @param m The modulus.
 */
export declare function mod(x: number, m: number): number;
/**
 * Returns mercator Y corresponding to latitude.
 * See http://en.wikipedia.org/wiki/Mercator_projection .
 */
export declare function mercator(lat: number): number;
/**
 * Returns latitude from mercator Y.
 */
export declare function inverseMercator(y: number): number;
/**
 * Returns haversine(angle-in-radians).
 * hav(x) == (1 - cos(x)) / 2 == sin(x / 2)^2.
 */
export declare function hav(x: number): number;
/**
 * Computes inverse haversine. Has good numerical stability around 0.
 * arcHav(x) == acos(1 - 2 * x) == 2 * asin(sqrt(x)).
 * The argument must be in [0, 1], and the result is positive.
 */
export declare function arcHav(x: number): number;
export declare function sinFromHav(h: number): number;
export declare function havFromSin(x: number): number;
export declare function sinSumFromHav(x: number, y: number): number;
/**
 * Returns hav() of distance from (lat1, lng1) to (lat2, lng2) on the unit sphere.
 */
export declare function havDistance(lat1: number, lat2: number, dLng: number): number;
/**
 * Converts degrees to radians.
 */
export declare function toRadians(degrees: number): number;
/**
 * Converts radians to degrees.
 */
export declare function toDegrees(radians: number): number;
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