ENH: Adding an accessor to the wkt string

Code/UtilitiesAdapters/OGRAdapters/otbOGRLayerWrapper.cxx

@@ -229,6 +229,26 @@ OGRSpatialReference const* otb::ogr::Layer::GetSpatialRef() const
   return m_Layer->GetSpatialRef();
 }
 
+std::string otb::ogr::Layer::GetProjectionRef() const
+{
+  char * wkt;
+  
+  const OGRErr res = m_Layer->GetSpatialRef()->exportToWkt(&wkt);
+
+  if(res !=  OGRERR_NONE)
+    {
+    itkGenericExceptionMacro(<< "Cannot convert spatial reference to wkt string for layer <"
+                              <<m_Layer->GetName()<<">: " << CPLGetLastErrorMsg());
+    }
+
+  std::string stringWkt(wkt);
+
+  // According to documentation, argument of exportToWkt() should be freed
+  OGRFree(wkt);
+
+  return stringWkt;
+}
+
 /*===========================================================================*/
 /*==========================[ Feature Definition ]===========================*/
 /*===========================================================================*/

Code/UtilitiesAdapters/OGRAdapters/otbOGRLayerWrapper.h

@@ -283,6 +283,11 @@ public:
    */
   OGRSpatialReference const* GetSpatialRef() const;
 
+  /** Returns the projection ref associated with the layer
+   * \return The projection ref (wkt string) associated with the layer
+   */
+  std::string GetProjectionRef() const;
+
   /**\name Iteration */
   //@{
   /**\ingroup gGeometry