diff --git a/imports/geometry/gpandas.py b/imports/geometry/gpandas.py
index 30658e52..ac9a0961 100644
--- a/imports/geometry/gpandas.py
+++ b/imports/geometry/gpandas.py
@@ -54,7 +54,7 @@ class GPandas:
     """
     if self._city is None:
       self._city = City(self._lower_corner, self._upper_corner, self._srs_name)
-      for ix, bldg in self._scene.iterrows():
+      for scene_index, bldg in self._scene.iterrows():
         geom = bldg.geom
         polygon = ShapelyPoly(geom['coordinates'][0])
         height = float(bldg['height_mean'])
@@ -62,7 +62,7 @@ class GPandas:
         trimesh.repair.fill_holes(building_mesh)
         trimesh.repair.fix_winding(building_mesh)
         year_of_construction = int(bldg['year_built'])
-        name = str(ix)
+        name = str(scene_index)
         lod = 1
         if year_of_construction > 2000:
           function = cte.RESIDENTIAL
@@ -71,13 +71,13 @@ class GPandas:
 
         surfaces = []
         face_normal = building_mesh.face_normals
-        for ix, face in enumerate(building_mesh.faces):
+        for face_index, face in enumerate(building_mesh.faces):
           points = []
           for vertex_index in face:
             points.append(building_mesh.vertices[vertex_index])
           solid_polygon = Polygon(points)
           perimeter_polygon = solid_polygon
-          s_type = cte.GROUND if face_normal[ix][2] == -1 else (cte.ROOF if face_normal[ix][2] == 1 else cte.WALL)
+          s_type = cte.GROUND if face_normal[face_index][2] == -1 else (cte.ROOF if face_normal[face_index][2] == 1 else cte.WALL)
           surface = Surface(solid_polygon, perimeter_polygon, surface_type=s_type)
           surfaces.append(surface)
         building = Building(name, lod, surfaces, year_of_construction, function, self._lower_corner, terrains=None)