BUG : M_PI instead of M_1_PI into SARDeramp filter

include/otbSARDerampImageFilter.txx

@@ -42,12 +42,6 @@ using ossimplugins::time::microseconds;
 using ossimplugins::time::seconds;
 #endif
 
-#ifndef M_1_PI
-#define M_1_PI 0.31830988618379067154
-#endif
-
-
-
 namespace otb
 {
   /** 
@@ -308,7 +302,7 @@ namespace otb
 	// Get some metadata
 	double aziSteeringRate = std::stod(inputKWL.GetMetadataByKey("support_data.azimuth_steering_rate"));
 	// Conversion to radians per seconds
-	aziSteeringRate *= (M_1_PI/180); 
+	aziSteeringRate *= (M_PI/180); 
 
 	m_FirstAziTime = ossimplugins::time::toModifiedJulianDate((inputKWL.GetMetadataByKey("support_data.first_line_time")));
 	m_FirstRangeTime = std::stod(inputKWL.GetMetadataByKey("support_data.slant_range_to_first_pixel"));
@@ -398,7 +392,7 @@ namespace otb
 	    double Kt = (this->applyFMRateCoefs(index[0]) * m_Ks) / (this->applyFMRateCoefs(index[0]) - m_Ks);
 
 	    // Phi
-	    double Phi = - M_1_PI * Kt * (aziTime -refTime)*(aziTime -refTime);
+	    double Phi = - M_PI * Kt * (aziTime -refTime)*(aziTime -refTime);
 
 	    // Deramping or Reramping 
 	    if (!m_DerampMode)