COMP: added retro compatibility for gdal 2

Modules/Adapters/GdalAdapters/include/otbSpatialReference.h

@@ -151,8 +151,13 @@ public:
    */
   unsigned int ToEPSG() const;
 
+#if GDAL_VERSION_NUM >= 3000000
+  /** Set the Axis mapping strategy
+   * proxy to the eponym ogr spatial reference method
+   * \param strategy Axis mapping stategy
+   */
   void SetAxisMappingStrategy(OSRAxisMappingStrategy strategy);
-
+#endif
 
   /**
    * Find which UTM zone a given (lat,lon) point falls in.

Modules/Adapters/GdalAdapters/src/otbSpatialReference.cxx

@@ -292,11 +292,11 @@ void SpatialReference::UTMFromGeoPoint(double lon, double lat, unsigned int & zo
   assert(zone<=60);
 }
 
-
+#if GDAL_VERSION_NUM >= 3000000
 void SpatialReference::SetAxisMappingStrategy(OSRAxisMappingStrategy strategy)
 {
   m_SR.get()->SetAxisMappingStrategy(strategy);
 };
-
+#endif
 
 }

Modules/Core/Transform/include/otbGenericMapProjection.hxx

@@ -70,8 +70,10 @@ GenericMapProjection<TDirectionOfMapping, TScalarType, NInputDimensions, NOutput
   SpatialReference wgs84 = SpatialReference::FromWGS84();
   SpatialReference wktSpatialReference = SpatialReference::FromDescription(projectionRefWkt);
 
+#if GDAL_VERSION_NUM >= 3000000
   wgs84.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
   wktSpatialReference.SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
+#endif
   
   if(DirectionOfMapping == TransformDirection::INVERSE)
     {

Modules/Learning/Sampling/include/otbImageSampleExtractorFilter.hxx

@@ -128,8 +128,16 @@ PersistentImageSampleExtractorFilter<TInputImage>
   if(projectionInformationAvailable)
     {
     OGRSpatialReference imgSRS;
+    
+    #if GDAL_VERSION_NUM >= 3000000 // importFromWkt is const-correct in GDAL 3
     const char *projWktCstr = projectionRefWkt.c_str();
-    OGRErr err = imgSRS.importFromWkt( projWktCstr );
+    OGRErr err = imgSRS.importFromWkt( &projWktCstr );
+    #else
+    const char *projWktCstr = projectionRefWkt.c_str();
+    char **projWktPointer = const_cast<char**>(&projWktCstr);
+    OGRErr err = imgSRS.importFromWkt( projWktPointer );
+    #endif
+    
     if (err == OGRERR_NONE)
       {
       // get input layer

Modules/Registration/Stereo/include/otbMulti3DMapToDEMFilter.hxx

@@ -335,7 +335,11 @@ void Multi3DMapToDEMFilter<T3DImage, TMaskImage, TOutputDEMImage>::GenerateOutpu
   if (!m_ProjectionRef.empty())
     {
     OGRSpatialReference oSRS;
+    #if GDAL_VERSION_NUM >= 3000000 // importFromWkt is const-correct in GDAL 3
     const char *wkt = m_ProjectionRef.c_str();
+    #else
+    char *wkt = const_cast<char *> (m_ProjectionRef.c_str());
+    #endif
     oSRS.importFromWkt(&wkt);
     m_IsGeographic = oSRS.IsGeographic(); // TODO check if this test is valid for all projection systems
     }