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VII. User's Guide to the WISE 3-Band Cryo Data Release


2. 3-Band Cryo Data Products

g. Single-exposure (Level 1) Frame Metadata Column Descriptions

The following table contains brief descriptions of all metadata information that is relevant to the processing of Single-exposure (level 1) images and the extraction of sources from the corresponding Single-exposure images. The table contains the unique scan ID for a specific scan frame and the reconstructed right ascension and declination of the level 1b frame center. Much of the information in this table is processing-specific, and may not be of interest to general users (e.g. flags indicating whether frames have been processed or not, and the date and time for starting of the pipeline, etc.). The metadata table also contains some characterization and derived statistics of the Single-expsoure image frames, basic photometric parameters used for photometry and derived statistics for extracted sources and artifacts. For example, it contains median pixel values of the coadded sky coverage map, the number of sources with profile-fit photometry Signal-to-Noise (SNR) greater than 3, and the total number of real sources affected by artifacts such as electronic ghosts, etc.

The columns in the following table are:


Column NameFormatUnitsnullsDescription 
scan_id %6s ---- no Scan identifier. This is a six character string that identifies a block of survey exposures that are acquired between two flight system maneuvers, such as reorientation of the instrument boresight near the ecliptic poles, or slews to acquire TDRSS for data downlink contacts. Because maneuvers often take place near the ecliptic poles, the scan number is roughly associated with a half-orbit's worth of images. However, scans can cover less or more than half of the arc between ecliptic poles.

The scan_id has the general form SSSSSx, where

  • SSSSS is a zero-filled, five-digit integer that is twice the WISE orbit number. The orbit number increments each time the flight system passes the north ecliptic pole (NEP). Orbit number 1 was defined to start with the fictitious NEP passage immediately prior to WISE launch.

  • x   is a letter assigned based on sequential count of scans started in a specific half-orbit. The first scan has x="a", the next x="b", up to a maximum of x="d" for scans in the Preliminary Release.

The first scan whose data are used in the Preliminary Data Release is scan 07101b. This was the second scan after the SEP crossing in the 3550th WISE orbit. The final scan included in the Release is 08744a, the first scan after the NEP crossing in the 4372nd WISE orbit.

 
frame_num %3d ---- no Number of the frameset on which this source was extracted. The identifier has the general form MMM, a zero-filled three-digit number.

The frameset number is computed based on time bins which count from the scan start time:

fr_num = int[(((frame_utc - dt_beg) - scan_start_utc)/bin_size] + 1

where

  • int[] means truncate to an integer
  • frame_utc is the nominal frame exposure center UTC (when the boresite crosses the image center) in seconds
  • dt_beg is 4.4s. This is a nominal offset to approximate when the exposure began
  • scan_start_utc is the scan start time in seconds
  • bin_size is 10s.

For example, a frame with a start time 1234 secs after the scan start time would have a frame number of 124.

N.B.

  • Frame_num is not a frameset sequence number

  • As a result of using a 10 sec bin, every 11th frame skips a number, so it is normal to see breaks in the frame numbering and it doesn't indicate missing data.

  • Because frameset numbering is based on the predicted scan start time from the survey plan, and because frameset data may not start being acquired until well after the start of the scan, frameset numbers often do not start at 1 for a scan.
 
date_proc %20s datetimeZ no The date and time of the start of WISE pipeline processing in Coordinated Universal Time (UTC). For example, scan 07200a, frameset number 165 was processed starting at 2011-10-22 21:14:06.  
elapsed_t %7.2f sec no The elapsed processing time from the start of the WISE pipeline processing, in units of seconds. This is wall clock time.  
ucpu_t %7.2fsecno User CPU time for pipeline processing, in seconds.  
scpu_t %6.2fsecno System CPU time for pipeline processing, in seconds.  
ra0 %10.6f deg no Right ascension (J2000) of the raw image frame (level 0) center.  
dec0 %10.6f deg no Declination (J2000) of the raw image frame (level 0) center.  
crota0 %17.12f deg no Image twist of the raw image (level 0): the position of the image y-axis West of North at the EQUINOX; in the opposite direction of the conventional Position Angle, where position angle (P.A.) = -CROTA0.  
rssrate %17.14f arcmin/s no The root square sum of the three telescope axes spacecraft scan rates.  
moon_sep %7.3f deg no The angular distance from the frame center to the Moon.  
saa_sep %7.3f deg no The angular distance from the frame center to South Atlantic Anomaly (SAA) boundary. Negative values indicate the frame center is inside the boundary.  
ra %10.6f deg no The right ascension (J2000) of the position-reconstructed Single-expsoure frame (level 1b) center with respect to the 2MASS PSC reference frame.  
dec %10.6f deg no The declination (J2000) of the position-reconstructed Single-exposure frame (level 1b) center with respect to the 2MASS PSC reference frame.  
crota %17.12f deg no Image twist of the position-reconstructed, Single-exposure frame (level 1b): the position of the image y-axis West of North at the EQUINOX; in the opposite direction of the conventional Position Angle, where position angle (P.A.) = -CROTA.  
bandbits %2d ---- no Bit-wise flag that indicates which bands have been processed, starting at band 1 = bit 0. When three bands have been processed, the value is 7.  
w1bandrun %1d ---- no This flag indicates whether band 1 has been processed; 1 means yes and 0 means no.  
w2bandrun %1d ---- no This flag indicates whether band 2 has been processed; 1 means yes and 0 means no.  
w3bandrun %1d ---- no This flag indicates whether band 3 has been processed; 1 means yes and 0 means no.  
date_obs %24s datetimeZ no The date and time of the mid-point of the frameset exposure, in UTC. The mid-point is defined as the time the optical boresight crosses the center of the WISE focal planes. This time is the same for all bands, whereas the exposure times in W1 and W2 are different than in W3.  
mjd %12.6f day yes The Modified Julian Date of the mid-point of the frameset exposure. The mid-point is defined as the time the optical boresight crosses the center of the WISE focal planes. This time is the same for all bands, whereas the exposure times in W1 and W2 are different than in W3.  
wsds_vsn %20s ---- no The version number of the WISE pipeline used for this current data release.  
date_dbprep %20s datetimeZ no The date and time when the data was prepared by the WISE archive software DBPREP for the archive loading, in UTC.  
draf %10.3f arcsec no The true-angular difference in RA between the band-frame centers before and after position reconstruction, for the lowest band processed.  
ddecf %10.3f arcsec no The angular difference in declination between the band-frame centers before and after position reconstruction, for the lowest band processed.  
dpaf %12.3f arcsec no The difference in the frame position angle before and after position reconstruction, for the lowest band processed.  
sigraf %11.6f arcsec no The final band-frame sigma on RA for the lowest band processed.  
sigdcf %11.6f arcsec no The final band-frame sigma on declination for the lowest band processed.  
sigpaf %9.3f arcsec no The final band-frame sigma on PA for lowest band processed.  
qflgsf %14s ---- no The single-frame positional reconstruction quality flag.  
band_prex %1d ---- no The lowest band processed by the Single-frame positional reconstruction pipeline (SFPREX). This band is used for calculating draf, ddecf, dpaf, sigraf, sigdcf, and sigpaf.  
dra_frame %10.3f arcsec no The right ascension difference (RA) between the level 0 and refined level 1 frame centers.  
ddec_frame %10.3f arcsec no The declination difference (DEC) between the level 0 and the refined level 1 frame centers.  
dpa_frame %11.3f arcsec no The position angle difference between the level 0 and the refined level 1 frame centers.  
moon_masked %4s ---- no The 4-character flag (0/1), one character per band, which indicates whether the frame is within the moon-mask area in each band.  
w1msknumtotbad %7d---- yes The number of pixels in the single-exposure image that were tagged in the frame mask with a non-zero value for band 1. Not all conditions under which pixels were tagged are fatal.  
w2msknumtotbad %7d---- yes The number of pixels in the single-exposure image that were tagged in the frame mask with a non-zero value for band 2. Not all conditions under which pixels were tagged are fatal.  
w3msknumtotbad %7d---- yes The number of pixels in the single-exposure image that were tagged in the frame mask with a non-zero value for band 3. Not all conditions under which pixels were tagged are fatal.  
w1msknumdynabad %7d---- yes The number of dynamically masked bad-pixel transients in the single-exposure image for band 1. See section IV.4.a.viii.3.  
w2msknumdynabad %7d---- yes The number of dynamically masked bad-pixel transients in the single-exposure image for band 2. See section IV.4.a.viii.3.  
w3msknumdynabad %7d---- yes The number of dynamically masked bad-pixel transients in the single-exposure image for band 3. See section IV.4.a.viii.3.  
w1msknumsat %7d ---- yes The number of pixels in the single-exposure image that saturated at any sample-up-the-ramp read for band 1.  
w2msknumsat %7d ---- yes The number of pixels in the single-exposure image that saturated at any sample-up-the-ramp read for band 2.  
w3msknumsat %7d ---- yes The number of pixels in the single-exposure image that saturated at any sample-up-the-ramp read for band 3.  
w1intnspikelo %7d ---- yes The number of low valued "pixel-spike" outliers falling in the low-tail of the frame-pixel distribution for band 1. These are defined as spatial outliers, i.e., with respect to other neighboring pixels.  
w2intnspikelo %7d ---- yes The number of low valued "pixel-spike" outliers falling in the low-tail of the frame-pixel distribution for band 2. These are defined as spatial outliers, i.e., with respect to other neighboring pixels.  
w3intnspikelo %7d ---- yes The number of low valued "pixel-spike" outliers falling in the low-tail of the frame-pixel distribution for band 3. These are defined as spatial outliers, i.e., with respect to other neighboring pixels.  
w1intnspikehi %7d ---- yes The number of high valued "pixel-spike" outliers falling in the high-tail of the frame-pixel distribution for band 1. These are defined as spatial outliers, i.e., with respect to other neighboring pixels.  
w2intnspikehi %7d ---- yes The number of high valued "pixel-spike" outliers falling in the high-tail of the frame-pixel distribution for band 2. These are defined as spatial outliers, i.e., with respect to other neighboring pixels.  
w3intnspikehi %7d ---- yes The number of high valued "pixel-spike" outliers falling in the high-tail of the frame-pixel distribution for band 3. These are defined as spatial outliers, i.e., with respect to other neighboring pixels.  
w1intmean %15.6fDN yes The mean pixel value in the intensity image of the single-exposure frame for band 1.  
w2intmean %15.6fDN yes The mean pixel value in the intensity image of the single-exposure frame for band 2.  
w3intmean %15.6fDN yes The mean pixel value in the intensity image of the single-exposure frame for band 3.  
w1intmedian %15.6fDN yes The median pixel value in the intensity image of the single-exposure frame for band 1.  
w2intmedian %15.6fDN yes The median pixel value in the intensity image of the single-exposure frame for band 2.  
w3intmedian %15.6fDN yes The median pixel value in the intensity image of the single-exposure frame for band 3.  
w1intstddev %15.6fDN yes The standard deviation (RMS) from the mean (unbiased population estimate) for band 1.  
w2intstddev %15.6fDN yes The standard deviation (RMS) from the mean (unbiased population estimate), band 2.  
w3intstddev %15.6fDN yes The standard deviation (RMS) from the mean (unbiased population estimate), band 3.  
w1intsigltmadmed %15.6fDN yes The lower-tail median absolute deviation from the median (a robust estimate of sigma) for pixels in the intensity image of the single-exposure frame for band 1.  
w2intsigltmadmed %15.6fDN yes The lower-tail median absolute deviation from the median (a robust estimate of sigma) for pixels in the intensity image of the single-exposure frame for band 2.  
w3intsigltmadmed %15.6fDN yes The lower-tail median absolute deviation from the median (a robust estimate of sigma) for pixels in the intensity image of the single-exposure frame for band 3.  
w1inti16_84range %15.6fDN yes A more robust estimate of the full (single-exposure) image sigma for band 1 based on half the percentile difference: 0.5*(84th - 16th), where percentiles are computed from pixels in the intensity image.  
w2inti16_84range %15.6fDN yes A more robust estimate of the full (single-exposure) image sigma for band 2 based on half the percentile difference: 0.5*(84th - 16th), where percentiles are computed from pixels in the intensity image.  
w3inti16_84range %15.6fDN yes A more robust estimate of the full (single-exposure) image sigma for band 3 based on half the percentile difference: 0.5*(84th - 16th), where percentiles are computed from pixels in the intensity image.  
w1intmed16ptile %15.6fDN yes A robust estimate of sigma using the difference of the 50th - 16th percentile values for pixels in the intensity image of the single-exposure image for band 1.  
w2intmed16ptile %15.6fDN yes A robust estimate of sigma using the difference of the 50th - 16th percentile values for pixels in the intensity image of the single-exposure image for band 2.  
w3intmed16ptile %15.6fDN yes A robust estimate of sigma using the difference of the 50th - 16th percentile values for pixels in the intensity image of the single-exposure image for band 3.  
w1intratmedrange %15.6f---- yes The ratio of (84th percentile - median) / (median - 16th percentile) for pixels in the intensity image of the single-exposure frame for band 1.  
w2intratmedrange %15.6f---- yes The ratio of (84th percentile - median) / (median - 16th percentile) for pixels in the intensity image of the single-exposure frame for band 2.  
w3intratmedrange %15.6f---- yes The ratio of (84th percentile - median) / (median - 16th percentile) for pixels in the intensity image of the single-exposure frame for band 3.  
w1unclocscal2 %15.6f---- yes The ratio of the local RMS in intensity pixel fluctuations using the lower-tail deviation from the mode to the modal pixel uncertainty from the model, for band 1. It is a pseudo-χ2 measure that is robust against the presence of sources and bright, extended structure.  
w2unclocscal2 %15.6f---- yes The ratio of the local RMS in intensity pixel fluctuations using the lower-tail deviation from the mode to the modal pixel uncertainty from the model, for band 2. It is a pseudo-χ2 measure that is robust against the presence of sources and bright, extended structure.  
w3unclocscal2 %15.6f---- yes The ratio of the local RMS in intensity pixel fluctuations using the lower-tail deviation from the mode to the modal pixel uncertainty from the model, for band 3. It is a pseudo-χ2 measure that is robust against the presence of sources and bright, extended structure.  
naxis %2d ---- no Number of data axes; it is always '2' for two-dimensional images.  
w1naxis1 %4d ---- yes Length of data axis 1 or number of columns in the band 1 image.  
w1naxis2 %4d ---- yes Length of data axis 2 or number of rows in the band 1 image.  
w2naxis1 %4d ---- yes Length of data axis 1 or number of columns in the band 2 image.  
w2naxis2 %4d ---- yes Length of data axis 2 or number of rows in the band 2 image.  
w3naxis1 %4d ---- yes Length of data axis 1 or number of columns in the band 3 image.  
w3naxis2 %4d ---- yes Length of data axis 2 or number of rows in the band 3 image.  
w1crpix1 %6.1f ---- yes Axis 1 reference pixel at position crval1,crval2: 0.5*(w1naxis1+1), for band 1.  
w1crpix2 %6.1f ---- yes Axis 2 reference pixel at position crval1,crval2: 0.5*(w1naxis2+1), for band 1.  
w2crpix1 %6.1f ---- yes Axis 1 reference pixel at position crval1,crval2: 0.5*(w2naxis1+1), for band 2.  
w2crpix2 %6.1f ---- yes Axis 2 reference pixel at position crval1,crval2: 0.5*(w2naxis2+1), for band 2.  
w3crpix1 %6.1f ---- yes Axis 1 reference pixel at position crval1,crval2: 0.5*(w3naxis1+1), for band 3.  
w3crpix2 %6.1f ---- yes Axis 2 reference pixel at position crval1,crval2: 0.5*(w3naxis2+1), for band 3.  
w1crval1 %16.12f deg yes The reference Right Ascension (J2000) position at the image center (crpix1, crpix2) for EQUINOX, for band 1.  
w1crval2 %16.12f deg yes The reference Declination (J2000) position at the image center (crpix1, crpix2) for EQUINOX, for band 1.  
w1crder1 %20.14e deg yes The uncertainty value in crval1 (RA), band 1.  
w1crder2 %20.14e deg yes The uncertainty value in crval2 (DEC), band 1.  
w1csdradec %21.14e deg yes The costandard deviation in crval1 and crval2 (RA and Dec) for band 1, the square root of the absolute value of the covariance between RA and Dec with the sign of the covariance re-attached to the square-root if it was originally negative.  
w2crval1 %16.12f deg yes The reference Right Ascension (J2000) position at the image center (crpix1, crpix2) for EQUINOX, for band 2.  
w2crval2 %16.12f deg yes The reference Declination (J2000) position at the image center (crpix1, crpix2) for EQUINOX, for band 2.  
w2crder1 %20.14e deg yes The uncertainty value in crval1 (RA) for band 2.  
w2crder2 %20.14e deg yes The uncertainty value in crval2 (DEC) for band 2.  
w2csdradec %21.14e deg yes The costandard deviation in crval1 and crval2 (RA and Dec) for band 2, the square root of the absolute value of the covariance between RA and Dec with the sign of the covariance re-attached to the square-root if it was originally negative.  
w3crval1 %16.12f deg yes The reference Right Ascension (J2000) position at the image center (crpix1, crpix2) for EQUINOX, for band 3.  
w3crval2 %16.12f deg yes The reference Declination (J2000) position at the image center (crpix1, crpix2) for EQUINOX, for band 3.  
w3crder1 %20.14e deg yes The uncertainty value in crval1 (RA) for band 3.  
w3crder2 %20.14e deg yes The uncertainty value in crval2 (DEC) for band 3.  
w3csdradec %21.14e deg yes The costandard deviation in crval1 and crval2 (RA and Dec) for band 3, the square root of the absolute value of the covariance between RA and Dec with the sign of the covariance re-attached to the square-root if it was originally negative.  
ctype1 %13s -- no Projection type for axis 1. It is always set to use the SIN (orthographic) projection; for the definition, see Calabretta & Greisen, 2002.  
ctype2 %13s -- no Projection type for axis 2. It is always set to use the SIN (orthographic) projection; for the definition, see Calabretta & Greisen, 2002.  
equinox %6.1f year no The equinox of the World Coordinate System (WCS).  
w1elon %16.12f deg yes Ecliptic longitude at the center of the image for band 1.  
w1elat %16.12f deg yes Ecliptic latitude at the center of the image for band 1.  
w1glon %16.12f deg yes Galactic longitude at the center of the image for band 1.  
w1glat %16.12f deg yes Galactic latitude at the center of the image for band 1.  
w2elon %16.12f deg yes Ecliptic longitude at the center of the image for band 2.  
w2elat %16.12f deg yes Ecliptic latitude at the center of the image for band 2.  
w2glon %16.12f deg yes Galactic longitude at the center of the image for band 2.  
w2glat %16.12f deg yes Galactic latitude at the center of the image for band 2.  
w3elon %16.12f deg yes Ecliptic longitude at the center of the image for band 3.  
w3elat %16.12f deg yes Ecliptic latitude at the center of the image for band 3.  
w3glon %16.12f deg yes Galactic longitude at the center of the image for band 3.  
w3glat %16.12f deg yes Galactic latitude at the center of the image for band 3.  
w1ra1 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #1 (crpix1,crpix2 = -0.5,-0.5) for band 1.  
w1dec1 %16.12f deg yes Declination (DEC, J2000) at the image corner #1 (crpix1,crpix2 = -0.5,-0.5) for band 1.  
w1ra2 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #2 (crpix1,crpix2 = naxis1+0.5,-0.5) for band 1.  
w1dec2 %16.12f deg yes Declination (DEC, J2000) at the image corner #2 (crpix1,crpix2 = naxis1+0.5,-0.5) for band 1.  
w1ra3 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #3 (crpix1,crpix2 = naxis1+0.5,naxis2+0.5) for band 1.  
w1dec3 %16.12f deg yes Declination (DEC, J2000) at the image corner #3 (crpix1,crpix2 = naxis1+0.5,naxis2+0.5) for band 1.  
w1ra4 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #4 (crpix1,crpix2 = -0.5,naxis2+0.5) for band 1.  
w1dec4 %16.12f deg yes Declination (DEC, J2000) at the image corner #4 (crpix1,crpix2 = -0.5,naxis2+0.5) for band 1.  
w2ra1 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #1 (crpix1,crpix2 = -0.5,-0.5) for band 2.  
w2dec1 %16.12f deg yes Declination (DEC, J2000) at the image corner #1 (crpix1,crpix2 = -0.5,-0.5) for band 2.  
w2ra2 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #2 (crpix1,crpix2 = naxis1+0.5,-0.5) for band 2.  
w2dec2 %16.12f deg yes Declination (DEC, J2000) at the image corner #2 (crpix1,crpix2 = naxis1+0.5,-0.5) for band 2.  
w2ra3 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #3 (crpix1,crpix2 = naxis1+0.5,naxis2+0.5) for band 2.  
w2dec3 %16.12f deg yes Declination (DEC, J2000) at the image corner #3 (crpix1,crpix2 = naxis1+0.5,naxis2+0.5) for band 2.  
w2ra4 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #4 (crpix1,crpix2 = -0.5,naxis2+0.5) for band 2.  
w2dec4 %16.12f deg yes Declination (DEC, J2000) at the image corner #4 (crpix1,crpix2 = -0.5,naxis2+0.5) for band 2.  
w3ra1 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #1 (crpix1,crpix2 = -0.5,-0.5) for band 3.  
w3dec1 %16.12f deg yes Declination (DEC, J2000) at the image corner #1 (crpix1,crpix2 = -0.5,-0.5) for band 3.  
w3ra2 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #2 (crpix1,crpix2 = naxis1+0.5,-0.5) for band 3.  
w3dec2 %16.12f deg yes Declination (DEC, J2000) at the image corner #2 (crpix1,crpix2 = naxis1+0.5,-0.5) for band 3.  
w3ra3 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #3 (crpix1,crpix2 = naxis1+0.5,naxis2+0.5) for band 3.  
w3dec3 %16.12f deg yes Declination (DEC, J2000) at the image corner #3 (crpix1,crpix2 = naxis1+0.5,naxis2+0.5) for band 3.  
w3ra4 %16.12f deg yes Right Ascension (RA, J2000) at the image corner #4 (crpix1,crpix2 = -0.5,naxis2+0.5) for band 3.  
w3dec4 %16.12f deg yes Declination (DEC, J2000) at the image corner #4 (crpix1,crpix2 = -0.5,naxis2+0.5) for band 3.  
w1wcdelt1 %21.18f deg/pix yes Degree per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 1 (x), band 1. See w1pxscal1 for the arcsec equivalent.  
w1wcdelt2 %21.18f deg/pix yes Degree per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 2 (y), band 1. See w1pxscal2 for the arcsec equivalent.  
w1uncrts1 %20.14e deg/pix yes The uncertainty in the image scale w1wcdelt1 for band 1.  
w1uncrts2 %20.14e deg/pix yes The uncertainty in the image scale w1wcdelt2 for band 1.  
w1pxscal1 %17.14f arcsec/pix yes Arcsecond per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 1 (x), band 1. See w1wcdelt1 for the degree equivalent.  
w1pxscal2 %17.14f arcsec/pix yes Arcsecond per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 2 (y), band 1. See w1wcdelt2 for the degree equivalent.  
w2wcdelt1 %21.18f deg/pix yes Degree per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 1 (x), band 2. See w2pxscal1 for the arcsec equivalent.  
w2wcdelt2 %21.18f deg/pix yes Degree per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 2 (y), band 2. See w2pxscal2 for the arcsec equivalent.  
w2uncrts1 %20.14e deg/pix yes The uncertainty in the image scale w2wcdelt1 for band 2.  
w2uncrts2 %20.14e deg/pix yes The uncertainty in the image scale w2wcdelt2 for band 2.  
w2pxscal1 %17.14f arcsec/pix yes Arcsecond per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 1 (x), band 2. See w2wcdelt1 for the degree equivalent.  
w2pxscal2 %17.14f arcsec/pix yes Arcsecond per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 2 (y), band 2. See w2wcdelt2 for the degree equivalent.  
w3wcdelt1 %21.18f deg/pix yes Degree per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 1 (x), band 3. See w3pxscal1 for the arcsec equivalent.  
w3wcdelt2 %21.18f deg/pix yes Degree per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 2 (y), band 3. See w3pxscal2 for the arcsec equivalent.  
w3uncrts1 %20.14e deg/pix yes The uncertainty in the image scale w3wcdelt1 for band 3.  
w3uncrts2 %20.14e deg/pix yes The uncertainty in the image scale w3wcdelt2 for band 3.  
w3pxscal1 %17.14f arcsec/pix yes Arcsecond per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 1 (x), band 3. See w3wcdelt1 for the degree equivalent.  
w3pxscal2 %17.14f arcsec/pix yes Arcsecond per pixel image scale at the reference position of the image (crpix1,crpix2) for axis 2 (y), band 3. See w3wcdelt2 for the degree equivalent.  
w1pa %18.13f deg yes The position angle of the positive image y-axis (axis2), East of North at the EQUINOX for band 1.  
w1uncrtpa %21.18f deg yes The uncertainty in the image position angle w1pa for band 1.  
w2pa %18.13f deg yes The position angle of the positive image y-axis (axis2), East of North at the EQUINOX for band 2.  
w2uncrtpa %21.18f deg yes The uncertainty in the image position angle w2pa for band 2.  
w3pa %18.13f deg yes The position angle of the positive image y-axis (axis2), East of North at the EQUINOX for band 3.  
w3uncrtpa %21.18f deg yes The uncertainty in the image position angle w3pa for band 3.  
w1skew %5.1f ---- yes The measurement of non-orthogonality of the image frame axes for band 1.  
w2skew %5.1f ---- yes The measurement of non-orthogonality of the image frame axes for band 2.  
w3skew %5.1f ---- yes The measurement of non-orthogonality of the image frame axes for band 3.  
w1cd1_1 %21.18f deg/pix yes CD (coordinate description) matrix element (1,1), encoding frame rotation and pixel scale for band 1.  
w1cd1_2 %21.18f deg/pix yes CD (coordinate description) matrix element (1,2), encoding frame rotation and pixel scale for band 1.  
w1cd2_1 %21.18f deg/pix yes CD (coordinate description) matrix element (2,1), encoding frame rotation and pixel scale for band 1.  
w1cd2_2 %21.18f deg/pix yes CD (coordinate description) matrix element (2,2), encoding frame rotation and pixel scale for band 1.  
w2cd1_1 %21.18f deg/pix yes CD (coordinate description) matrix element (1,1), encoding frame rotation and pixel scale for band 2.  
w2cd1_2 %21.18f deg/pix yes CD (coordinate description) matrix element (1,2), encoding frame rotation and pixel scale for band 2.  
w2cd2_1 %21.18f deg/pix yes CD (coordinate description) matrix element (2,1), encoding frame rotation and pixel scale for band 2.  
w2cd2_2 %21.18f deg/pix yes CD (coordinate description) matrix element (2,2), encoding frame rotation and pixel scale for band 2.  
w3cd1_1 %21.18f deg/pix yes CD (coordinate description) matrix element (1,1), encoding frame rotation and pixel scale for band 3.  
w3cd1_2 %21.18f deg/pix yes CD (coordinate description) matrix element (1,2), encoding frame rotation and pixel scale for band 3.  
w3cd2_1 %21.18f deg/pix yes CD (coordinate description) matrix element (2,1), encoding frame rotation and pixel scale for band 3.  
w3cd2_2 %21.18f deg/pix yes CD (coordinate description) matrix element (2,2), encoding frame rotation and pixel scale for band 3.  
bunit %20s ---- no Image pixel units: Data Number (DN) for intensity and uncertainty filetypes; the mask filetype is unitless. Image filetypes are described in section IV.4.a.  
w1modeint %10.3f DN yes The mode of the intensity pixel values within the partition with the lowest RMS in a 10 x 10 grid over the band 1 image.  
w2modeint %10.3f DN yes The mode of the intensity pixel values within the partition with the lowest RMS in a 10 x 10 grid over the band 2 image.  
w3modeint %10.3f DN yes The mode of the intensity pixel values within the partition with the lowest RMS in a 10 x 10 grid over the band 3 image.  
w1magzpunc %9.6f mag yes 1-sigma uncertainty in the photometric zero-point magnitude for the image, for band 1.  
w2magzpunc %9.6f mag yes 1-sigma uncertainty in the photometric zero-point magnitude for the image, for band 2.  
w3magzpunc %9.6f mag yes 1-sigma uncertainty in the photometric zero-point magnitude for the image, for band 3.  
unixt %16.5f sec no UNIX date-time in seconds of the mid-point of the frameset exposure, in UTC. The mid-point is defined as the time the optical boresight crosses the center of the WISE focal planes. This time is the same for all bands, whereas the exposure times in W1 and W2 are different than in W3.  
ephemt %16.6f sec no Ephemeris date-time in seconds of the mid-point of the frameset exposure, in UTC. The mid-point is defined as the time the optical boresight crosses the center of the WISE focal planes. This time is the same for all bands, whereas the exposure times in W1 and W2 are different than in W3.  
w1exptime %4.1f sec yes Single image frame exposure time in seconds for band 1; exposure times in W1 and W2 are different than in W3.  
w2exptime %4.1f sec yes Single image frame exposure time in seconds for band 2; exposure times in W1 and W2 are different than in W3.  
w3exptime %4.1f sec yes Single image frame exposure time in seconds for band 3; exposure times in W1 and W2 are different than in W3.  
tsamp %4.1f sec no The time interval between non-destructively read samples-up-the-ramp in on-board processing.  
w1l0file %200s ---- yes Corresponding level 0 image file name for band 1.  
w2l0file %200s ---- yes Corresponding level 0 image file name for band 2.  
w3l0file %200s ---- yes Corresponding level 0 image file name for band 3.  
dtanneal %18.11f sec no Elapsed time in seconds since the last anneal.  
utanneal %24s datetimeZ no The date and time of the last anneal, UTC.  
w1npn %2d ---- yes The number of different Point-Spread-Functions used in a grid over each image frame in band 1. These PSFs take into account the differences in distortion across the frames.  
w2npn %2d ---- yes The number of different Point-Spread-Functions used in a grid over each image frame in band 2. These PSFs take into account the differences in distortion across the frames.  
w3npn %2d ---- yes The number of different Point-Spread-Functions used in a grid over each image frame in band 3. These PSFs take into account the differences in distortion across the frames.  
nsrcall %7d---- no The number of sources from the source detection subsystem loaded into the photometry subsystem for the frameset.  
w1zero %7.3fmag no The photometric zero point magnitude for the Single-exposure image for band 1.  
w2zero %7.3fmag no The photometric zero point magnitude for the Single-exposure image for band 2.  
w3zero %7.3fmag no The photometric zero point magnitude for the Single-exposure image for band 3.  
w1rap_1 %6.3f arcsec yes The radius of circular aperture 1, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_1 %6.3f arcsec yes The radius of circular aperture 1, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_1 %6.3f arcsec yes The radius of circular aperture 1, in arcseconds, used for aperture photometry in band 3. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1rap_2 %6.3f arcsec yes The radius of circular aperture 2, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_2 %6.3f arcsec yes The radius of circular aperture 2, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_2 %6.3f arcsec yes The radius of circular aperture 2, in arcseconds, used for aperture photometry in band 3. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1rap_3 %6.3f arcsec yes The radius of circular aperture 3, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_3 %6.3f arcsec yes The radius of circular aperture 3, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_3 %6.3f arcsec yes The radius of circular aperture 3, in arcseconds, used for aperture photometry in band 3. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1rap_4 %6.3f arcsec yes The radius of circular aperture 4, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_4 %6.3f arcsec yes The radius of circular aperture 4, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_4 %6.3f arcsec yes The radius of circular aperture 4, in arcseconds, used for aperture photometry in band 3. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1rap_5 %6.3f arcsec yes The radius of circular aperture 5, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_5 %6.3f arcsec yes The radius of circular aperture 5, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_5 %6.3f arcsec yes The radius of circular aperture 5, in arcseconds, used for aperture photometry in band 3. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1rap_6 %6.3f arcsec yes The radius of circular aperture 6, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_6 %6.3f arcsec yes The radius of circular aperture 6, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_6 %6.3f arcsec yes The radius of circular aperture 6, in arcseconds, used for aperture photometry in band 3. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1rap_7 %6.3f arcsec yes The radius of circular aperture 7, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_7 %6.3f arcsec yes The radius of circular aperture 7, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_7 %6.3f arcsec yes The radius of circular aperture 7, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1rap_8 %6.3f arcsec yes The radius of circular aperture 8, in arcseconds, used for aperture photometry in band 1. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w2rap_8 %6.3f arcsec yes The radius of circular aperture 8, in arcseconds, used for aperture photometry in band 2. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w3rap_8 %6.3f arcsec yes The radius of circular aperture 8, in arcseconds, used for aperture photometry in band 3. The WISE aperture photometry was performed with a set of 8 fixed circular apertures, with radii of 5.5, 8.25, 11.0, 13.75, 16.5, 19.25, 22.0, and 24.75 arcseconds in bands 1, 2, and 3.  
w1stap %6.3f arcsec yes The radius in arcseconds of the standard circular aperture used for aperture photometry in band 1, nominally 8.25 arcseconds.  
w2stap %6.3f arcsec yes The radius in arcseconds of the standard circular aperture used for aperture photometry in band 2, nominally 8.25 arcseconds.  
w3stap %6.3f arcsec yes The radius in arcseconds of the standard circular aperture used for aperture photometry in band 3, nominally 8.25 arcseconds.  
ntable %7d---- no The total number of sources extracted in the photometry subsystem in the Single-exposure image frameset.  
nwpro_adb %7d---- no The number of sources in the frameset which were actively deblended before performing profile-fit photometry.  
npro_nbad %7d ---- no The number of sources in the frameset whose profile fitting photometry failed with an uncertainty value less than 0.0.  
w1n3sig %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 for band 1.  
w2n3sig %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 for band 2.  
w3n3sig %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 for band 3.  
w1n3sig_only %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 in band 1 only.  
w2n3sig_only %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 in band 2 only.  
w3n3sig_only %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 in band 3 only.  
n12 %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 in bands 1 and 2.  
n13 %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 in bands 1 and 3.  
n23 %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 in bands 2 and 3.  
n123 %7d ---- yes The number of sources in the frameset whose profile-fit photometry have SNR > 3 in bands 1, 2 and 3.  
nrchi_0_05 %7d ---- no The number of sources in the frameset whose profile-fit photomery have rchi2 values between 0 and 0.5.  
nrchi_05_2 %7d ---- no The number of sources in the frameset whose profile-fit photomery have rchi2 values between 0.5 and 2.  
nrchi_2_5 %7d ---- no The number of sources in the frameset whose profile-fit photomery have rchi2 values between 2 and 5.  
nrchi_5_15 %7d ---- no The number of sources in the frameset whose profile-fit photomery have rchi2 values between 5 and 15.  
nrchi_15 %7d ---- no The number of sources in the frameset whose profile-fit photomery have rchi2 values greater than 15.  
nblend_1 %7d ---- no The number of sources in the frameset which were not deblended before performing profile-fit photometry.  
nblend_2 %7d ---- no The number of sources in the frameset which were actively deblended into 2 individual sources.  
nblend_3 %7d ---- no The number of sources in the frameset which were actively deblended into 3 individual sources.  
nblend_4 %7d ---- no The number of sources in the frameset which were actively deblended into 4 individual sources.  
nblend_5 %7d ---- no The number of sources in the frameset which were actively deblended into 5 or more individual sources.  
w1n_rdiff %6d ---- yes The number of real sources which are flagged as contaminated by diffraction spikes in band 1.  
w2n_rdiff %6d ---- yes The number of real sources which are flagged as contaminated by diffraction spikes in band 2.  
w3n_rdiff %6d ---- yes The number of real sources which are flagged as contaminated by diffraction spikes in band 3.  
w1n_rlshort %6d ---- yes The number of real sources which are flagged as contaminated by short-term latents in band 1.  
w2n_rlshort %6d ---- yes The number of real sources which are flagged as contaminated by short-term latents in band 2.  
w3n_rlshort %6d ---- yes The number of real sources which are flagged as contaminated by short-term latents in band 3.  
w3n_rlldsresist %6d ---- yes The number of real sources affected by long-term latents which cannot be corrected by DYNASKY in band 3.  
w3n_rllong %6d ---- yes The number of real sources which are flagged as contaminated by long-term latents in band 3.  
w1n_rhalo %6d ---- yes The number of real sources which are flagged as contaminated by halos in band 1.  
w2n_rhalo %6d ---- yes The number of real sources which are flagged as contaminated by halos in band 2.  
w3n_rhalo %6d ---- yes The number of real sources which are flagged as contaminated by halos in band 3.  
w1n_roghost %6d ---- yes The number of real sources which are flagged as contaminated by optical ghosts in band 1.  
w2n_roghost %6d ---- yes The number of real sources which are flagged as contaminated by optical ghosts in band 2.  
w3n_roghost %6d ---- yes The number of real sources which are flagged as contaminated by optical ghosts in band 3.  
w1n_rglint %6d ---- yes The number of real sources which are flagged as contaminated by glints in band 1.  
w2n_rglint %6d ---- yes The number of real sources which are flagged as contaminated by glints in band 2.  
w3n_rglint %6d ---- yes The number of real sources which are flagged as contaminated by glints in band 3.  
w1n_sdiff %6d ---- yes The number of sources which are flagged as spurious detections of diffraction spikes in band 1.  
w2n_sdiff %6d ---- yes The number of sources which are flagged as spurious detections of diffraction spikes in band 2.  
w3n_sdiff %6d ---- yes The number of sources which are flagged as spurious detections of diffraction spikes in band 3.  
w1n_slshort %6d ---- yes The number of sources which are flagged as spurious detections due to short-term latents in band 1.  
w2n_slshort %6d ---- yes The number of sources which are flagged as spurious detections due to short-term latents in band 2.  
w3n_slshort %6d ---- yes The number of sources which are flagged as spurious detections due to short-term latents in band 3.  
w3n_slldsresist %6d ---- yes The number of sources flagged as spurious detections due to long-term latents which cannot be corrected by DYNASKY in band 3.  
w1n_shalo %6d ---- yes The number of sources which are flagged as spurious detections of halos in band 1.  
w2n_shalo %6d ---- yes The number of sources which are flagged as spurious detections of halos in band 2.  
w3n_shalo %6d ---- yes The number of sources which are flagged as spurious detections of halos in band 3.  
w1n_soghost %6d ---- yes The number of sources which are flagged as spurious detections of optical ghosts in band 1.  
w2n_soghost %6d ---- yes The number of sources which are flagged as spurious detections of optical ghosts in band 2.  
w3n_soghost %6d ---- yes The number of sources which are flagged as spurious detections of optical ghosts in band 3.  
w1n_rtot %6d ---- yes The total number of real sources which are flagged as contaminated by artifacts in band 1.  
w2n_rtot %6d ---- yes The total number of real sources which are flagged as contaminated by artifacts in band 2.  
w3n_rtot %6d ---- yes The total number of real sources which are flagged as contaminated by artifacts in band 3.  
n_rtot %6d ---- no The total number of real sources which are flagged as contaminated by artifacts in any band.  
w1n_stot %6d ---- yes The total number of sources which are flagged as spurious detections of artifacts in band 1.  
w2n_stot %6d ---- yes The total number of sources which are flagged as spurious detections of artifacts in band 2.  
w3n_stot %6d ---- yes The total number of sources which are flagged as spurious detections of artifacts in band 3.  
n_stot %6d ---- no The total number of sources which are flagged as spurious detections of artifacts in any band.  
rbovera %6.4f ---- no The axial ratio of the calculated frame PSF for the lowest band available.  
noisepix %9.3f pix no The effective number of noise pixels in the calculated frame PSF for the lowest band available.  
r_mean_20 %6.3f arcsec yes The mean radial separation of all the WISE-2MASS source associations in the frame having WISE w1snr ≥ 20.  
qual_frame %2d ---- no This integer indicates the quality score value for the Single-exposure image frameset, with values of 0 (poor quality), 5, or 10 (high quality). The value is determined by the minimum of the quality factors qc_fact, qn_fact, and qi_fact, multiplied by ten.  
qc_fact %3.1f ---- no This quality factor gauges the quality of completion of the Single-exposure image frameset. If the status value from the processing pipeline was equal to 0 (indicating a problem-free completion), then qc=1.0. Otherwise, qc=0.0 because the frameset failed to complete processing. All framesets in the Database have received qc values of 1.0.  
qi_fact %3.1f ---- no This quality factor gauges the image shape quality of the Single-exposure image frameset. It checks for potential image smearing by using the axial ratio of the PSF calculated from a subset of sources in the frameset. The value of qi is 1.0 if the axial ratio b/a > 0.60; otherwise it is 0.0.  
qn_fact %3.1f ---- no This quality factor indicates the background and noise characteristics quality of the Single-exposure frameset.  
qa_fact %3.1f ---- no This quality factor gauges the astrometric quality. If the standard deviation of WISE positions with respect to the 2MASS Point Source Catalog positions is < 0.5 arcsec on each axis (or 0.71 arcsec RSS), for sources having SNR > 20 in at least one band, then qa=1.0. Otherwise, qa=0.0.  
qual_scan %2d ---- no This integer indicates the quality score value for the scan containing the Single-exposure image frameset, with values of 0 (poor quality), 5, or 10 (high quality). The value is determined by the minimum of the quality factors qs1_fact, qs5_fact, and qp_fact, multiplied by ten.  
qs1_fact %3.1f ---- no This quality factor indicates the quality of scan synchronization as judged from the overall 1x1 PSF grid computed by the PSF Moments routine and evaluated based on the effective number of noise pixels.  
qs5_fact %3.1f ---- no This quality factor indicates the quality of scan synchronization as judged from the overall 5x5 PSF grid computed by the PSF Moments routine and evaluated based on the effective number of noise pixels.  
qp_fact %3.1f ---- no This quality factor indicates the scan photometric quality. If the scan's photometric zero-point offset computed using profile-fit photometry (pzp) falls within a certain range about 0, the value of qp_fact is 1.0; otherwise it is 0.0.  
cntr %12d ---- no Unique sequential identification number for the metadata table entry.  
x %19.16f ---- yes Unit sphere (x,y,z) position x value  
y %19.16f ---- yes Unit sphere (x,y,z) position y value  
z %19.16f ---- yes Unit sphere (x,y,z) position z value  
spt_ind %9d ---- yes HTM spatial (x,y,z) index key  


Last Updated: 2012 July 26


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