Vis Master Bias Frame Product¶
Data product name¶
DpdVisMasterBiasFrame
Data product custodian¶
Name of the Schema file¶
euc-vis-MasterBiasFrame.xsdData product elements¶
- Header:
object of type sys:genericHeader
- Data:
object of type vis:visMasterBiasFrame
- QualityFlags:
object of type dqc:sqfPlaceHolder
- Parameters:
object of type ppr:genericKeyValueParameters
Schema documentation tag¶
emphasis:Documentation for data product element DpdVisMasterBiasFrame:
Master Bias is the offset of each pixel relative to the pedastal
Documentation for data product element Header:
The generic header of the product.
Processing Element(s) creating/using the data product¶
Final data product of the Master Bias Calibration pipeline Used by Bias Correction tasks in several pipelines: (ProcessField, LargeFlat, CTI, DistortionModel, PRNU Small Scale Flat, NonLinearity, BrighterFatter, XTalk)
Processing function using the data product¶
VIS
Detailed description of the data product¶
Master Bias Calibration Pipeline result, using a series of bias calibration exposures to calculate a MasterBias to be used in other ou-vis pipelines.
Master Bias is the offset of each pixel relative to the pedastal . Pedastal is constant offset per quadrant added by the electronics.
Used by Bias Correction tasks in several pipelines: (ProcessField, LargeFlat, CTI, DistortionModel, PRNU Small Scale Flat, NonLinearity, BrighterFatter, XTalk)
A rectangular region is used to measure the pedestal of each frame. That is subtracted from each frame before they are combined. start-end measuring the main bias offset level. CCD pixel columns and lines are numbered 0 to N-1, relative to the readout node, so that the same values are appropriate for all quadrants. This means that [0,0] is the first pixel to be read out. Start and end values are both inclusive. NOTE that this is DIFFERENT from the convention used in FITS files, which relates to the physical X,Y axes of the focal plane.” main_bias_col_start = 2104 main_bias_col_end = 2127 main_bias_line_start = 2070 main_bias_line_end = 2085
Each pixel is the sigma-clipped mean of the value of that pixel in all the frames.
The final product will be 144 extensions based on the quadrants identified by the EXTNAME, which is a combination of CCDID (CCD-Row then CCD-Column) and QuadrantID i.e. 2.3-H, size of quadrant images 2128x2086 pixels in ADU units.
Primary Header:
SIMPLE |
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BITPIX |
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NAXIS |
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EXTEND |
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OBSTYPE |
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ToFill |
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N_CCD |
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ToFill |
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EXPTIME |
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Commanded integration time in seconds, e.g. 565.0 |
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DATAUNIT |
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ToFill |
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RA |
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Commanded FPA pointing right ascension (deg) |
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DEC |
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Commanded FPA pointing declination (deg) |
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INSTRUME |
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VIS instrument |
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SEQID |
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VIS sequences as defined in EUCL-IFS-ICD-6-002 VIS Data ICD |
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ORIENTAT |
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ToFill |
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DATE |
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UT date when this file was created |
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DATE-OBS |
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UTC Date of observation (start), e.g. ‘2014-03-15T09:30:09.313’ |
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VERSION |
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END |
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Extension Header:
XTENSION |
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BITPIX |
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NAXIS |
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NAXIS1 |
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NAXIS2 |
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PCOUNT |
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GCOUNT |
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TIMESYS |
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Time scale of the time-related keywords |
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DATE |
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UT date when this file was created |
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MJDATE |
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MJD start time, e.g. 56731.39594113 |
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WCSAXES |
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Number of coordinate axes |
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CRPIX1 |
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Reference pixel x coordinate |
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CRPIX2 |
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Reference pixel y coordinate |
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CRVAL1 |
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Right ascension at ref pixel |
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CRVAL2 |
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Declination at ref pixel |
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CTYPE1 |
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Coordinamte 1 type |
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CTYPE2 |
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Coordinamte 2 type |
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RA |
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Commanded FPA pointing right ascension (deg) |
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DEC |
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Commanded FPA pointing declination (deg) |
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CD1_1 |
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Translation matrix element |
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CD1_2 |
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Translation matrix element |
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CD2_1 |
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Translation matrix element |
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CD2_2 |
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Translation matrix element |
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EXTNAME |
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Format: CCD row-CCD column.quadrant id, e.g. 2.3-H |
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INSTRUME |
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VIS instrument |
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EXPTIME |
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Commanded integration time in seconds, e.g. 565.0 |
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DETECTOR |
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ToFill |
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GAIN |
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Maximum equivalent gain (e-/ADU) |
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RDNOISE |
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Read out Noise |
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QE |
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Quantum Efficiency |
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DC |
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ToFill |
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PIXSIZE |
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ToFill |
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PIXSCALE |
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ToFill |
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CCDID |
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e.g. Detector ID and quad, e.g. 1-1.H’ … ‘6-6.E’ |
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QUADID |
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e.g. Quadrant ID, e.g. ‘E’, ‘F’, ‘G’ or ‘H’ |
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PRESCANX |
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number of serial prescan pixels, e.g 51 |
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OVRSCANX |
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number of serial overscan pixels, e.g 20 |
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DETSEC |
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ToFill |
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ASEC |
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ToFill |
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DSEC |
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ToFill |
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TSEC |
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ToFill |
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BSEC |
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ToFill |
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CSEC |
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ToFill |
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MAXLIN |
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ToFill |
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SATURATE |
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Saturation Level (ADU) |
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NON_LIN |
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ToFill |
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RON_STD |
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ToFill |
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BIAS_LVL |
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Bias Level |
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ADC_MAX |
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ToFill |
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PC1_1 |
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Coordinate transformation matrix element |
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PC1_2 |
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Coordinate transformation matrix element |
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PC2_1 |
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Coordinate transformation matrix element |
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PC2_2 |
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Coordinate transformation matrix element |
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CDELT1 |
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[deg] Coordinate increment at reference |
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CDELT2 |
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[deg] Coordinate increment at reference |
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CUNIT1 |
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Physical units of CRVAL1 |
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CUNIT2 |
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Physical units of CRVAL2 |
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LONPOLE |
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[deg] Native longitude of celestial pol |
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LATPOLE |
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[deg] Native latitude of celestial pole |
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RADESYS |
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Astrometric system |
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DATE-OBS |
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UTC Date of observation (start), e.g. ‘2014-03-15T09:30:09.313’ |
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CHECKSUM |
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HDU checksum updated 2018-11-15T12:07:22 |
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DATASUM |
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data unit checksum updated 2018-11-15T12:07:22 |
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NBIAS |
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Number of Bias Frames |
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COMBMETH |
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Combination Method Used |
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NORMMETH |
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Normalisation Method |
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END |
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