/** A projected point in viewBox units, y growing DOWN the way SVG measures it. */
export interface GeoPoint {
    x: number;
    y: number;
}
/**
 * Width / height of the projected world. A viewBox in this ratio shows the map
 * undistorted; any other ratio stretches it, since the projection fills whatever
 * box it is handed.
 */
export declare const NATURAL_EARTH_ASPECT: number;
/** The undistorted height for a given map width, i.e. `width / NATURAL_EARTH_ASPECT`. */
export declare function naturalEarthHeight(width: number): number;
/**
 * Project a geographic coordinate into a `width` x `height` viewBox.
 *
 * `longitude` and `latitude` are DEGREES (longitude east-positive, latitude
 * north-positive). The result is in viewBox units with the origin at the top
 * left: 0°/0° lands at the exact center, the antimeridian at x = 0 and
 * x = width, and the poles at y = 0 (north) and y = height (south).
 */
export declare function projectNaturalEarth(longitude: number, latitude: number, width: number, height: number): GeoPoint;
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