Dear Eduardo,
Dear list,
I asked (among other things):
I have 10-minute statistics […] data for which I know
the sampling frequency and therefore the number of samples. […]
How do I encode the sampling frequency and number of samples in a way that
these are accessible in a standard way?
I now use, e.g.,
variable.cell_methods = "time: mean (interval: 10 minutes comment: sampled
at 1 Hz, so 600 samples)"
but this puts the frequency information in an ‘opaque’ comment. […]
Eduardo replied (my thanks go out to him):
I am not sure if I understood properly your issue, so I
preferred to write directly to you instead of posting my answer
to the mailing list.
I have the feeling that what you are looking for would be:
variable:cell_methods = "time: mean (interval: 1 second)"
then the length of the interval would be perfectly defined in
the values of the time coordinate boundaries
time:bounds = "time_bnds" ;
so the number of observations could be obtained combining those
two elements: the sampling frequency information within the
"interval" bit of the cell_methods and the length of the
sampling interval defined by the "time_bnds" values.
And Eduardo is absolutely right about this. I had misunderstood the
definition of ‘interval’. It would nevertheless still be of interest to be
able to put this information—sampling frequency and number of samples—in
separate /number-valued/ attributes. Now the cell_methods field has to be
parsed and the value obtained combined with an interval length implicit in
the time_bounds variable.
Would you consider adding such attributes to the conventions?
(I would be grateful for any replies to my questions about encoding
uncertainties.)
Best,
Erik
--
https://ac.erikquaeghebeur.name
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