/**
**
** @RDE_HEADER@
** Math const
** $Id$
** $HeadURL$
** $Author$
**
** -----------------------------------------------------------------------------------------------
**
** Hardware-Environment: Intel-PC
** Software-Environment: Windows 7, Qt 5.4. ArcGIS 10.2.5
**
** Language ........: C++ 11
**
** -----------------------------------------------------------------------------------------------
**
** Author ...........: Jörg Turla, SPD G, Tel. 3132
**
** -----------------------------------------------------------------------------------------------
**
** Notes .........:
**
**   04.12.2015, JT  : First edition
**
** -----------------------------------------------------------------------------------------------
*/

#pragma once

#include <cmath>

namespace MathConst
{

  constexpr double pi        = M_PI;
  constexpr double pi_two    = pi * 2;
  constexpr double pi_half   = M_PI_2;
  constexpr double pi_quater = M_PI_4;

  constexpr double EarthRadius   = 6371001.0;
  
  constexpr double WGS84_Major_a = 6378137.0;  // WGS84 Ellipsoid, a value (Radius am Äquator, große Halbachse)
  constexpr double WGS84_Minor_b = 6378137.0*( 1.0 - 1.0/298.257223563);
  constexpr double WGS84_SQR_EXC = ((WGS84_Major_a * WGS84_Major_a) - (WGS84_Minor_b * WGS84_Minor_b))/(WGS84_Major_a * WGS84_Major_a);

} // namespace MathConst