Re: [CF-metadata] Quality flag values for missing data

2012-08-24 Thread Lynnes, Christopher S. (GSFC-6102)
On Aug 23, 2012, at 2:37 PM, Randy Horne wrote: > > What is the “generally accepted” approach for how a specific quality flag > value should be assigned for a corresponding data value (in the corresponding > data variable) that has a _FillValue ? > > Is it sufficient that, because the data v

Re: [CF-metadata] Quality flag values for missing data

2012-08-24 Thread John Graybeal
>From the QARTOD meetings I attended and the vocabularies in our repository, >I'm confident the oceanographic community uses a lot more QC flag approaches >than listed so far. So it is safe to say that there is no single approach. Still, the approaches from Randy and Roy certainly are accepted

Re: [CF-metadata] Quality flag values for missing data

2012-08-24 Thread Lowry, Roy K.
Hi Randy, The practice recommended for SeaDataNet is to specify a fill value for the flag that is defined in the flag convention as 'missing value'. I always feel more comfortable with explicit semantics. Cheers, Roy. From: CF-metadata [cf-metadata-bou

Re: [CF-metadata] Quality flag values for missing data

2012-08-24 Thread andrew walsh
Randy, The oceanographic community uses a set of integer QC flags (0 to 9) See document http://www.nodc.noaa.gov/GTSPP/document/qcmans/MG22rev1.pdf and section 2 'Quality Flagging'. One of the flags is for a 'missing value' = 9. Would that suit your fill value case? A netCDF sample in CDL is: