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Hello, That assessment seems to be the crux of the problem. Its look like CF wants a specific quality variable standard name, an approach that won't work for one quality variable applicable to many other data variables. But the standard_name in not required, is it ? So a simple "comment:" statement could remind the user the data variables a particular quality variable is applicable for. Or could you have a list of standard_names in the quality variable (would require new CF "rules" ) ? On Nov 1, 2011, at 11:38 AM, Jonathan Gregory wrote: > Dear Upendra > >> On 11/1/2011 10:47 AM, Upendra Dadi wrote: >>> The same issue occurs with World Ocean Database which consists of >>> mainly profile data. Each profile typically consists of several >>> variables measured along the depth. The quality flags used for all >>> the variable are same. > >>> On 10/31/2011 12:12 PM, Randy Horne wrote: >>>> The current CF conventions dictate that quality flags are >>>> attached to specific variables. The implication is that >>>> comforming with CF conventions would require the same quality >>>> flags to be stored multiple times in our NetCDF product files. > > Quality flags are attached to variables using the ancillary_variables att of > the data variable. If several data variables had the same quality flags and > dimensions, they could all point to the same quality variable. Perhaps the > problem is that the different variables have different standard names, and > this means the quality variables would also have different standard names > (and therefore could not be the same variable)? If that is the problem, > perhaps > we could find a way round it. Or have I missed the point? > > Best wishes > > Jonathan > > _______________________________________________ > cf-satellite mailing list > cf-satellite@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ -ed Ed Armstrong JPL Physical Oceanography DAAC 818 519-7607
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