// 百度转高德：
var point = bd09_To_Gcj02(36.950656, 114.556607)
// 百度转gps：
var point = bd09_To_Gps84(36.950656, 114.556607)
const PI = 3.14159265358979324;
const x_pi = 3.14159265358979324 * 3000.0 / 180.0;
const transformLat = (x, y) => {
var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(y * PI) + 40.0 * Math.sin(y / 3.0 * PI)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(y / 12.0 * PI) + 320 * Math.sin(y * PI / 30.0)) * 2.0 / 3.0;
return ret;
}
const transformLon = (x, y) => {
var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * PI) + 20.0 * Math.sin(2.0 * x * PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(x * PI) + 40.0 * Math.sin(x / 3.0 * PI)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(x / 12.0 * PI) + 300.0 * Math.sin(x / 30.0 * PI)) * 2.0 / 3.0;
return ret;
}
const delta = (lat, lon) => {
var a = 6378245.0; // a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
var ee = 0.00669342162296594323; // ee: 椭球的偏心率。
var dLat = transformLat(lon - 105.0, lat - 35.0);
var dLon = transformLon(lon - 105.0, lat - 35.0);
var radLat = lat / 180.0 * PI;
var magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
var sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * PI);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * PI);
return { 'lat': dLat, 'lon': dLon };
}
// 边界
const outOfChina = (lat, lon) => {
if (lon < 72.004 || lon > 137.8347)
return true;
if (lat < 0.8293 || lat > 55.8271)
return true;
return false;
}
// GPS转火星
const gps84_To_Gcj02 = (wgsLat, wgsLon) => {
if (outOfChina(wgsLat, wgsLon))
return { 'lat': wgsLat, 'lon': wgsLon };
var d = delta(wgsLat, wgsLon);
return { lat: wgsLat + d.lat, lon: wgsLon + d.lon };
}
// 火星转百度
const gcj02_To_Bd09 = (lat, lng) => {
let x_pi = 3.14159265358979324 * 3000.0 / 180.0;
let x = lng;
let y = lat;
let z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
let theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
let lngs = z * Math.cos(theta) + 0.0065;
let lats = z * Math.sin(theta) + 0.006;
return { lat: lats, lon: lngs };
}
// GPS转百度
const gps84_To_Bd09 = (wgsLat, wgsLon) => {
let point = gps84_To_Gcj02(wgsLat, wgsLon);
return gcj02_To_Bd09(point.lat, point.lon);
}
//百度坐标系 (BD-09) to 火星坐标系 (GCJ-02)
const bd09_To_Gcj02 = (lat, lng) => {
let x_pi = 3.14159265358979324 * 3000.0 / 180.0;
let x = lng - 0.0065;
let y = lat - 0.006;
let z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
let theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
let lngs = z * Math.cos(theta);
let lats = z * Math.sin(theta);
return { lat: lats, lon: lngs }
}
// 火星转GPS
const gcj02_to_gps84 = (lat, lng) => {
var lat = +lat;
var lng = +lng;
if (outOfChina(lat, lng)) {
return [lng, lat]
} else {
var dlat = transformLat(lng - 105.0, lat - 35.0);
var dlng = transformLon(lng - 105.0, lat - 35.0);
var radlat = lat / 180.0 * PI;
var magic = Math.sin(radlat);
magic = 1 - ee * magic * magic;
var sqrtmagic = Math.sqrt(magic);
dlat = (dlat * 180.0) / ((a * (1 - ee)) / (magic * sqrtmagic) * PI);
dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
var mglat = lat + dlat;
var mglng = lng + dlng;
return [lng * 2 - mglng, lat * 2 - mglat]
}
}
// 百度转GPS
const bd09_To_Gps84 = (wgsLat, wgsLon) => {
let point = bd09_To_Gcj02(wgsLat, wgsLon);
return gcj02_to_gps84(point.lat, point.lon);
}
const points = [
{ lon: 121.560788, lat: 38.961150 },
{ lon: 121.560790, lat: 38.961261 },
{ lon: 121.560793, lat: 38.961261 },
{ lon: 121.560793, lat: 38.961371 },
{ lon: 121.560796, lat: 38.961478 },
{ lon: 121.560798, lat: 38.961585 },
{ lon: 121.560801, lat: 38.961690 },
{ lon: 121.560805, lat: 38.961793 },
{ lon: 121.560805, lat: 38.961896 },
{ lon: 121.560806, lat: 38.961996 },
{ lon: 121.560808, lat: 38.962096 },
{ lon: 121.560808, lat: 38.962195 },
{ lon: 121.560808, lat: 38.962295 },
{ lon: 121.560808, lat: 38.962398 },
{ lon: 121.560808, lat: 38.962398 },
{ lon: 121.560810, lat: 38.962506 },
{ lon: 121.560811, lat: 38.962616 },
{ lon: 121.560813, lat: 38.962725 },
{ lon: 121.560811, lat: 38.962835 },
{ lon: 121.560810, lat: 38.962946 },
{ lon: 121.560808, lat: 38.963058 },
{ lon: 121.560805, lat: 38.963165 },
{ lon: 121.560803, lat: 38.963263 },
{ lon: 121.560801, lat: 38.963356 },
{ lon: 121.560798, lat: 38.963450 },
{ lon: 121.560790, lat: 38.963548 },
{ lon: 121.560790, lat: 38.963548 },
]
const toBdPoints = points.map(item => gps84_To_Bd09(item.lat, item.lon));
console.log('toBdPoints', toBdPoints)
const res = [
{ lat: 38.968321708732375, lng: 121.57214992426073 },
{ lat: 38.9684327472048, lng: 121.57215189069511 },
{ lat: 38.968432725337095, lng: 121.57215488938073 },
{ lat: 38.968542778095575, lng: 121.57215485756942 },
{ lat: 38.96864980772118, lng: 121.57215782587157 },
{ lat: 38.96875684481405, lng: 121.57215979516326 },
{ lat: 38.96886187381503, lng: 121.57216276511572 },
{ lat: 38.968964894706346, lng: 121.57216673570298 },
{ lat: 38.9690679449645, lng: 121.57216670854025 },
{ lat: 38.96916798661763, lng: 121.57216768222814 },
{ lat: 38.96926802112479, lng: 121.5721696559703 },
{ lat: 38.96936706990443, lng: 121.5721696313118 },
{ lat: 38.96946711933547, lng: 121.57216960689013 },
{ lat: 38.96957017041648, lng: 121.5721695822474 },
{ lat: 38.96957017041648, lng: 121.5721695822474 },
{ lat: 38.96967820954893, lng: 121.57217155610324 },
{ lat: 38.96978825717287, lng: 121.57217253051249 },
{ lat: 38.96989729717981, lng: 121.57217450530774 },
{ lat: 38.9700073671142, lng: 121.57217248219752 },
{ lat: 38.970118430439996, lng: 121.57217145904532 },
{ lat: 38.97023050177641, lng: 121.57216943673174 },
{ lat: 38.970337578068865, lng: 121.572166416469 },
{ lat: 38.97043564264245, lng: 121.57216439808819 },
{ lat: 38.97052870480721, lng: 121.5721623811332 },
{ lat: 38.970622774918816, lng: 121.5721593648621 },
{ lat: 38.97072088367989, lng: 121.57215135050546 },
{ lat: 38.97072088367989, lng: 121.57215135050546 }
]