正向转换
<html>
<body>
<script>
//墨卡托转 经纬度
function mercatorTolonlat(mercator){
var lonlat={x:0,y:0};
var x = mercator.x/20037508.34*180;
var y = mercator.y/20037508.34*180;
y= 180/Math.PI*(2*Math.atan(Math.exp(y*Math.PI/180))-Math.PI/2);
lonlat.x = x;
lonlat.y = y;
return lonlat;
}
//---------- 地球坐标系WGS84转火星坐标系GCJ02 start--------------//
var pi = 3.14159265358979324;
var a = 6378245.0;
var ee = 0.00669342162296594323;
/*判断是否在国内,不在国内则不做偏移*/
function outOfChina(lon, lat)
{
if ((lon < 72.004 || lon > 137.8347)&&(lat < 0.8293 || lat > 55.8271)){
return true;
}else {
return false;
}
}
function 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;
}
function 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;
}
function transform(point)
{
var wgLon = point.x;
var wgLat = point.y;
var mars_point={lon:0,lat:0};
if (outOfChina(wgLon,wgLat))
{
mars_point.lat = wgLat;
mars_point.lon = wgLon;
return;
}
var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
var radLat = wgLat / 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);
mars_point.x = wgLon + dLon;
mars_point.y = wgLat + dLat;
return mars_point
}
//---------- 地球坐标系WGS84转火星坐标系GCJ02 end--------------//
// ------- WGS84_UTM 转 GCJ02 坐标系 start-----------------------//
function wgs84utmToGCJ02(){
var retransformX = document.getElementById("retransformX");
var retransformY = document.getElementById("retransformY");
var transformX = document.getElementById("transformX");
var transformY = document.getElementById("transformY");
debugger;
var point = {
x:Number(retransformX.value),
y:Number(retransformY.value)
}
var point1 = mercatorTolonlat(point);
var mars_point = transform(point1);
//alert("2----------- "+mars_point.x+" ---------- "+mars_point.y);
transformX.value = mars_point.x;
transformY.value = mars_point.y;
return mars_point;
}
// ------- WGS84-UTM 转 GCJ02 坐标系 end-----------------------//
//wgs84utmToGCJ02();
</script>
转换前X:<input type="text" id="retransformX" value="12125072.03207834"/></br>
转换前Y:<input type="text" id="retransformY" value="4059163.738375962"/> </br>
------------------------- <button type="button" onclick="wgs84utmToGCJ02()">WGS84_UTM转换GCJ02</button>----------------------- </br>
转换后X:<input type="text" id="transformX"/></br>
转换后Y:<input type="text" id="transformY"/>
</body>
</html>
逆向转换
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
转换前X:<input type="text" id="retransformX" value="12125072.03207834"/></br>
转换前Y:<input type="text" id="retransformY" value="4059163.738375962"/> </br>
------------------------- <button type="button" onclick="wgs84utmToGCJ02()">WGS84_UTM转换GCJ02</button>----------------------- </br>
转换后X:<input type="text" id="transformX"/></br>
转换后Y:<input type="text" id="transformY"/>
</body>
<script>
var x_PI = 3.14159265358979324 * 3000.0 / 180.0;
var PI = 3.1415926535897932384626;
var a = 6378245.0;
var ee = 0.00669342162296594323;
function gcj02towgs84(lng, lat) {
var lat = +lat;
var lng = +lng;
if (out_of_china(lng, lat)) {
return [lng, lat]
} else {
var dlat = transformlat(lng - 105.0, lat - 35.0);
var dlng = transformlng(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]
}
};
function out_of_china(lng, lat) {
var lat = +lat;
var lng = +lng;
// 纬度3.86~53.55,经度73.66~135.05
return !(lng > 73.66 && lng < 135.05 && lat > 3.86 && lat < 53.55);
};
function transformlat(lng, lat) {
var lat = +lat;
var lng = +lng;
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));
ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;
return ret
};
function transformlng(lng, lat) {
var lat = +lat;
var lng = +lng;
var ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(lng * PI) + 40.0 * Math.sin(lng / 3.0 * PI)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(lng / 12.0 * PI) + 300.0 * Math.sin(lng / 30.0 * PI)) * 2.0 / 3.0;
return ret
};
function latLng2WebMercator(lng, lat) {
var earthRad = 6378137.0;
var x = lng * Math.PI / 180 * earthRad;
var a = lat * Math.PI / 180;
var y = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
return [x, y]; //[12727039.383734727, 3579066.6894065146]
}
function wgs84utmToGCJ02(){
var retransformX = document.getElementById("retransformX");
var retransformY = document.getElementById("retransformY");
var transformX = document.getElementById("transformX");
var transformY = document.getElementById("transformY");
var g84 = gcj02towgs84(Number(retransformX.value),Number(retransformY.value))
var mer = latLng2WebMercator(g84[0],g84[1])
transformX.value = mer[0];
transformY.value = mer[1];
}
</script>
</html>