QC documentation system: QC procedure bias_blue.prg for UVES

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bias_blue.prg bias_red.prg dark_blue.prg dark_red.prg zeroflat.prg
fmtcheck_blue.prg fmtcheck_red.prg orderdef_blue.prg orderdef_red.prg flat_blue.prg flat_red.prg wave_blue.prg wave_red.prg
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NAME bias_blue.prg
VERSION 2.3
SYNTAX MIDAS
CALL from $DFS_PRODUCT/BIAS_BLUE/$DATE:
 uves.MeasureQuality -a <AB> -c bias_blue.prg [-i|--NOingestQC1pars]
 where
  • <AB> is the Association Block
    •
  • [-i] forces QC1 parameter ingestion (default)
    •
  • [--NOingestQC1pars] prevents QC1 parameter ingestion
    •
INSTRUMENT UVES
RAWTYPE BIAS_BLUE
PURPOSE Comparison of raw, master and reference BIAS files for UVES QC assessment; QC1 values are read from the PRODUCTS and some are calculated and fed into the QC1 table. QC1 plot(s) and/or display(s) are generated, and later reviewed within certifyProducts.
The generated plots stored in $DFO_PLT_DIR/$DATE with the name r.<DPid>_tpl_0000.fits.png where <DPid> is the Data Product Identification of the first frame of the template.
PROCINPUT first raw BIAS from AB; MASTER_BIAS product; REF_BIAS
QC1TABLE trending | table(s) in QC1 database:
uves_bias
TRENDPLOT trending | HealthCheck plot(s) associated to this procedure:
HEALTH/trend_report_BIAS_median_DHC_HC.html
QC1PAGE trending | associated documentation:
bias_qc1.html
QC1PLOTS
top

bias_blue.montage.png
A montage image made up of the following individual reports simply for the purposes of easier/better display in XV during the certification process. Created together with the reference montage (see below) within the uves.MeasureQuality script. Can be recreated manually by calling the script uves.makeQCreportMontage -a <AB>, see uves.makeQCreportMontage -h for more details.
bias_blue.montage.ref.png
A montage image made up from the individual QC reports of the reference AB located by the script uves.getRefAB. During certification, the two montage images are blinked to facilitate identification of unusual features. This reference montage created at the same time as the AB montage (see above). The montage of the reference AB is easily identified during the blinking as the one with the grey background.
bias_blue_0000.fits.png
box 1: comparison master (red) <-> raw (black); middle row and middle column, full pixel range, in ADU
box 2: comparison master (red) <-> raw (black), expansion in x; middle row and middle column, central 100 pixels, in ADU
box 3: ratio master/reference; central row for all columns (black) in ADU; central column for all rows (green) in ADU, offset for clarity by +0.10
box 4: ratio master/reference; central row for central 100 columns (black) in ADU; central column for central 100 rows (green) in ADU, offset for clarity by +0.10
box 5: histogram: all pixel values in log frequency histogram; raw: black, master: red; there should be a dominant peak with Gaussian shape (which translates to parabola shape in this log freq diagram)
box 6: structure description; all columns and all rows are collapsed and then all rows (top) and all columns (bottom, offset by -0.10 for clarity) are displayed;
top panel: name of analyzed master bias frame, along with the name of the first RAW, the reference used etc
bottom panel: some QC1 parameters (median_master; raw RON, master RON, expected RON=raw/sqrt(5), structure parameters)

bias_blue_0000.fits_1.ima.png
full display of raw frame
bias_blue_0000.fits_2.ima.png
full display of master frame (box: area to be displayed in bias_blue_0000.fits_3.png)
bias_blue_0000.fits_3.ima.png
closeup display of master frame
bias_blue_0000.fits_4.ima.png
full display of master frame minus reference frame
QC1PARAM QC1 parameters written into QC1 table:
QC1db names: median_master | sigma_raw | sigma_master | struct_row | struct_col | mean_ratio_ref | sigma_ratio_ref
FITS key names: PRO.DATAMED | QC.OUT1.RON.RAW | QC.OUT1.RON.MASTER | QC.OUT1.STRUCTX | QC.OUT1.STRUCTY | <qc_script> | <qc_script>
QC1 params created by pipeline: median_master | sigma_raw | sigma_master | struct_row | struct_col
QC1 params created by this procedure: mean_ratio_ref | sigma_ratio_ref
ALGORITHM Description of algorithms:
Algorithms for pipeline created keywords are (in principal) described in the pipeline user's manual
  • median_master: median value of master bias, product keyword PRO.DATAMED
    Description: Exact median of the pixel values in the frame. All pixels are taken into account.
  • sigma_raw: RON value of first raw frame, product keyword QC.OUTi.RON.RAW
    Description: Read noise frame in ADU
  • sigma_master: RON value of master bias, product keyword QC.OUTi.RON.MASTER
    Description: Read noise frame in ADU
  • struct_row: structure in X direction, product keyword QC.OUTi.STRUCTX
    Description: Evidence of any possible structure in bias. To have more details on a bias image without saving the full image we collapse it along X or Y and compute the standard deviation of the corresponding point distribution. This is the STRUCTX/Y. A large or suddenly changed value of the structure is indication of some problem on the axis ortogonal to the direction of collapsation.
  • struct_col: structure in Y direction, product keyword QC.OUTi.STRUCTY
    Description: Evidence of any possible structure in bias. To have more details on a bias image without saving the full image we collapse it along X or Y and compute the standard deviation of the corresponding point distribution. This is the STRUCTX/Y. A large or suddenly changed value of the structure is indication of some problem on the axis ortogonal to the direction of collapsation.
  • mean_ratio_ref: ratio to reference frame, this QC parameter is currently calculated by the QC report script, not by the pipeline, MIDAS keyword mean_ref.
    Description: The ratio image rel_ref to the reference is computed by a simple division of the MASTER by the REFERENCE, mean_ratio_ref is then computed as the mean value (i.e. outputr(3)) returned by the following MIDAS command: 
     stat/ima rel_ref + exc={lower_ref},{upper_ref} bins=0.001 option=S
    lower_ref and upper_ref are hardwired in the script to 0.9 and 1.1 respectively.
  • sigma_ratio_ref: sigma of mean_ratio_ref, this QC parameter is currently calculated by the QC report script, not by the pipeline, MIDAS keyword sig_ref.
    Description: sig_ref is the standard deviation (i.e. outputr(4)) multiplied by 1000. of the same stat/ima command computed for mean_ratio_ref
CERTIF Reasons for rejection:
- unusually high bias level or RON level (unless representative);
- unusual structure (compare panel 2 plots with older/reference version);
- non-parabolic shape of histogram;
- DATANCOM lower than usual (5), especially if N=5 version nearby in time
The closeup displays are useful to check for patterns (e.g. pickup noise) which should not be there.
COMMENTS Temperature monitoring pending.
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