import { ProjectionBase } from '.';
import type { VectorPoint } from '../../geometry';
import type { ProjectionParams, ProjectionTransform } from '.';
/**
 * # Stereographic
 *
 * **Classification**: Azimuthal
 *
 * **Available forms**: Forward and inverse, spherical and ellipsoidal
 *
 * **Defined area**: Global
 *
 * **Alias**: stere
 *
 * **Domain**: 2D
 *
 * **Input type**: Geodetic coordinates
 *
 * **Output type**: Projected coordinates
 *
 * ## Projection String
 * ```
 * +proj=stere +lat_0=90 +latTs=75
 * ```
 *
 * Note:
 * This projection method gives different results than the :ref:`sterea`
 * method in the non-polar cases (i.e. the oblique and equatorial case). The later
 * projection method is the one referenced by EPSG as "Oblique Stereographic".
 *
 * ## Required Parameters
 * - None
 *
 * ## Optional Parameters
 * - `+lat_0=<value>`: Latitude of origin.
 * - `+latTs=<value>`: Latitude where scale is not distorted.
 * - `+k_0=<value>`: Scale factor.
 * - `+lon_0=<value>`: Central meridian.
 * - `+ellps=<value>`: Ellipsoid used.
 * - `+R=<value>`: Radius of the projection sphere.
 * - `+x_0=<value>`: False easting.
 * - `+y_0=<value>`: False northing.
 *
 * ![Stereographic](https://github.com/Open-S2/s2-tools/blob/master/assets/proj4/projections/images/stere.png?raw=true)
 */
export declare class StereographicSouthPole extends ProjectionBase implements ProjectionTransform {
    #private;
    name: string;
    static names: string[];
    coslat0: number;
    sinlat0: number;
    con: number;
    cons: number;
    ms1: number;
    X0: number;
    cosX0: number;
    sinX0: number;
    /**
     * Preps an StereographicSouthPole projection
     * @param params - projection specific parameters
     */
    constructor(params?: ProjectionParams);
    /**
     * StereographicSouthPole forward equations--mapping lon-lat to x-y
     * @param p - lon-lat WGS84 point
     */
    forward(p: VectorPoint): void;
    /**
     * StereographicSouthPole inverse equations--mapping x-y to lon-lat
     * @param p - StereographicSouthPole point
     */
    inverse(p: VectorPoint): void;
}
//# sourceMappingURL=stere.d.ts.map