JS algorithm to convert GPS international coordinates into High German Mars coordinates __

German API coordinate conversion: http://lbs.amap.com/api/webservice/guide/api/convert/ Algorithm Advantages

The German API has its own coordinate conversion method, each conversion requires a request, the efficiency is too low. Using this algorithm, you will have unexpected performance improvements when you need to bulk convert GPS international coordinates into a German Mars coordinate. How to use

Gps.gcj_encrypt ("Latitude", "longitude"); function returns the converted German coordinates

Code Implementation

var GPS = {pi:3.14159265358979324, x_pi:3.14159265358979324 * 3000.0/180.0, delta:function (lat, lon) {//Krasovsky 1940///A = 6378245.0, 1/f = 298.3//b = A * (1-f)//EE = (
        a^2-b^2)/a^2; var a = 6378245.0;
        A: The projection factor of the satellite ellipsoid coordinate projection to the plane map coordinate system. var ee = 0.00669342162296594323;
        EE: The eccentricity of the ellipsoid.
        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};
            //gps---Gould gcj_encrypt:function (Wgslat, Wgslon) {if (This.outofchina (Wgslat)) 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 * M
        Ath.sqrt (Math.Abs (x)); RET = (20.0 * Math.sin (6.0 * x *). 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) + 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.sqr
        T (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; }
};