Index: wflow-py/wflow/wflow_lib.py
===================================================================
diff -u -ra16df12d232fa447d21e743d8bf7e8f94158cb4b -r6f6f2b34c39e80003a2a51dfb65e0508c6ad93ba
--- wflow-py/wflow/wflow_lib.py	(.../wflow_lib.py)	(revision a16df12d232fa447d21e743d8bf7e8f94158cb4b)
+++ wflow-py/wflow/wflow_lib.py	(.../wflow_lib.py)	(revision 6f6f2b34c39e80003a2a51dfb65e0508c6ad93ba)
@@ -61,7 +61,7 @@
     :return:
     """
 
-    _area = pcr2numpy(targetidmap,0.0).copy()
+    _area = pcr2numpy(targetidmap,0.0).copy().astype(float)
     _pt = pcr2numpy(sourceidmap,0.0).copy()
     _val = pcr2numpy(valuemap,0.0).copy()