using System;

using CoordinateSharp;                  

​

public class Program

{

    public static void Main()

    {

        GlobalSettings.Default_CoordinateFormatOptions = new CoordinateFormatOptions() 

        { Format = CoordinateFormatType.Decimal  };

        //KM ECEF (correct)

        Coordinate c = Coordinate.Parse("1231.2564091099831 -4800.45389645644844978 4000.024663498499", CartesianType.ECEF);

        Console.WriteLine(c.ToString() + " - " + c.ECEF.GeoDetic_Height.Meters);

        Console.WriteLine();

        //M ECEF (Incorrect)

        c = Coordinate.Parse("1231256.4091099831 -4800453.89645644844978 4000024.663498499", CartesianType.ECEF);

        Console.WriteLine(c.ToString()+ " - " + c.ECEF.GeoDetic_Height.Meters); 

    }

}