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[CF-metadata] Question to Parametric Vertical Coordinates

From: Daniel Neumann <daniel.neumann>
Date: Tue, 15 Oct 2019 17:04:44 +0200

Dear List,

I am not sure if I interprete the word "parametric" correctly.

Does "Parametric Vertical Coordinates" mean that there is a mathematical
function, which describes the relation between the relevant (auxiliary)
coordinate variables and the parametric vertical coordinate?

Speaking in terms of the example provided further below: Value of `depth` is a
`f(time, lev, lat, lon)`, whereas `f` is a mathematical function with
considerably less parameters than `depth` has values. Then `depth` is a
parametric vertical coordinate.

Formulated the other way arond: Is `depth` NOT a parametric vertical coordinate
if its values are somehow set by hand (by a human), calculated by some nested
if-clause, or by some iterative procedure?

If `depth` is not a parametric vertical coordinate in this sense, am I allowed
to use it in a CF-compliant file?

Example:

...
int lev(lev):
        lev:standard_name = "model_level_number" ;
        lev:long_name = "model_level_number" ;
        lev:positive = "down" ;
        lev:units = "1" ;
double depth(time, lev, lat, lon);
        depth:long_name = "depth" ;
        depth:positive = "down" ;
        depth:standard_name = "depth" ;
        depth:units = "m" ;
        depth:axis = "Z" ;
float some_data_variable(time, lev, lat, lon);
        some_data_variable:standard_name = "some_standard_name" ;
        some_data_variable:units = "some_unit" ;
        some_data_variable:coordinates = "depth"
...


Cheers,
Daniel


-- 
Dr. Daniel Neumann
Abteilung Datenmanagement
Deutsches Klimarechenzentrum GmbH (DKRZ)
Bundesstra?e 45a ? D-20146 Hamburg ? Germany
Phone: +49 40 460094-120
FAX:   +49 40 460094-270
Email: daniel.neumann at dkrz.de
URL:   www.dkrz.de
Gesch?ftsf?hrer: Prof. Dr. Thomas Ludwig
Sitz der Gesellschaft: Hamburg
Amtsgericht Hamburg HRB 39784
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Received on Tue Oct 15 2019 - 09:04:44 BST

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