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/**
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* Created by Wandergis on 2015/7/8.
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* 提供了百度坐标(BD09)、国测局坐标(火星坐标,GCJ02)、和WGS84坐标系之间的转换
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*/
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//UMD魔法代码
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// if the module has no dependencies, the above pattern can be simplified to
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define([], factory);
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} else if (typeof module === 'object' && module.exports) {
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// Node. Does not work with strict CommonJS, but
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// only CommonJS-like environments that support module.exports,
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// like Node.
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module.exports = factory();
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} else {
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// Browser globals (root is window)
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root.coordtransform = factory();
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}
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}(this, function () {
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//定义一些常量
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var x_PI = 3.14159265358979324 * 3000.0 / 180.0;
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var PI = 3.1415926535897932384626;
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var a = 6378245.0;
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var ee = 0.00669342162296594323;
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/**
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* 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换
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* 即 百度 转 谷歌、高德
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* @param bd_lon
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* @param bd_lat
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* @returns {*[]}
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*/
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var bd09togcj02 = function bd09togcj02(bd_lon, bd_lat) {
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var bd_lon = +bd_lon;
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var bd_lat = +bd_lat;
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var x = bd_lon - 0.0065;
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var y = bd_lat - 0.006;
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var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_PI);
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var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_PI);
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var gg_lng = z * Math.cos(theta);
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var gg_lat = z * Math.sin(theta);
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return [gg_lng, gg_lat]
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};
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/**
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* 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换
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* 即谷歌、高德 转 百度
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* @param lng
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* @param lat
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* @returns {*[]}
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*/
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var gcj02tobd09 = function gcj02tobd09(lng, lat) {
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var lat = +lat;
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var lng = +lng;
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var z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_PI);
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var theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_PI);
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var bd_lng = z * Math.cos(theta) + 0.0065;
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var bd_lat = z * Math.sin(theta) + 0.006;
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return [bd_lng, bd_lat]
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};
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/**
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* WGS84转GCj02
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* @param lng
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* @param lat
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* @returns {*[]}
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*/
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var wgs84togcj02 = function wgs84togcj02(lng, lat) {
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var lat = +lat;
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var lng = +lng;
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if (out_of_china(lng, lat)) {
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return [lng, lat]
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} else {
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var dlat = transformlat(lng - 105.0, lat - 35.0);
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var dlng = transformlng(lng - 105.0, lat - 35.0);
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var radlat = lat / 180.0 * PI;
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var magic = Math.sin(radlat);
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magic = 1 - ee * magic * magic;
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var sqrtmagic = Math.sqrt(magic);
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dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
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var mglat = lat + dlat;
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var mglng = lng + dlng;
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return [mglng, mglat]
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}
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};
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/**
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* GCJ02 转换为 WGS84
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* @param lng
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* @param lat
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* @returns {*[]}
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*/
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var gcj02towgs84 = function gcj02towgs84(lng, lat) {
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var lat = +lat;
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var lng = +lng;
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if (out_of_china(lng, lat)) {
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return [lng, lat]
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} else {
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var dlat = transformlat(lng - 105.0, lat - 35.0);
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var dlng = transformlng(lng - 105.0, lat - 35.0);
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var radlat = lat / 180.0 * PI;
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var magic = Math.sin(radlat);
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magic = 1 - ee * magic * magic;
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var sqrtmagic = Math.sqrt(magic);
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dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
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var mglat = lat + dlat;
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var mglng = lng + dlng;
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return [lng * 2 - mglng, lat * 2 - mglat]
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}
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};
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var transformlat = function transformlat(lng, lat) {
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var lat = +lat;
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var lng = +lng;
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var ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;
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return ret
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};
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var transformlng = function transformlng(lng, lat) {
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var lat = +lat;
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var lng = +lng;
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var ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lng * PI) + 40.0 * Math.sin(lng / 3.0 * PI)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(lng / 12.0 * PI) + 300.0 * Math.sin(lng / 30.0 * PI)) * 2.0 / 3.0;
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return ret
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};
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/**
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* 判断是否在国内,不在国内则不做偏移
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* @param lng
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* @param lat
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* @returns {boolean}
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*/
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var out_of_china = function out_of_china(lng, lat) {
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var lat = +lat;
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var lng = +lng;
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// 纬度3.86~53.55,经度73.66~135.05
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return !(lng > 73.66 && lng < 135.05 && lat > 3.86 && lat < 53.55);
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};
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return {
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bd09togcj02: bd09togcj02,
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gcj02tobd09: gcj02tobd09,
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wgs84togcj02: wgs84togcj02,
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gcj02towgs84: gcj02towgs84
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}
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}));
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