Hello Lars,
1. Here you have two options for providing exactly equivalent information, and the choice is yours. I don't think there is any general reason to prefer one over the other. If you use the "amount", I believe you should have cell_methods "time: sum" and a time bounds variable. With "rate", on the other hand, you need cell_methods "time: mean", and time bounds variable. You need the time bounds variable in both cases: setting the units to "mm day-1" just specifies the unit of measure and doesn't tell the user that it is a representing the daily rainfall.
2. I'd advise sticking to ASCII for the title. I recently wrote a "guide" setting out some rules used for variables in CMIP6:
https://zenodo.org/record/2480853 .. I'd be interested in your comments on that. In CMIP6, as in CMIP5, we have tended not to include "daily" in the long names -- mainly because it is easier to use a fixed long name across multiple frequencies.
regards,
Martin
________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of B?rring Lars <Lars.Barring at smhi.se>
Sent: 24 January 2019 14:13
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] Two [simple] questions
Dear all,
Two simple questions of understanding:
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?
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) ?
Many thanks,
Lars
--
Lars B?rring
FDr, Forskare
PhD, Research Scientist
SMHI / Swedish Meteorological and Hydrological Institute
Rossby Centre
SE - 601 76 NORRK?PING
http://www.smhi.se<http://www.smhi.se/>
E-post / Email: lars.barring at smhi.se<mailto:lars.barring at smhi.se>
Tel / Phone: +46 (0)11 495 8604
Fax: +46 (0)11 495 8001
Bes?ksadress / Visiting address: Folkborgsv?gen 17
Received on Mon Jan 28 2019 - 04:57:50 GMT
