Sorry for the misleading title in my recent posting. The correct title now appears here, copied from Martin's original posting (spelling error and all). best, Karl
On 11/28/18 4:47 PM, Taylor, Karl E. wrote: > Dear Alison and all, > > I support Martin's proposal > http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2018/020666.html to add > > indian_pacific_ocean > atlantic_arctic_ocean > > to the list of standard regions labels. > > best regards, > Karl > > On 11/21/18 1:40 PM, Martin Juckes - UKRI STFC wrote: >> Dear Jim, >> >> >> sorry, I stand corrected. Thank you for the detailed explanation. >> >> >> The conformance statements looks to be in error. >> >> >> Is there a clear rule for what makes a valid set of flag_values when used in >> conjunction with flag_masks? >> >> >> regards, >> >> Martin >> >> >> ________________________________ >> From: Jim Biard <[email protected]> >> Sent: 21 November 2018 20:50 >> To: Juckes, Martin (STFC,RAL,RALSP); [email protected] >> Subject: Re: [CF-metadata] Multiple zeros in flag_values allowed? >> >> >> Martin, >> >> The two subfields are independent. You can have very bad quality data and >> very bad weather at the same time. And that's how the flag masks and flag >> values are supposed to work. The mask splits off bit regions that are >> independent of one another. There is no ambiguity. >> >> The possible options and the values masked by the flag masks of 3 (binary >> 0011) and 12 (binary 1100) are: >> >> Weather Quality >> Binary Value >> Binary value & 3 >> Binary value & 12 >> >> very bad >> very bad >> 0000 >> 0 >> 0 >> >> very bad >> bad >> 0001 >> 1 >> 0 >> >> very bad >> good >> 0010 >> 2 >> 0 >> >> very bad >> very good >> 0011 >> 3 >> 0 >> >> bad very bad 0100 >> 0 >> 4 >> >> bad bad 0101 >> 1 >> 4 >> >> bad good 0110 >> 2 >> 4 >> >> bad very good 0111 >> 3 >> 4 >> >> good very bad 1000 >> 0 >> 8 >> >> good bad 1001 >> 1 >> 8 >> >> good good 1010 >> 2 >> 8 >> >> good >> very good 1011 >> 3 >> 8 >> >> very good very bad 1100 >> 0 >> 12 >> >> very good bad 1101 >> 1 >> 12 >> >> very good good 1110 >> 2 >> 12 >> >> very good very good 1111 >> 3 >> 12 >> >> >> Grace and peace, >> >> Jim >> >> On 11/21/18 12:03 PM, Martin Juckes - UKRI STFC wrote: >> >> Hello Jim, Julien, >> >> >> I'm not sure .. I think the conformance might be right here and your >> flag_values should be 0,1,2,3, 4, 8,12,16, and flag_masks 3,3,3,3,28,28,28,28 >> >> >> If, for instance, you very_bad_quality and very_bad_weather, then "var" >> should have value 4 = '00100000` in binary. Masked with 3 (11000000) gives >> zero, and masked with 28 (00111000) gives 4. Re-using the zero value would >> make zero ambiguous, so you need to start the 2nd sequence at 4. >> >> >> regards, >> >> Martin >> >> ________________________________ >> From: CF-metadata >> <[email protected]><mailto:[email protected]> >> on behalf of Jim Biard <[email protected]><mailto:[email protected]> >> Sent: 20 November 2018 16:51:24 >> To: [email protected]<mailto:[email protected]> >> Subject: Re: [CF-metadata] Multiple zeros in flag_values allowed? >> >> >> Julien, >> >> That's fine. The conformance document probably needs a better statement of >> the requirement when flag masks are used. >> >> Grace and peace, >> >> Jim >> >> On 11/20/18 11:40 AM, Julien Demaria wrote: >> Hi, >> >> We want to define a flags variable defining like that: >> var:flag_masks = 3, 3, 3, 3, 12, 12, 12, 12 ; >> var:flag_values = 0, 1, 2, 3, 0, 4, 8, 12 ; >> var:flag_meanings = “very_bad_quality bad_quality good_quality >> very_good_quality >> very_bad_weather >> bad_weather good_weather very_good_weather” ; >> >> I understand from http://cfconventions.org/Conformance/conformance.html that >> it is not allowed to use several time the same value (here zero) in >> flag_values: >> >> Requirements: >> >> · The flag_values attribute values must be mutually exclusive among >> the set of flag_values attribute values defined for that variable. >> So it means that for each new “bits combination” in the flags definition we >> lost one of the combination because we cannot use zero more than one time? >> Do you confirm this? What is the reason? >> >> Thanks in advance, >> Julien >> >> >> >> >> _______________________________________________ >> CF-metadata mailing list >> [email protected]<mailto:[email protected]><mailto:[email protected]><mailto:[email protected]> >> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata >> >> >> -- >> [CICS-NC] <http://www.cicsnc.org/><http://www.cicsnc.org/> Visit us on >> Facebook <http://www.facebook.com/cicsnc><http://www.facebook.com/cicsnc> >> Jim Biard >> Research Scholar >> Cooperative Institute for Climate and Satellites NC >> <http://cicsnc.org/><http://cicsnc.org/> >> North Carolina State University <http://ncsu.edu/><http://ncsu.edu/> >> NOAA National Centers for Environmental Information >> <http://ncdc.noaa.gov/><http://ncdc.noaa.gov/> >> formerly NOAA’s National Climatic Data Center >> 151 Patton Ave, Asheville, NC 28801 >> e: >> [email protected]<mailto:[email protected]><mailto:[email protected]><mailto:[email protected]> >> o: +1 828 271 4900 >> >> Connect with us on Facebook for >> climate<https://www.facebook.com/NOAANCEIclimate><https://www.facebook.com/NOAANCEIclimate> >> and ocean and >> geophysics<https://www.facebook.com/NOAANCEIoceangeo><https://www.facebook.com/NOAANCEIoceangeo> >> information, and follow us on Twitter at >> @NOAANCEIclimate<https://twitter.com/NOAANCEIclimate><https://twitter.com/NOAANCEIclimate> >> and >> @NOAANCEIocngeo<https://twitter.com/NOAANCEIocngeo><https://twitter.com/NOAANCEIocngeo>. >> >> >> >> -- >> [CICS-NC] <http://www.cicsnc.org/> Visit us on >> Facebook <http://www.facebook.com/cicsnc> Jim Biard >> Research Scholar >> Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/> >> North Carolina State University <http://ncsu.edu/> >> NOAA National Centers for Environmental Information <http://ncdc.noaa.gov/> >> formerly NOAA’s National Climatic Data Center >> 151 Patton Ave, Asheville, NC 28801 >> e: [email protected]<mailto:[email protected]> >> o: +1 828 271 4900 >> >> Connect with us on Facebook for >> climate<https://www.facebook.com/NOAANCEIclimate> and ocean and >> geophysics<https://www.facebook.com/NOAANCEIoceangeo> information, and >> follow us on Twitter at >> @NOAANCEIclimate<https://twitter.com/NOAANCEIclimate> and >> @NOAANCEIocngeo<https://twitter.com/NOAANCEIocngeo>. >> >> _______________________________________________ >> CF-metadata mailing list >> [email protected] >> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
