QC documentation system: QC procedure QCocam_dome.py for OMEGACAM

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QCocam_qcheck.py QCocam_shutter.py QCocam_readnoise.py QCocam_lingain.py
QCocam_bias.py QCocam_dark.py QCocam_dome.py QCocam_flat.py
QCocam_std.py QCocam_sci.py
 
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NAME QCocam_dome.py
VERSION 1.0 -- 2012-06-10 First draft of this QC report
SYNTAX Python
CALL measureQuality of data contained in $DFS_PRODUCT/DOME/$DATE
within processQC: processQC -a $AB
explicit call: QCocam_dome.py -a [$AB_name] -e [$ext_number: 1-32] -i [$level_of_interaction: 0-2]
INSTRUMENT OMEGACAM
RAWTYPE DOME (DPR.TYPE = FLAT,DOME)
PURPOSE a) generates 3 QC reports for each OmegaCAM CCD
b) writes QC1 parameters into local QC1 database omegacam_dome
PROCINPUT No input is required:
a) $DATE is read from AB
b) the primary file is set in QCocam_dome.py and is the PRO.CATG=MASTER_FLAT_DOME product with the _0000.fits extension.
c) raw frames are implicitly read from the AB.
d) All reference products: MASTER_FLAT_DOME and COLD_PIXELS_MAP, are found and read in from $DFO_ROOT_DIR_FC/calib/references/DOME/.
QC1TABLE trending | table(s) in QC1 database:
omegacam_dome
TRENDPLOT trending | HealthCheck plot(s) associated to this procedure:
trend_report_DOME_raw_rSDSS_HC.html
QC1PAGE trending | associated documentation:
dome_QC1.html
QC1PLOTS
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dome1.png
display each of 32 MASTER_FLAT_DOME frames on ds9 display.

dome2.png
display each of 32 COLD_PIXELS_MAP frames on ds9 display. Note that cold pixels have a value of 1. Normal pixels = 0.

dome3.png
left: full-field image of the master dome flat of the extension listed at the top of the image
center left: 4x zoom of the center area of the master dome flat
center right: the difference of the reference master dome flat and the current master dome flat frames
The median level of the difference image is listed to the right of the frame
right: full-field image of the cold pixels map. The positions of the reference frame cold pixels are shown
in red, while the cold pixels of the current dome flat frame are shown in blue. The total numbers of cold pixels are listed
in the frame legend.

dome4.png
top left: a) three single column traces of the current and reference master dome flats through:
x = 256 (dark grey)
x = 1024 (middle grey)
x = 1792 (light grey)
b) average of all columns (normalized) of current master dome flat (thick blue line)
c) average of all columns (normalized) of reference master dome flat (thick red line)
top center: a) three single row traces of the current and reference master dome flats through:
y = 256 (dark grey)
y = 2048 (middle grey)
y = 3840 (light grey)
b) average of all rows (normalized) of current master dome flat (thick blue line)
c) average of all rows (normalized) of reference master dome flat (thick red line)
top right: a) logarithmic histogram of current master dome flat (blue line)
b) logarithmic histogram of reference master dome flat (red line)
The median levels (as computed from a Gaussian fit) are shown as vertical dashed lines and listed in the legend
lower left: difference between the average column traces of the reference and current master dome flat frames
lower center: difference between the average row traces of the reference and current master dome flat frames
In both plots, the zero line is shown in orange as a reference.
lower right: logarithmic histogram of the difference between the reference and current master dome flat frames.
Ideally, the histogram should straddle the zero line (shown in orange).
The median difference (as computed from a Gaussian fit) is shown as vertical dashed green line.

dome5.png
left: full-field image of the first raw dome flat executed in the template
center: full-field image of the last raw dome flat executed in the template
top right: a) six single column traces of the current raw dome flats through:
x = 256 (dark grey) for the first and last raw domes
x = 1024 (middle grey) for the first and last raw domes
x = 1792 (light grey) for the first and last raw domes
b) average of all columns of the first raw dome flat (thick red line)
c) average of all columns of the last raw dome flat (thick blue line)
bottom right: a) six single row traces of the current raw dome flats through:
x = 256 (dark grey) for the first and last raw domes
x = 1024 (middle grey) for the first and last raw domes
x = 1792 (light grey) for the first and last raw domes
b) average of all rows of the first raw dome flat (thick red line)
c) average of all rows of the last raw dome flat (thick blue line)
QC1PARAM QC1 parameters written into QC1 table(omegacam_dome) 
SOURCE(header or script)   DBNAME                  value       description

 PRO.DATANCOM             datancom                 5           the number of raw files combined in pipeline processing
 QC.MASTER.DOME.MEDIAN    qc_dome_median           1.003423    the median counts in the normalized master dome flat (ADU)
 QC.MASTER.DOME.MEAN      qc_dome_mean             0.987343    the mean counts in the  normalized master dome flat (ADU)
 QC.MASTER.DOME.STDEV     qc_dome_std              0.034223    the standard deviation of the normalized master dome flat (ADU)
 QC.NUMBER.COLD.PIXELS    qc_dome_cold_pixels      3564        the number of cold pixels
 QC.RAW.DOME.MIN          qc_raw_dome_min          8567.54     the median flux level of the input raw dome having the minimum average flux level (ADU)
 QC.RAW.DOME.MAX          qc_raw_dome_max          28567.54    the median flux level of the input raw dome having the maximum average flux level (ADU)
 QC.RAW.DOME.MEAN         qc_raw_dome_mean         18567.54    the mean flux level of all the input raw dome flats (ADU)
 QC.RAW.DOME.MEDIAN       qc_raw_dome_median       17567.54    the median flux level of all the input raw dome flats (ADU)
 QC.RAW.DOME.STDEV        qc_raw_dome_std          450.23      the standard deviation of the flux level of all the input raw dome flats (ADU)
 QCocam_dome.py           qc_temp_mosaic_plate     146.6       the average temperature probe of the mosaic plates from DET.TLM5/8 (QC script)
ALGORITHM Description of algorithms:
qc_dome_median: the master dome frame is created from 5 input, screen flat exposures (each with >20,000 ADU flux levels), are bias-corrected, and averaged together with a 5 sigma rejection of outliers (intended to reduce photon shot noise and to remove cosmic rays. This QC parameter is the median level of the full master dome flat frame.
qc_dome_mean: the mean of the full master dome flat frame.
qc_dome_std: the standard deviation of the full master dome flat frame.
qc_dome_cold_pixels the total number of cold pixels flagged in the master dome flat frame.
qc_raw_dome_min: the median flux level of the input raw dome having the minimum average flux level (ADU). This QC parameter is used to ensure that the weakest dome flat has enough flux to create a statistically accurate master dome flat.
qc_raw_dome_max: the median flux level of the input raw dome having the largest average flux level (ADU). This QC parameter is used to ensure that the dome flat with the most flux does not reach the saturation limits of the detector.
qc_raw_dome_mean/median/std: the statistics (mean, median, and standard deviation) of all input raw dome flats (ADU).
CERTIF - Since the master dome flat produced by the OmegaCAM pipeline is normalized, it is not easy to detect whether or not one of the input dome flat frames was either saturated or had insufficient flux. For this reason, the raw dome flat statistics are monitored. QC report #3 will clearly show a saturated raw dome, or a raw dome with too little flux. Both parameters are scored.
- A saturated dome flat should be rejected and reported to Paranal.
- It may also happen that dome flat flux levels are very low (i.e. <1000 ADU). The source of this may be that the M1 covers were in place during the exposure, or that the dome flat lamp was not turned on. These dome flats should be rejected and reported to Paranal.
Finally, since the dome flat lamp is very red, the dome flats made with the u_SDSS, the u-band quadrant of the u_g_r_i_SDSS, and even the B_JOHN filters can have very low flux levels. This has to be tolerated as there is no alternative dome flat lamp.
COMMENTS OmegaCAM dome flat frames are normally taken daily and consist of 5 raw, filter-specific screen flats.
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