如何将Javascript中的地理坐标转换为C#中的地理坐标

Question

我有一些javascript代码,我想将其转换为C#.我不知道构造它的最佳方法,或者是否有一种简单的方法来转换代码.

此代码的示例如下所示.

// ellipse parameters
var e = { WGS84:    { a: 6378137,     b: 6356752.3142, f: 1/298.257223563 },
          Airy1830: { a: 6377563.396, b: 6356256.910,  f: 1/299.3249646   },
          Airy1849: { a: 6377340.189, b: 6356034.447,  f: 1/299.3249646   } };

// helmert transform parameters
var h = { WGS84toOSGB36: { tx: -446.448,  ty:  125.157,   tz: -542.060,   // m
                           rx:   -0.1502, ry:   -0.2470,  rz:   -0.8421,  // sec
                           s:    20.4894 },                               // ppm
          OSGB36toWGS84: { tx:  446.448,  ty: -125.157,   tz:  542.060,
                           rx:    0.1502, ry:    0.2470,  rz:    0.8421,
                           s:   -20.4894 } };


function convertOSGB36toWGS84(p1) {
  var p2 = convert(p1, e.Airy1830, h.OSGB36toWGS84, e.WGS84);
  return p2;
}

完整代码可以从以下网址下载: Javascript网格代码

编辑:谢谢大家的帮助; 我想第二个要求是可以转换链接中代码的提醒.该片段的重点是匿名类型.

Answer 1

您的JavaScript代码段正在创建匿名类型.您可以在C#中执行相同的操作:

var e = new
{
    WGS84 = new { a = 6378137, b = 6356752.3142, f = 1 / 298.257223563 },
    Airy1830 = new { a = 6377563.396, b = 6356256.910, f = 1 / 299.3249646 },
    Airy1849 = new { a = 6377340.189, b = 6356034.447, f = 1 / 299.3249646 }
};

var h = new
{
    WGS84toOSGB36 = new
    {
        tx = -446.448, ty = 125.157, tz = -542.060, // m
        rx = -0.1502, ry = -0.2470, rz = -0.8421,   // sec
        s = 20.4894                                 // ppm
    },                               
    OSGB36toWGS84 = new
    {
        tx = 446.448,
        ty = -125.157,
        tz = 542.060,
        rx = 0.1502,
        ry = 0.2470,
        rz = 0.8421,
        s = -20.4894
    }
};

Answer 2

JavaScript使用匿名类型.您可以在C#中执行相同操作,但使用命名类型会更清楚.

例如,像这样的JavaScript:

// ellipse parameters
var e = { WGS84:    { a: 6378137,     b: 6356752.3142, f: 1/298.257223563 },
          Airy1830: { a: 6377563.396, b: 6356256.910,  f: 1/299.3249646   },
          Airy1849: { a: 6377340.189, b: 6356034.447,  f: 1/299.3249646   } };

..代表省略号.您可以在C#中执行此操作,如下所示:

// ellipse class
public class EllipseParameters {
    public double a {get; set;} 
    public double b {get; set;} 
    public double f {get; set;}
}

public Ellipses { 
    public EllipseParameters WGS84 {get;set;}
    public EllipseParameters Airy1830 {get;set;}
    public EllipseParameters Airy1849 {get;set;}
}

Ellipses e = new Ellipses {
    WGS84 = new EllipseParameters { a = 6378137,     b= 6356752.3142, f = 1/298.257223563 },
    Airy1830 = new EllipseParameters { a= 6377563.396, b= 6356256.910,  f= 1/299.3249646   },
    Airy1849 = new EllipseParameters { a= 6377340.189, b= 6356034.447,  f= 1/299.3249646   }
};

但是代替Ellipses类,您可能需要一个字典方法,如下所示:

var e = new Dictionary<String,EllipseParameters>();
e.Add("WGS84", new EllipseParameters { a = 6378137,     b= 6356752.3142, f = 1/298.257223563 });
e.Add("Airy1830", new EllipseParameters { a= 6377563.396, b= 6356256.910,  f= 1/299.3249646   });
e.Add("Airy1849", new EllipseParameters { a= 6377340.189, b= 6356034.447,  f= 1/299.3249646   });

您将使用与helmert转换类相同的方法.

Answer 3

我工作的公司刚刚开源了一个库来做到这一点： http: //code.google.com/p/geocoordconversion/