gps坐标转成火星坐标

  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;
            }
          };