7.2.2 NEWSIPS Quality Flags

  For NEWSIPS, $\nu$ flags are assigned to each datum in the SI and MX files. These are negative values, as are the IUESIPS $\epsilon$ values, but instead of keeping only the ``worst'' (i.e., most negative) condition, all problems are represented. Fifteen of the 16 bits (the 16th being the negative sign) in each flag are assigned to various problem conditions (see Table 7.2). Thus if a given flag has a value of -1056, that pixel is both saturated and SWET (the extraction algorithm) found a ``cosmic ray'' there--bits 6 (-32) and 11 (-1024) are set. See the NEWSIPS Image Processing Manual for details on how the flagging is done.

Patching procedures will generally set bit 6 (-32) in the $\nu$ value for user-flagged data.

 

 

$$\nu$$

Regions not photometrically corrected -16384 15

Telemetry dropouts (missing minor frames) -8192 14

Reseaux (in the ITF) -4096 13

Permanent ITF artifacts -2048 12

Saturated Pixel (w.r.t. ITF pixel DN) -1024 11

Warning track (near edge of PHOTOM region) -512 10

Extrapolated ITF curve (above level 12) -256 9

Extrapolated ITF curve (below level 1) -128 8

Cosmic ray hits & bright spots -64 7

SWET ``cosmic rays'' -32 6

Microphonics (LWR only) -16 5

Potential DMU corrupted pixel -8 4

Telemetry dropouts in extracted background -4 3

Uncalibrated data (extracted data only) -2 2 No known problem condition