map = new AMap.Map('container', {
resizeEnable: true
});
map.plugin('AMap.Geolocation', function() {
geolocation = new AMap.Geolocation({
enableHighAccuracy: true,//是否使用高精度定位，默认:true
timeout: 10000, //超过10秒后停止定位，默认：无穷大
buttonOffset: new AMap.Pixel(10, 20),//定位按钮与设置的停靠位置的偏移量，默认：Pixel(10, 20)
zoomToAccuracy: true, //定位成功后调整地图视野范围使定位位置及精度范围视野内可见，默认：false
buttonPosition:'RB'
});
map.addControl(geolocation);
geolocation.getCurrentPosition();
AMap.event.addListener(geolocation, 'complete', onComplete);//返回定位信息
AMap.event.addListener(geolocation, 'error', onError); //返回定位出错信息
});
//解析定位结果
function onComplete(data) {
var EndLatitude = document.getElementById("EndLatitude").value;
var EndLongitude = document.getElementById("EndLongitude").value;
var str=['定位成功'];
str.push('经度：' + data.position.getLng());
str.push('纬度：' + data.position.getLat());
var gpsPoint = GPS.gcj_encrypt(data.position.getLat(), data.position.getLng());
lng= gpsPoint.lon;
lat= gpsPoint.lat;
if(data.accuracy){
str.push('精度：' + data.accuracy + ' 米');
}//如为IP精确定位结果则没有精度信息
str.push('是否经过偏移：' + (data.isConverted ? '是' : '否'));
//var a = "http://api.map.baidu.com/direction?origin=latlng:" + position.coords.latitude + "," + position.coords.longitude + "|name:我的位置&destination=latlng:" + EndLatitude + "," + EndLongitude + "|name:目的地&mode=driving®ion=成都&output=html&src=scnjw";
//var a = "http://api.map.baidu.com/direction?origin=latlng:31.64380,105.00065|name:去嘛&destination=latlng:30.64380,104.00065|name:来嘛&mode=driving®ion=成都&output=html&src=scnjw";
// var a = "http://uri.amap.com/navigation?from=" + position.coords.longitude + "," + position.coords.latitude + ",我的位置&to=" + EndLongitude + "," + EndLatitude + ",目的地&mode=car&policy=1&src=mypage&coordinate=gaode&callnative=0";
var a = "http://uri.amap.com/navigation?from=" +lng+","+lat + ",我的位置&to=" + EndLongitude + "," + EndLatitude + ",目的地&mode=car&policy=1&src=mypage&coordinate=gaode&callnative=0";
top.location = a;
}
//解析定位错误信息
function onError(data) {
document.getElementById('tip').innerHTML = '定位失败';
}
var GPS = {
PI: 3.14159265358979324,
x_pi: 3.14159265358979324 * 3000.0 / 180.0,
delta: function (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 = this.transformLat(lon - 105.0, lat - 35.0);
var dLon = this.transformLon(lon - 105.0, lat - 35.0);
var radLat = lat / 180.0 * this.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) * this.PI);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * this.PI);
return {
'lat': dLat,
'lon': dLon
};
},
//WGS-84 to GCJ-02
gcj_encrypt: function (wgsLat, wgsLon) {
if (this.outOfChina(wgsLat, wgsLon))
return {
'lat': wgsLat,
'lon': wgsLon
};
var d = this.delta(wgsLat, wgsLon);
return {
'lat': wgsLat + d.lat,
'lon': wgsLon + d.lon
};
},
outOfChina: function (lat, lon) {
if (lon < 72.004 || lon > 137.8347)
return true;
if (lat < 0.8293 || lat > 55.8271)
return true;
return false;
},
transformLat: function (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 * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(y * this.PI) + 40.0 * Math.sin(y / 3.0 * this.PI)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(y / 12.0 * this.PI) + 320 * Math.sin(y * this.PI / 30.0)) * 2.0 / 3.0;
return ret;
},
transformLon: function (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 * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(x * this.PI) + 40.0 * Math.sin(x / 3.0 * this.PI)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(x / 12.0 * this.PI) + 300.0 * Math.sin(x / 30.0 * this.PI)) * 2.0 / 3.0;
return ret;
}
};
位置偏差 转换
var result = gcoord.transform(
[104.059303, 30.542873], // 经纬度坐标
gcoord.WGS84, // 当前坐标系
gcoord.GCJ02 // 目标坐标系
);
console.log( result );
gcoord官网
https://github.com/hujiulong/gcoord