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IMAGE_STATUS: Sky and instrument conditions of SDSS image

Bit name Binary digit Description
CLEAR 0 Clear skies
CLOUDY 1 Cloudy skies (unphotometric)
UNKNOWN 2 Sky conditions unknown (unphotometric)
BAD_ROTATOR 3 Rotator problems (set score=0)
BAD_ASTROM 4 Astrometry problems (set score=0)
BAD_FOCUS 5 Focus bad (set score=0)
SHUTTERS 6 Shutter out of place (set score=0)
FF_PETALS 7 Flat-field petals out of place (unphotometric)
DEAD_CCD 8 CCD bad (unphotometric)
NOISY_CCD 9 CCD noisy (unphotometric)