The level of review is indicated by three degrees of descriptors:  quality vlues, quality flags, and level of quality control.  

Data Quality Values		
Value	Definition	Description
0   	  NONE	        Quality not yet determined
1   	  BAD	        Data is bad
2   	  SUSPECT	Quality might be bad: needs review before release
3   	  UNKNOWN	Quality indescribable; neither good nor suspect
4   	  GOOD	        Data is acceptable for distribution
8   	  REPLACED	With data of a higher quality control level
-9  	  MISSING	The data has been reported as missing

Data Quality Flags			
Value	Definition	Description			2° Description
1	OK		valid				Data is acceptable
2			
3	INV		invalid				Data has been manually marked as bad
4	SUSPECT		data presumed invalid 		data has been marked as suspect and is being investigated
5			
6	UNK		unknown problem			Data could be suspect due to a programming, analysis, recording error, or gap in documentation
7	NULL		null data			Data missing, lost or null
8			
9			
10	FAULTY		instrument failure/drift	Instrument failure or drift has been indicated for this data
11	OOR		out of range			Data exceeds engineering range specified for instrument, valid range for datatype or range that calculation should allow
12			
13			
14	CLIM		climatology			Data outside of reasonable range based on climatology 


Data Quality Control		
Value	Definition	Description
0	NONE	 	No quality control done
1	PROCESSED	Automated quality control done and initial value
2	REVIEWED	Manually reviewed; suspect data marked as good or bad.
3	POST-PROCESSED	Additional review performed.
4	FINAL		Post-processed review final, error estimates unavailable.
5	FINAL		Post-processed, post-calibrated or adjustment review complete, QC error estimate available.