It would be nice to have a method on a Field object that will identify the presence of parametric vertical coordinates and then create a new field that also contains the corresponding dimensional coordinates. This will make the question in #138 much more easy to deal with.

The syntax would simply be

>>> g = f.method_name()  # method name to be decided later!

because the field already contains all of the information required. If any bit are missing or incorrect, and exception would be raised.