Nan ---
Just to better understand your setup: the data you are referring to comes from a totalizer rain gauge, where the data may look like
day i, 321 mm
day j, 321 mm
day k, 333 mm
day l, 333 mm
day k, 399 mm
and this is what you record , and store?
/Lars
________________________________________
Fr?n: CF-metadata [cf-metadata-bounces at cgd.ucar.edu] för Nan Galbraith [ngalbraith at whoi.edu]
Skickat: den 24 januari 2019 19:42
Till: cf-metadata at cgd.ucar.edu
?mne: Re: [CF-metadata] Two [simple] questions
I sincerely hope you're wrong about these standard names, Jonathan!
We include precip in our met files, and use the
lwe_thickness_of_precipitation_amount
standard name to report the actual level of water in a rain gauge.
It is NOT a rate of precip, which is calculated (roughly, for rain
gauges) by a first difference.
If the values in this variable were interpreted as a rate, it would be
completely incorrect; values
that are unchanging convert to a rate of 0, no matter how high they may be.
Maybe I've been mis-using this standard name?
Thanks - Nan
On 1/24/19 9:34 AM, Jonathan Gregory wrote:
> Dear Lars
>
>> 1. If I have (observed) daily precipitation with unit mm/day and want to store this in a CF compliant file, should I use standard name
>> --- "lwe_thickness_of_precipitation_amount" with canonical unit metre and the "per day" part is inferred from the time bounds, or
>> --- "lwe_precipitation_rate" having canonical unit "m s-1",
>> --- if both are acceptable, is one to be preferred?
> You can use whichever you prefer. They would also be distinguished by
> cell_methods. The first is extensive in time, so it has cell_methods of sum,
> the second is intensive and has cell_methods of mean.
>
>> 2. The long_name is free, but should be descriptive. I am thinking of this as a succinct plot title, so the question is what practical limitation there might be in relation to different software. Is it advisable to use ASCII spaces (from
>> Github issue #141 indicates that only standard ASCII character set should be used) ?
> I expect others have something useful to say about that.
>
> Best wishes
>
> Jonathan
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Received on Thu Jan 24 2019 - 13:36:58 GMT
