RN中Geolocation的经纬度坐标转换为高德地图坐标

Geolocation经纬度转换为高德地图经纬度方法

直接调用如下GPS. gcj_encrypt(lat, lon)就行了

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: 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};
  },

  //GPS---高德
  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;
  }
}

这是我用iOS亲自测试过的，测试结果比较准确。谢谢您的阅读！