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#74: Allow sharing of ancillary variables among multiple data variables
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  Reporter:  [email protected]  |       Owner:  
[email protected]             
      Type:  enhancement               |      Status:  new                      
                 
  Priority:  medium                    |   Milestone:                           
                 
 Component:  cf-conventions            |     Version:                           
                 
Resolution:                            |    Keywords:  "ancillary data" 
"standard name modifiers"
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Comment (by [email protected]):

 Dear All:

 This post defines "strawman" redlines to the CF standard to reflect this
 enhancement in the CF standard.

 (1)
 In paragraph 3.5 Flags ...

 Change example 3.3 to be:

 byte current_speed_qc(time, depth, lat, lon) ;
     current_speed_qc:long_name = "Current Speed Quality" ;
     current_speed_qc:standard_name = "status_flag" ;
     current_speed_qc:_FillValue = -128b ;
     current_speed_qc:valid_range = 0b, 2b ;
     current_speed_qc:flag_values = 0b, 1b, 2b ;
     current_speed_qc:flag_meanings = "quality_good sensor_nonfunctional
 outside_valid_range" ;

 The only change made to this example is the removal of the
 "sea_water_speed" from the flag variable's standard_name.

 Immediately after the example, add the following sentence:

 "Note that the data variable containing current speed has an
 ancillary_variables attribute with a value containing current_speed_qc."

 (2)
 In Appendix C. Standard Name Modifiers ...

 Add the following statement after the existing description for the
 number_of_observations modifier.

 "The use of this modifier is deprecated and the standard_name
 number_of_observations is preferred to describe
 this type of metadata variable."

 Add the following statement after the existing description for the
 status_flag modifier.

 "The use of this modifier is deprecated and the standard_name status_flag
 is preferred to describe
 this type of metadata variable."

 (3)
 Note that a post requesting standard_names status_flag and
 number_of_observations are posted to the CF metadata message board.


 very respectfully,

 randy

-- 
Ticket URL: <https://cf-pcmdi.llnl.gov/trac/ticket/74#comment:52>
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