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Archive Pipeline Products |
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Bit definition (preliminary) for IRS *_bmask.fitsBits are numbered from zero (the Least Significant Bit) to 15 (the sign bit, which is not used).Each status bit describes a specific condition of the pixel; if the bit has the value 1, the condition is in effect; zero implies that the condition is not in effect. In general, more serious conditions are assigned to higher-numbered bits.
According to SIS document, SOSDL-SIS-PD-3005, vsn. 1.1, 6/27/2002 Bit # Condition --- -------------------------------------------- 0 Unused 1 Latent-image flag 2 Digital saturation detected in sample(s) along ramp 3 Radhit detection along ramp in sample(s) along ramp 4 Non-linearity correction could not be computed in sample(s) along ramp 5 Data bad in sample(s) along ramp 6 Droop or rowdroop removed using questionable value in sample(s) along ramp 7 Flat field applied using questionable value (flatap) 8 Flat field could not be applied (flatap) 9 Stray-light removal or crosstalk correction not applied 10 Saturated - beyond correctable non-linearity in sample(s) along ramp 11 Data missing in downlink in sample(s) along ramp 12 Only one usable plane 13 No usable planes 14 Pixel masked in pmask 15 [reserved: sign bit] Go back to IRS Data Products Example page
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help@spitzer.caltech.edu http://ssc.spitzer.caltech.edu/irs/products/bmask.html
