BUG: setup OSSIMDEMHandler in stereo classes

Modules/Applications/AppStereo/app/otbStereoRectificationGridGenerator.cxx

@@ -312,6 +312,7 @@ private:
       m_StatisticsFilter->Update();
 
       otb::DEMHandler::Instance()->SetDefaultHeightAboveEllipsoid(m_StatisticsFilter->GetMean());
+      otb::OssimDEMHandler::Instance()->SetDefaultHeightAboveEllipsoid(m_StatisticsFilter->GetMean());
 
       EnableParameter("epi.elevation.avgdem.value");
       SetParameterFloat("epi.elevation.avgdem.value", m_StatisticsFilter->GetMean());

Modules/Registration/Stereo/test/otbStereorectificationDisplacementFieldSource.cxx

@@ -56,6 +56,7 @@ int otbStereorectificationDisplacementFieldSource(int itkNotUsed(argc), char* ar
   dfSource->SetScale(scale);
 
   otb::DEMHandler::Instance()->SetDefaultHeightAboveEllipsoid(avgElev);
+  otb::OssimDEMHandler::Instance()->SetDefaultHeightAboveEllipsoid(avgElev);
 
   WriterType::Pointer writer1 = WriterType::New();
   writer1->SetInput(dfSource->GetLeftDisplacementFieldOutput());