fix zip passing to grid

components/groundstation.py

@@ -33,7 +33,7 @@ ncoords = len(args.coords)
 grid = UnstructuredGrid("pamtra-grid", [3]*ncoords,
                         [*coords[:,0], *(coords[:,0]+0.1), *coords[:,0]],
                         [*coords[:,1], *coords[:,1], *(coords[:,1]+0.1)],
-                        zip(range(ncoords), range(ncoords, 2*ncoords), range(2*ncoords, 3*ncoords)))
+                        np.array(zip(range(ncoords), range(ncoords, 2*ncoords), range(2*ncoords, 3*ncoords))))
 points = grid.def_points(Location.CELL,
                          coords[:,0], coords[:,1])