Hi Jonathon and CF list,
So I guess this would mean we need a 'coordinates' attribute on an ancilliary
variable
like say the 'temperature_qc_flag' below i.e. ?
dimensions:
time = 1 ;
pressure = UNLIMITED ; // (9 currently)
latitude = 1 ;
longitude = 1 ;
variables:
double time(time) ;
....
double latitude(latitude) ;
.....
double longitude(longitude) ;
.....
double pressure(pressure) ;
.......
double temperature(pressure) ;
temperature:_FillValue = -99.99 ;
temperature:standard_name = "sea_water_temperature" ;
temperature:units = "degrees_C" ;
temperature:valid_min = -2 ;
temperature:valid_max = 40 ;
temperature:ancillary_variables = "temperature_qc_flag" ;
temperature:coordinates = "time latitude longitude pressure" ;
byte temperature_qc_flag(pressure) ;
temperature_qc_flag:long_name = "quality control flag for temperature (primary
Level 1 flag)" ;
temperature_qc_flag:standard_name = "sea_water_temperature status_flag" ;
temperature_qc_flag:quality_control_convention = "IODE qc scheme March 2012" ;
temperature_qc_flag:valid_min = 1 ;
temperature_qc_flag:valid_max = 9 ;
temperature_qc_flag:flag_values = 1b, 2b, 3b, 4b, 9b ;
temperature_qc_flag:flag_meanings = "good not_evaluated_or_unknown suspect bad
missing" ;
temperature_qc_flag:coordinates = "time latitude longitude pressure" ;
Andrew
----- Original Message -----
From: "Jonathan Gregory" <j.m.gregory at reading.ac.uk>
To: <cf-metadata at cgd.ucar.edu>
Sent: Wednesday, April 18, 2012 6:53 PM
Subject: Re: [CF-metadata] a flag variable questions
>> Should flag variables, which are associated with data variables that have
>> explicit coordinates and grid mapping attributes, explicitly specify these
>> same coordinates and grid mapping attributes ?
>
> Yes, I think so. Ancillary variables are data variables, and therefore need to
> provide all the necessary metadata independently. Jonathan
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>
Received on Wed Apr 18 2012 - 17:09:19 BST
