Dear Erik,
Please take a look at this thread in the mail list:
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/059879.html
The netcdf-U and uncertML could help you to encode the metadata you are
interested in.
Please come back with any progress you made.
Regards
Antonio
--
Antonio S. Cofiño
Dep. de Matemática Aplicada y
Ciencias de la Computación
Universidad de Cantabria
http://www.meteo.unican.es
On 22/03/18 11:49, Erik Quaeghebeur wrote:
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
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