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Lts/Viewer/SituationMap/MathUtils/math_const.h

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+/**
+**
+** @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