Add area

handle_mtl_ds_workflow.py

@@ -190,3 +190,8 @@ single_parts_layer.create_spatial_index()
 # The process of instantiating a new layer
 # (including print and create part) can be a method
 # Also experiment importing input_paths_and_layers
+
+# Add an area field
+single_parts_layer.add_field('Area')
+single_parts_layer.assign_area('Area')
+