Index: trunk/SDToolBox/extract_data.py
===================================================================
diff -u -r196 -r197
--- trunk/SDToolBox/extract_data.py	(.../extract_data.py)	(revision 196)
+++ trunk/SDToolBox/extract_data.py	(.../extract_data.py)	(revision 197)
@@ -417,7 +417,7 @@
                     return self.get_masked_nn_lat_lon(
                         input_data=input_data,
                         ref_dataset=ref_dataset,
-                        mask_dir=os.path.dirname(os.path.dirname(ref_file_path)),
+                        mask_dir=ref_file_path.parent.parent,
                     )
 
         def _get_filtered_dict(
@@ -561,7 +561,7 @@
                     np.ix_(sorted(indexes[0]), sorted(indexes[1]))
                 ]
                 logging.info("Added sea mask to input_data.")
-                return nn_idx, (unique_values[:, 1], unique_values[:, 0])
+            return nn_idx, (unique_values[:, 1], unique_values[:, 0])
 
         @staticmethod
         def __get_case_subset(