Re: [cf-pointobsconvention] Should Z Coordinates be required?

Dear John

Usually z is useful, but I don't think we should insist on providing something
which is not really useful just to fill a slot which has been mandated. Also I
don't think we should confuse the z of the quantity being measured with the z
of the platform which is measuring it.

John C suggests people may be prompted to supply info if the CF checker or some
other such device points out it is missing. That may be more effective than
laying down laws, which people may ignore. (Another argument is that an
effective convention such as CF should contain things which people will agree
to do - albeit a bit reluctantly - as they see the value of it, but should be
careful not to prescribe excessive burdens that they will ignore as they don't
see the use of them.) So if a rule can be given (in terms of something that a
file-checker can apply) for when a z coordinate would usefully be present, this
can be made a recommendation, and the CF checker can issue a warning if the
z coord is missing. It gives warnings for unsatisfied recommendations (when
that can be detected) and errors for unsatisfied requirements.

Best wishes

Jonathan