BUG: #1507: rework the priority order in metadata loading

Modules/Adapters/OSSIMAdapters/src/otbImageKeywordlist.cxx

@@ -287,60 +287,15 @@ ReadGeometryFromImage(const std::string& filename, bool checkRpcTag)
     }
 
   /**********************************************************/
-  /* Third try : look for external geom file and RPC tags   */
+  /* Third try : look for RPC tags   */
   /**********************************************************/
-  if (!hasMetaData)
+  if (!hasMetaData && checkRpcTag)
     {
-    // If still no metadata, try the ".geom" file
-    ossimFilename ossimGeomFile = ossimFilename(filename).setExtension(".geom");
-    otb_kwl = ReadGeometryFromGEOMFile(ossimGeomFile);
-
-    // also check any RPC tags
-    ImageKeywordlist rpc_kwl;
-    if (checkRpcTag)
-      {
-      rpc_kwl = ReadGeometryFromRPCTag(filename);
-      }
-
-    if (otb_kwl.HasKey("type"))
-      {
-      // external geom has a "type" keyword
-      std::string geomType(otb_kwl.GetMetadataByKey("type"));
-      ossimProjection *testProj = ossimProjectionFactoryRegistry::instance()
-        ->createProjection(ossimString(geomType));
-      if (dynamic_cast<ossimSensorModel*>(testProj))
-        {
-        // "type" keyword corresponds to a sensor model : don't erase it
-        if (rpc_kwl.GetSize() > 0)
-          {
-          rpc_kwl.ClearMetadataByKey("type");
-          }
-
-        ossimKeywordlist ossim_test_kwl;
-        otb_kwl.convertToOSSIMKeywordlist(ossim_test_kwl);
-        testProj = ossimProjectionFactoryRegistry::instance()
-          ->createProjection(ossim_test_kwl);
-        if (testProj)
-          {
-          // external geom contains a valid sensor geometry
-          hasMetaData = true;
-          }
-        }
-      }
+    // check any RPC tags
+    otb_kwl = ReadGeometryFromRPCTag(filename);
 
-    // copy keywords found in RPC tags if the external geom is not valid
-    if (!hasMetaData && rpc_kwl.GetSize() > 0)
+    if (!otb_kwl.Empty())
       {
-      const ImageKeywordlist::KeywordlistMap &kwlMap = rpc_kwl.GetKeywordlist();
-      for (ImageKeywordlist::KeywordlistMap::const_iterator it = kwlMap.begin();
-          it != kwlMap.end();
-          ++it)
-        {
-        if (it->second != "")
-          {
-          otb_kwl.AddKey(it->first , it->second);
-          }
-        }
       hasMetaData = true;
       }
     }

Modules/IO/ImageIO/include/otbImageFileReader.txx

@@ -398,18 +398,33 @@ ImageFileReader<TOutputImage, ConvertPixelTraits>
     {
 
     std::string lFileNameOssimKeywordlist = GetDerivedDatasetSourceFileName(m_FileName);
+    std::string extension = itksys::SystemTools::GetFilenameLastExtension(lFileNameOssimKeywordlist);
+    std::string attachedGeom = lFileNameOssimKeywordlist.substr(
+      0,
+      lFileNameOssimKeywordlist.size() - extension.size()) + std::string(".geom");
 
     // Update otb Keywordlist
     ImageKeywordlist otb_kwl;
-    if (!m_FilenameHelper->ExtGEOMFileNameIsSet())
+
+    // Case 1: external geom supplied through extended filename
+    if (m_FilenameHelper->ExtGEOMFileNameIsSet())
       {
-      otb_kwl = ReadGeometryFromImage(lFileNameOssimKeywordlist,!m_FilenameHelper->GetSkipRpcTag());
-      otbMsgDevMacro(<< "Loading internal kwl");
+      otb_kwl = ReadGeometryFromGEOMFile(m_FilenameHelper->GetExtGEOMFileName());
+      otbMsgDevMacro(<< "Loading external kwl");
       }
+    // Case 2: attached geom (if present)
+    else if (itksys::SystemTools::FileExists(attachedGeom))
+      {
+      otb_kwl = ReadGeometryFromGEOMFile(attachedGeom);
+      otbMsgDevMacro(<< "Loading attached kwl");
+      }
+    // Case 3: find an ossimPluginProjection
+    // Case 4: find an ossimProjection
+    // Case 5: find RPC tags in TIF
     else
       {
-      otb_kwl = ReadGeometryFromGEOMFile(m_FilenameHelper->GetExtGEOMFileName());
-      otbMsgDevMacro(<< "Loading external kwl");
+      otb_kwl = ReadGeometryFromImage(lFileNameOssimKeywordlist,!m_FilenameHelper->GetSkipRpcTag());
+      otbMsgDevMacro(<< "Loading internal kwl");
       }
 
     // Don't add an empty ossim keyword list