Dear Jonathan, Thank you for the quick reply.
> The depth variable in your example is a 4D auxiliary coordinate variable. It > is CF-compliant, but it's not a CF parametric vertical coordinate variable. OK. Thanks. That was what I hoped for. Best wishes, Daniel Am 15.10.2019 um 19:31 schrieb Jonathan Gregory:
Dear DanielDoes "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?In section 4.3.3, it means that the physical vertical coordinate z(k,j,i), where i,j are indices of the horizontal dimensions and k of the vertical, can be written as as a mathematical function z=f(V1(k)[,V2(k),...],H1([t,]j,i)[,H2([t,]j,i)...]) where V1,... depend only on level, and H1,H2,... depend only on horizontal position (and perhaps on time). I think that describes all the cases of Appendix D, but someone may correct me! The entries in App D describe the physical vertical coordinate and how to compute it with the formula f.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?The depth variable in your example is a 4D auxiliary coordinate variable. It is CF-compliant, but it's not a CF parametric vertical coordinate variable.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"Best wishes Jonathan _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
-- Daniel Neumann Abteilung Datenmanagement Deutsches Klimarechenzentrum GmbH (DKRZ) Bundesstraße 45a • D-20146 Hamburg • Germany Phone: +49 40 460094-120 FAX: +49 40 460094-270 Email: daniel.neum...@dkrz.de URL: www.dkrz.de Geschäftsführer: Prof. Dr. Thomas Ludwig Sitz der Gesellschaft: Hamburg Amtsgericht Hamburg HRB 39784
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