/**
 * BD09 Coordinate Reference System.
 * This crs is applied to web map and apps of baidu co.
 * It is secondly encrypted crs based on GCJ02 crs.
 *
 * @Author: wkgreat
 * @Date: 2020/08/08
 * */
/**
 * the code of bd09
 * @const
 * @type {string}
 * */
import { Extent } from 'ol/extent';
import Projection from 'ol/proj/Projection';
export declare const CODE = "BD09";
/**
 * radius of WGS84 ellipsoid
 * @const
 * @type {number}
 * */
export declare const RADIUS: number;
/**
 * extent of gcj02
 * @const
 * @type {ol/Extent}
 * */
export declare const EXTENT: Extent;
/**
 * coefficient between degree and radian
 * @const
 * @type {number}
 * */
export declare const METERS_PER_UNIT: number;
/**
 * the class of bd09 (baidu) coordinate reference system
 * @class BD09Projection
 * */
declare class BD09Projection extends Projection {
    constructor(code: string, opt_axisOrientation?: string);
}
/**
 * all codes of bd09 reference system
 * @const
 * @type {BD09Projection[]}
 * */
export declare const PROJECTIONS: BD09Projection[];
/**
 * transform coordinate from BD09 to gcj02
 * @function
 * @param {number[]} input input coordinate
 * @param {number[]} opt_output output coordinate
 * @param {number} opt_dimension dimension of coordinate
 * @return {number[]} tranformed coordinate
 * */
export declare function toGCJ02(input: number[], opt_output: number[], opt_dimension: number): number[];
/**
 * transform coordinate from GCJ02 to BD09
 * @function
 * @param {number[]} input input coordinate
 * @param {number[]} opt_output output coordinate
 * @param {number} opt_dimension dimension of coordinate
 * @return {number[]} tranformed coordinate
 * */
export declare function fromGcj02(input: number[], opt_output: number[], opt_dimension: number): number[];
export {};