@esc24 isn't fond of "rectilinear" either - it doesn't mean anything for him - so we've agreed to leave the function name as it is.

For the record, I believe I'm using the term as it is defined here: http://www.ncl.ucar.edu/Document/glossary.shtml#RectilinearGrid. So it doesn't relate to the *physical* arrangement of the data in the real world, merely the logical arrangement of an array and associated coordinate values.