[CF-metadata] [cf-satellite] Sharing quality flags amongmultiple variables

From: Mike Grant <mggr>
Date: Wed, 02 Nov 2011 20:22:24 +0000

On 02/11/11 20:20, Mike Grant wrote:
> I'll put that in another email as this is already way too long and I
> suspect it's unworkable ;)

Trying to address wanting different standard_names, shared or different
flag_meanings and shared or different flag data..

Extend the idea in Jonathan's #2 proposal so that the contents of any
variable can be farmed out to others, by allowing a variable to
"#include" another variable and then override its values.

  // direct use of flags data
 float a(...);
    a:ancillary_variables = "flags_data" ;

  // same flags data as a, different meaning
 float b(...) ;
    b:ancillary_variables = "b_flags_container" ;

  // same flags data as a, different meaning, different name
 float c(...) ;
    c:ancillary_variables = "c_flags_container" ;

  // different flags data, same meaning
 float d(...) ;
    d:ancillary_variables = "d_flags_container" ;

  // contains actual flags data
 int flags_data(...) ;
     // contains actual flags data
    flags_data:#include_variable = "flags_data_meanings";
    flags:standard_name = "flags generic name";

  // meanings for flags
 int flags_data_meanings() ;
    flags:flag_values = "0, 1, 2, 4, 8, ..." ;
    flags:flag_meanings = "meaning0 meaning1 ... meaning 4 ....";

  // same flags data as a, subset of or different meaning
 int b_flags_container;
    b_flags_container:#include_variable = "flags_data";
    b_flags_container:flag_values = "0, 1, 2";
    b_flags_container:flag_meanings = "meaning0 meaning1 meaning2...";

  // same flags data as a, different meaning and different name
 int c_flags_container;
    c_flags_container:#include_variable = "flags_data";
    c_flags_container:standard_name = "overridden flags name";
    c_flags_container:flag_values = "0, 1, 4, 8";
    c_flags_container:flag_meanings = "meaning0 meaning1 meaning3 meaning4";

  // different flags data, same meaning as a
 int d_flags_data(...);
     // contains actual flags data, different to flags_data
    d_flags_container:#include_variable = "flags_data_meanings";
    d_flags_data:standard_name = "something";
.....

While this is quite powerful and relatively easy to implement, it leads
CF down a scary path of inheritance, confusion, etc and I wouldn't be
surprised if we didn't want to go there ;)

Cheers,

Mike.

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Received on Wed Nov 02 2011 - 14:22:24 GMT