CALIB_STATUS: Calibration status for an SDSS image

In the flat files there are arrays of length five for each band calib_status[5] ordered u,g,r,i,z. In the CAS these are named by band pass calibstatus_{band}.

Bit name	Binary digit	Description
PHOTOMETRIC	0	Photometric observations
UNPHOT_OVERLAP	1	Unphotometric observations, calibrated based on overlaps with clear, ubercalibrated data; done on a field-by-field basis. Use with caution.
UNPHOT_EXTRAP_CLEAR	2	Extrapolate the solution from the clear part of a night (that was ubercalibrated) to the cloudy part. Not recommended for use.
UNPHOT_EXTRAP_CLOUDY	3	Extrapolate the solution from a cloudy part of the night (where there is overlap) to a region of no overlap. Not recommended for use.
UNPHOT_DISJOINT	4	Data is disjoint from the rest of the survey (even though conditions may be photometric), the calibration is suspect. Not recommended for use.
INCREMENT_CALIB	5	Incrementally calibrated by considering overlaps with ubercalibrated data
RESERVED2	6	reserved for future use
RESERVED3	7	reserved for future use
PT_CLEAR	8	(INTERNAL USE ONLY in DR8 and later) PT calibration for clear data
PT_CLOUDY	9	(INTERNAL USE ONLY in DR8 and later) PT calibration for cloudy data
DEFAULT	10	(INTERNAL USE ONLY in DR8 and later) a default calibration used
NO_UBERCAL	11	(INTERNAL USE ONLY in DR8 and later) not uber-calibrated