BUG: setup OssimDEMHandler in the case where DEMHandler is not called

include/otbSARDEMPolygonsAnalysisImageFilter.txx

@@ -33,6 +33,7 @@
 #include <cmath>
 #include <type_traits>
 
+#include "otbOssimDEMHandler.h"
 
 namespace otb
 {
@@ -43,6 +44,8 @@ namespace otb
   SARDEMPolygonsAnalysisImageFilter< TImageIn ,TImageOut, TImageDEM, TImageSAR, TFunction >::SARDEMPolygonsAnalysisImageFilter()
     : m_SarSensorModelAdapter(ITK_NULLPTR), m_Gain(100.), m_Margin(0), m_NoData(-32768), m_MLRan(1), m_MLAzi(1)
   {
+    // Setup Ossim, in case otb::DEMHandler singleton is not instanciated.
+    otb::OssimDEMHandler::Instance()->SetDefaultHeightAboveEllipsoid(0.0);
   }
   
   /**