ADD : helper for geo information conversions

Code/Projections/otbGeoInformationConversion.h

+/*=========================================================================
+
+  Program:   ORFEO Toolbox
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+
+  Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
+  See OTBCopyright.txt for details.
+
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+
+#ifndef __otbGeoInformationConversion_h
+#define __otbGeoInformationConversion_h
+
+#include "ogr_spatialref.h"
+
+namespace otb
+{
+
+/** \class GeoInformationConversion
+ *  \brief Helper to do the geo informations conversions used
+ *         frequently. 
+ *  
+ *  This class can help to build a WKT from a valid EPSG number using
+ *  the method ToWKT(int srid).
+ *           
+ * \sa 
+ */
+
+class GeoInformationConversion
+{
+public:
+  /** method used to create a wkt from an epsg number  */
+  static const char * ToWKT(int srid)
+  {
+    const char * wkt = NULL;
+    
+    // Build the srs from the epsg number
+    OGRSpatialReferenceH hSRS = NULL;
+    hSRS = OSRNewSpatialReference(NULL);
+    
+    if (OSRImportFromEPSG(hSRS,srid ) == OGRERR_NONE)
+      {
+      // Get the wkt 
+      if ( OSRExportToWkt(hSRS,(char**) &wkt) == OGRERR_NONE)
+        {
+        OSRDestroySpatialReference(hSRS);
+        }
+      }
+    return  wkt;
+  }
+
+protected:
+  /** Constructors */
+  GeoInformationConversion();
+
+  /** Destructor */
+  virtual ~GeoInformationConversion();
+};
+
+
+} // End namespace otb
+
+#endif