.. _VISCalibratedQuadFrame: ================================= Vis Calibrated Quad Frame Product ================================= Metadata ______________________ +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Data product name | DpdVisCalibratedQuadFrame | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Data product custodian | VIS | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Name of the Schema file | .. raw:: html | | | | | | `euc-vis-CalibratedQuadFrame.xsd `_ | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Processing Element(s) creating/using the data | VIS_science_xml_out | | product | | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Processing function using the data product | SHE and MER processing functions. | +------------------------------------------------+----------------------------------------------------------------------------------------------+ Proposed for inclusion in EAS/SAS ========================================== .. PFUsingStart Yes .. PFUsingEnd Data product elements ===================== +--------------+----------------------------------------------+ | Header | object of type sys:genericHeader | +--------------+----------------------------------------------+ | Data | object of type vis:visCalibratedQuadFrame | +--------------+----------------------------------------------+ | QualityFlags | object of type dqc:sqfDpdCalibratedFrame | +--------------+----------------------------------------------+ | Parameters | object of type ppr:genericKeyValueParameters | +--------------+----------------------------------------------+ Detailed description of the data product ======================================== .. DetailedDescStart The VIS processing function provides a CalibratedQuadFrame product consisting of 3 FITS files per exposure: a **calibrated VIS individual exposure**, and the corresponding **Background map** and **Weight map**. A PSF file is also provided. This corresponds to the PSF part of the :ref:`VisPSFModel`. In all products, pixels are delivered at the native pixel scale and all extensions have the same pixel scale and size. Pixel data is in 32-bit floating point format. The unit of the pixel is ADU for all products. To convert the image to electrons you need to multiply it by the GAIN, which is expressed in e-/ADU. To convert the image into mJy, you need to use .. math:: :nowrap: \begin{aligned} m_{AB} &= -2.5 \log_{10}(ADU) + Z_p + 2.5 \log_{10}(t_{\text{exp}}) \\ S_{mJy} &= 10^{\frac{23.9 - m_{AB}}{2.5}} \end{aligned} Some exposures cannot be used for scientific purposes, or can only be used with certain precautions. These include exposures affected by stray light, X-rays, or guidance errors. For selected useful data, some metrics are included in the **.xml** file that follows each FITS file. See the :ref:`VisAnalysisResults` for how to interpret these metrics. Changes introduced by the PF version ------------------------------------ PF 14.0 ******* * This data product is added in replacement of DpdVisCalibratedFrame. * Flags definition changes. * Contents of VIS Noise map updated. * Invalidate quadrants which contain too many cosmic rays. * Add PSF statistics and quality plots. PF 15.0 ******* * Flags definition changes. * Quadrants containing too many cosmic rays are not invalidated. * New FITS keyword COSMICPC containing the percentage of COSMIC flagged pixels in extension. * Astrometry: if pointing reconstruction fails, use commanded pointing instead of crashing, set PTG_RECD to false and DpdVisCalibratedQuadFrame.Header.AutomatedValidationStatus set to INVALID. PF 17.0 ******* * No major change in this product. PF 18.0 ******* * New CR detection with the stack based methode. Only the flag map and weight map is updated after this detection, not the catalogue. * Adjust parameter in NoiseChisel PF 18.1 ******* * Improved version of StackCRFlagging * Correct blooming threshold Calibrated VIS individual exposure ---------------------------------- The calibrated VIS individual exposure is a multi-extension FITS file containing 3 extensions per quadrant, one for pixel data, one for the associated RMS map and one for the associated Flagmap, making 432 extensions for the full 144 quadrants which constitutes an exposure. Each extension contains the keyword **EXTNAME**, which is **.SCI**, **.RMS** or **.FLG** for Science, RMS map and Flagmap respectively. The “detector id” describes the extension following the scheme given in the VIS FPA ICD (EUCL-SAP-ICD-6-001). **Name of file:** ``EUC_VIS_SWL_DET-[ObsId]-[Dither]-[exposure]-0000000__[YYYYMMDDThhmmss.s]Z.fits.gz`` where the date is the production date. SCI extension ************* The SCI extension contains calibrated pixel data for each of the VIS instrument quadrants. The individual images contain both an astrometric and photometric solution written in the FITS header. No flux scaling is applied, but the results of the photometric solution computed by VIS are written in the FITS header keywords. The images are not background subtracted, but a background map is provided as a FITS file with the same pixel size as the individual images. The astrometric solution is described as a PV projection. Images are not resampled and are delivered at the native VIS pixel scale (which of course means that the optical distortion of the instrument is still present). WCSFITS is used to compute the astrometric solution. It uses a :ref:`DpdVisDistortionModel` of the FPA to compute the astrometric solution (pointing and position angle). The pointing position is the centre of rotation of the FOV and is defined as the centre of the VIS FPA. .. figure:: images/CCD_numbering.png :scale: 50 % :align: center :figclass: align-center : CCD numbering and location at detector plane level (Front view) from VIS FPA ICD (EUCL-SAP-ICD-6-001) issue 2.5 2014/20/10 RMS extension ************* The RMS map contains the noise at each pixel in the corresponding Science image, expressed as the absolute standard deviation and is the one to use for photometry. It is calculated from the quadratic sum of the signal (background+objects in the science image) plus the readout noise. Please note that the RMS map is not flagged/masked; it contains the invalid pixel values. .. note:: In the first PF version (before PF 14.0), RMS map was the BACKGROUND_RMS SExtractor checkimage. These maps are generated by calculating the standard deviation of pixels in a sliding window on the input images, after object removal. FLG extension ************* Flagmap define if a pixel is usable for science or not. The Flagmap definition is presented in :ref:`VisFlagMap` in a human readable format. Unusable pixel are affected by the flag INVALID (flag value 1). Therefore, all odd pixels must not be used. .. important:: If more than 5% of pixels in a quadrant are identified as cosmic ray, the entire quadrant is flag with CR_REGION (flag value 512). However CR_REGION is not part of INVALID flag. For scientific analysis, it is recommended to manually exclude quadrants marked with this flag. Data Header *********** ======== ================================================================ Key Primary Header ======== ================================================================ SIMPLE file does conform to FITS standard BITPIX number of bits per data pixel NAXIS number of data axes EXTEND FITS dataset may contain extensions FITS_DEF FITS definition name FITS_VER FITS definition version TIMESYS Time scale of the time-related keywords PLAN_ID 32-bit SOC Operation ID BUNIT Pixel data unit, e.g. 'electrons' or 'adu' OBASW On board application software version: version. DATE UT date when this file was created SOFTVERS version of the simulator or version of the LE1 EXPTIME Commanded integration time in seconds, e.g. 565 IMG_CAT Data product category: SCIENCE, CALIB, TECHNICA IMG_T1 values in {BIAS, DARK, FLAT, LINEARITY, CHARGE_INJ IMG_T2 values in {LAMP, SKY, DOME, OTHER...} from SEQU OBSMODE Observation Mode (WIDE, DEEP, CALIBRATION) OBSTYPE DP technique (IMAGE, SPECTROIMAGE) INSTRUME VIS, or VISsim for simulations TELESCOP Telescope name: EUCLID OBT_STA1 Integer, number of seconds of OBT (START_TIME) OBT_STA2 Integer, number of milliseconds of OBT (START_TIME) DATE-OBS Inst. seq. start time in UTC MJD-OBS Inst. seq. start time in MJD FIELDID Field Id OBS_ID Observation Id DITHOBS Dither number PTGID Pointing Id EXPNUM Exposure Id in dither TOTEXP Total number of Exposures in the specific Point INSTRMOD VIS intrument mode: Science or Manual COMPALGO Science TM compression mode: NoCompression, Co COMPPARA Science TM compression parameters: pixels/block RA reconstructed pointing RA DEC reconstructed pointing DEC PA reconstructed position angle SEQID VIS sequences as defined in EUCL-IFS-ICD-6-002 DATE-END Inst. seq. end time in UTC OBT_END1 Integer, number of seconds of OBT (VIS sequence OBT_END2 Integer, number of milliseconds of OBT (VIS seq NOMCHAIN Nominal or redundant electronic chain VSTART Index of first readout line (starting at 0) VEND Index of last readout line + 1 ROECFGID ROE configuration table ID RSUSINID Table version of RSU SINE table used in the RSU RSUFRID Table version of RSU FREQ table used in the RSU RSUSFRID Table version of RSU short FREQ table used in t RSUCFSTA Shutter unit configuration status: CLOSED_LOOP, TP_STAT Trap pumping status: off, parallel, serial, mul CUSTATUS Calibration unit status: On or Off CI_STAT Charge injection status: On or Off IDLTIME Time (s) between end of shutter opening or end OBT_STA OBT at start time DATE-ENH UTC of LE1 Enhancement AUX_VERS LE1 Enh. (AUX) Processor name & version ELAT Ecliptic latitude of the commanded attitude ELONG Ecliptic longitude of the commanded attitude POS Position Angle of the commanded attitude ALPHA Solar Alpha angle, in degrees, at the start of the exposure (commanded) BETA Solar Beta angle, in degrees, at the start of the exposure (commanded) SAA Solar Aspect Angle of the commanded attitude PATCH_ID Patch Id FOV_LAT1 RA of the common Field of View Corner 1 FOV_LAT2 RA of the common Field of View Corner 2 FOV_LAT3 RA of the common Field of View Corner 3 FOV_LAT4 RA of the common Field of View Corner 4 FOV_LON1 Dec of the common Field of View Corner 1 FOV_LON2 Dec of the common Field of View Corner 2 FOV_LON3 Dec of the common Field of View Corner 3 FOV_LON4 Dec of the common Field of View Corner 4 VS1T2043 Quad E/F of CCD6-1, 6-2, 6-3 ROE temperature VS1T2050 Quad G/H of CCD6-1, 6-2, 6-3 ROE temperature VS1T2020 CCD1-1 Quad E/F temperature VS1T2021 CCD1-1 Quad G/H temperature VS1T2028 CCD1-2 Quad E/F temperature VS1T2029 CCD1-2 Quad G/H temperature VS1T2036 CCD1-3 Quad E/F temperature VS1T2037 CCD1-3 Quad G/H temperature VS2T2043 Quad E/F of CCD2-1, 2-2, 2-3 ROE temperature VS2T2050 Quad G/H of CCD2-1, 2-2, 2-3 ROE temperature VS2T2020 CCD2-1 Quad E/F temperature VS2T2021 CCD2-1 Quad G/H temperature VS2T2028 CCD2-2 Quad E/F temperature VS2T2029 CCD2-2 Quad G/H temperature VS2T2036 CCD2-3 Quad E/F temperature VS2T2037 CCD2-3 Quad G/H temperature VS3T2043 Quad E/F of CCD3-1, 3-2, 3-3 ROE temperature VS3T2050 Quad G/H of CCD3-1, 3-2, 3-3 ROE temperature VS3T2020 CCD3-1 Quad E/F temperature VS3T2021 CCD3-1 Quad G/H temperature VS3T2028 CCD3-2 Quad E/F temperature VS3T2029 CCD3-2 Quad G/H temperature VS3T2036 CCD3-3 Quad E/F temperature VS3T2037 CCD3-3 Quad G/H temperature VS4T2043 Quad E/F of CCD4-1, 4-2, 4-3 ROE temperature VS4T2050 Quad G/H of CCD4-1, 4-2, 4-3 ROE temperature VS4T2020 CCD4-1 Quad E/F temperature VS4T2021 CCD4-1 Quad G/H temperature VS4T2028 CCD4-2 Quad E/F temperature VS4T2029 CCD4-2 Quad G/H temperature VS4T2036 CCD4-3 Quad E/F temperature VS4T2037 CCD4-3 Quad G/H temperature VS5T2043 Quad E/F of CCD5-1, 5-2, 5-3 ROE temperature VS5T2050 Quad G/H of CCD5-1, 5-2, 5-3 ROE temperature VS5T2020 CCD5-1 Quad E/F temperature VS5T2021 CCD5-1 Quad G/H temperature VS5T2028 CCD5-2 Quad E/F temperature VS5T2029 CCD5-2 Quad G/H temperature VS5T2036 CCD5-3 Quad E/F temperature VS5T2037 CCD5-3 Quad G/H temperature VS6T2043 Quad E/F of CCD6-1, 6-2, 6-3 ROE temperature VS6T2050 Quad G/H of CCD6-1, 6-2, 6-3 ROE temperature VS6T2020 CCD6-1 Quad E/F temperature VS6T2021 CCD6-1 Quad G/H temperature VS6T2028 CCD6-2 Quad E/F temperature VS6T2029 CCD6-2 Quad G/H temperature VS6T2036 CCD6-3 Quad E/F temperature VS6T2037 CCD6-3 Quad G/H temperature VS7T2043 Quad E/F of CCD1-4, 1-5, 1-6 ROE temperature VS7T2050 Quad G/H of CCD1-4, 1-5, 1-6 ROE temperature VS7T2020 CCD1-6 Quad E/F temperature VS7T2021 CCD1-6 Quad G/H temperature VS7T2028 CCD1-5 Quad E/F temperature VS7T2029 CCD1-5 Quad G/H temperature VS7T2036 CCD1-4 Quad E/F temperature VS7T2037 CCD1-4 Quad G/H temperature VS8T2043 Quad E/F of CCD2-4, 2-5, 2-6 ROE temperature VS8T2050 Quad G/H of CCD2-4, 2-5, 2-6 ROE temperature VS8T2020 CCD2-6 Quad E/F temperature VS8T2021 CCD2-6 Quad G/H temperature VS8T2028 CCD2-5 Quad E/F temperature VS8T2029 CCD2-5 Quad G/H temperature VS8T2036 CCD2-4 Quad E/F temperature VS8T2037 CCD2-4 Quad G/H temperature VS9T2043 Quad E/F of CCD3-4, 3-5, 3-6 ROE temperature VS9T2050 Quad G/H of CCD3-4, 3-5, 3-6 ROE temperature VS9T2020 CCD3-6 Quad E/F temperature VS9T2021 CCD3-6 Quad G/H temperature VS9T2028 CCD3-5 Quad E/F temperature VS9T2029 CCD3-5 Quad G/H temperature VS9T2036 CCD3-4 Quad E/F temperature VS9T2037 CCD3-4 Quad G/H temperature VSAT2043 Quad E/F of CCD4-4, 4-5, 4-6 ROE temperature VSAT2050 Quad G/H of CCD4-4, 4-5, 4-6 ROE temperature VSAT2020 CCD4-6 Quad E/F temperature VSAT2021 CCD4-6 Quad G/H temperature VSAT2028 CCD4-5 Quad E/F temperature VSAT2029 CCD4-5 Quad G/H temperature VSAT2036 CCD4-4 Quad E/F temperature VSAT2037 CCD4-4 Quad G/H temperature VSBT2043 Quad E/F of CCD5-4, 5-5, 5-6 ROE temperature VSBT2050 Quad G/H of CCD5-4, 5-5, 5-6 ROE temperature VSBT2020 CCD5-6 Quad E/F temperature VSBT2021 CCD5-6 Quad G/H temperature VSBT2028 CCD5-5 Quad E/F temperature VSBT2029 CCD5-5 Quad G/H temperature VSBT2036 CCD5-4 Quad E/F temperature VSBT2037 CCD5-4 Quad G/H temperature VSCT2043 Quad E/F of CCD6-4, 6-5, 6-6 ROE temperature VSCT2050 Quad G/H of CCD6-4, 6-5, 6-6 ROE temperature VSCT2020 CCD6-6 Quad E/F temperature VSCT2021 CCD6-6 Quad G/H temperature VSCT2028 CCD6-5 Quad E/F temperature VSCT2029 CCD6-5 Quad G/H temperature VSCT2036 CCD6-4 Quad E/F temperature VSCT2037 CCD6-4 Quad G/H temperature POS_X Spescraft position x POS_Y Spescraft position y POS_Z Spescraft position z VEL_X Spescraft velocity x VEL_Y Spescraft velocity y VEL_Z Spescraft velocity z CALBLKID Calblock id CALBLKVR Calblock variant DATASETR PPO DataSetRelease N_CCD BIASSEC Offset area relative to readout, 1-based REFCAT reference star catalogue fi FPAMODEL MAGZEROP zero-point PHOT_ERR self calibration photometric error PHOTIRMS self calibration mag dispersion RMS APERCORR self calibration aperture correction MAG_50pix - MAG_13pix APCORRMS self calibration aperture correction RMS FLXSCALE Flux scaling for stacked exposure ======== ================================================================ ============= ========================================================= Key Extension Header For CalibratedFrame ============= ========================================================= XTENSION IMAGE extension BITPIX number of bits per data pixel NAXIS number of data axes NAXIS1 length of data axis 1 NAXIS2 length of data axis 2 PCOUNT required keyword; must = 0 GCOUNT required keyword; must = 1 EXTNAME DETID CCD-ID field from science TM (0-35) CCDID e.g. Detector ID, e.g. '0-0', '1-1' ... '6-6' QUADID e.g. Quadrant ID, e.g. 'E', 'F', 'G' or 'H' ROEID ROE ID: 1-12 ROECTV ROE configuration table version BUNIT Pixel data unit, e.g. 'electrons' or 'adu' PRESCANX number of serial prescan pixels, e.g 51 OVRSCANX number of serial overscan pixels, e.g 29 OVRSCANY number of parallel overscan pixels, e.g 20 EXPDUR1 Nominal/Short, nominal with CI, Flat: duration EXPDUR2 Nominal/Short, nominal with CI, Flat: duration CRVAL1 CRVAL2 CRPIX1 CRPIX2 CD1_1 CD1_2 CD2_1 CD2_2 CTYPE1 CTYPE2 CUNIT1 CUNIT2 WCSAXES CMPRTSCI Quadrant image compression ratio obtained on-bo GAIN /mnt/gfs2/work_dir/CACHE/01/7f/EUC_VIS_MDL-GAIN RDNOISE /mnt/gfs2/work_dir/CACHE/ae/77/EUC_VIS_MDL-RON_ RA DEC PA EXPTIME SATLEVEL pixel saturation level in e- SATURATE pixel saturation level in ADU BIAS_LVL BIAS_RON BIAS_TOP BIAS_BTM BIAS_LFT BIAS_RGT GAINCORR `ref_gain`/`cal_gain` (3.480/3.432) LSFCORR large-scale flat corrected COSMICPC percent of COSMIC flagged pixels in extension STDCRMS NUMBRMS AVGRESID PV1_0 PV1_1 PV1_2 PV1_3 PV1_4 PV1_5 PV1_6 PV1_7 PV1_8 PV1_9 PV1_10 PV2_0 PV2_1 PV2_2 PV2_3 PV2_4 PV2_5 PV2_6 PV2_7 PV2_8 PV2_9 PV2_10 PTG_RECD pointing refitted, true or false RA_COMM commanding pointing RA DEC_COMM commanding pointing DEC PA_COMM commanding position angle RADESYS coordinate reference frame DATE-OBS TIMESYS MJD-OBS MAGZEROP zero-point PHOT_ERR self calibration photometric error PHOTIRMS self calibration mag dispersion RMS APERCORR self calibration aperture correction MAG_50pix APCORRMS self calibration aperture correction RMS FLXSCALE Flux scaling for stacked exposure ============= ========================================================= Weight Map ---------- When combining multiple dithered exposures from separate detectors with gaps it becomes important to assign a “confidence” to each detector pixel so that overlapping exposures can be combined and the noise level at each pixel can be correctly estimated. It is used in input of SWarp for produce :ref:`VisStackedFrame`. It corresponds to the small scale flat —reflecting the Pixel Response Non-Uniformity (PRNU)— where all invalid pixels are flagged with a weight of 0. **Name of file:** ``EUC_VIS_SWL_WGT-[ObsId]-[Dither]-[exposure]-0000000__[YYYYMMDDThhmmss.s]Z.fits.gz`` where the date is the production date. Data Header *********** +----------+--------------------------------------------------------------------+ | Primary Header for Weight Map | +==========+====================================================================+ | SIMPLE | conforms to FITS standard | +----------+--------------------------------------------------------------------+ | BITPIX | array data type | +----------+--------------------------------------------------------------------+ | NAXIS | number of array dimensions | +----------+--------------------------------------------------------------------+ | EXTEND | | +----------+--------------------------------------------------------------------+ +----------+--------------------------------------------------------------------+ | Extension Header for Weight Map | +==========+====================================================================+ | XTENSION | Image extension | +----------+--------------------------------------------------------------------+ | BITPIX | array data type | +----------+--------------------------------------------------------------------+ | NAXIS | number of array dimensions | +----------+--------------------------------------------------------------------+ | NAXIS1 | | +----------+--------------------------------------------------------------------+ | NAXIS2 | | +----------+--------------------------------------------------------------------+ | PCOUNT | Number of parameters | +----------+--------------------------------------------------------------------+ | GCOUNT | Number of groups | +----------+--------------------------------------------------------------------+ | EXTNAME | | +----------+--------------------------------------------------------------------+ | CCDID | | +----------+--------------------------------------------------------------------+ | WCSAXES | | +----------+--------------------------------------------------------------------+ | CTYPE1 | Coordinamte 1 type | +----------+--------------------------------------------------------------------+ | CTYPE2 | Coordinamte 2 type | +----------+--------------------------------------------------------------------+ | CUNIT1 | Physical units of CRVAL1 | +----------+--------------------------------------------------------------------+ | CUNIT2 | Physical units of CRVAL2 | +----------+--------------------------------------------------------------------+ | CRPIX1 | | +----------+--------------------------------------------------------------------+ | CRPIX2 | | +----------+--------------------------------------------------------------------+ | CD1_1 | | +----------+--------------------------------------------------------------------+ | CD1_2 | | +----------+--------------------------------------------------------------------+ | CD2_1 | | +----------+--------------------------------------------------------------------+ | CD2_2 | | +----------+--------------------------------------------------------------------+ | CRVAL1 | | +----------+--------------------------------------------------------------------+ | CRVAL2 | | +----------+--------------------------------------------------------------------+ | STDCRMS | | +----------+--------------------------------------------------------------------+ | NUMBRMS | | +----------+--------------------------------------------------------------------+ | AVGRESID | | +----------+--------------------------------------------------------------------+ | PV1_1 | | +----------+--------------------------------------------------------------------+ | PV2_1 | | +----------+--------------------------------------------------------------------+ | PV1_2 | | +----------+--------------------------------------------------------------------+ | PV2_2 | | +----------+--------------------------------------------------------------------+ | PV1_4 | | +----------+--------------------------------------------------------------------+ | PV2_4 | | +----------+--------------------------------------------------------------------+ | PV1_5 | | +----------+--------------------------------------------------------------------+ | PV2_5 | | +----------+--------------------------------------------------------------------+ | PV1_6 | | +----------+--------------------------------------------------------------------+ | PV2_6 | | +----------+--------------------------------------------------------------------+ | PV1_7 | | +----------+--------------------------------------------------------------------+ | PV2_7 | | +----------+--------------------------------------------------------------------+ | PV1_8 | | +----------+--------------------------------------------------------------------+ | PV2_8 | | +----------+--------------------------------------------------------------------+ | PV1_9 | | +----------+--------------------------------------------------------------------+ | PV2_9 | | +----------+--------------------------------------------------------------------+ | PV1_10 | | +----------+--------------------------------------------------------------------+ | PV2_10 | | +----------+--------------------------------------------------------------------+ | RA_COMM | commanding pointing RA | +----------+--------------------------------------------------------------------+ | DEC_COMM | commanding pointing DEC | +----------+--------------------------------------------------------------------+ | PA_COMM | commanding position angle | +----------+--------------------------------------------------------------------+ | RA | reconstructed pointing RA | +----------+--------------------------------------------------------------------+ | DEC | reconstructed pointing DEC | +----------+--------------------------------------------------------------------+ | PA | reconstructed position angle | +----------+--------------------------------------------------------------------+ | REFCAT | reference star catalogue file | +----------+--------------------------------------------------------------------+ | FPAMODEL | fpa model file | +----------+--------------------------------------------------------------------+ Background Map -------------- The background map delivered is calculated using NoiseChisel. It seems that NoiseChisel is able to capture the straylight and lot of feature. However for large object the background calculation can be not optimal. As NoiseChisel is more sensitive to cosmic we have implemented some fall-back in case of crash. The type of background calculation can be found in the :ref:`VisAnalysisResults` associated with these different values: * NC1 : NoiseChisel methode 1 * NC2 : NoiseChisel methode 2 * HISTMODE : Mod of the image **Name of file:** ``EUC_VIS_SWL_BKG-[ObsId]-[Dither]-[exposure]-0000000__[YYYYMMDDThhmmss.s]Z.fits.gz`` where the date is the production date. .. note:: At the beginning VIS used the SExtractor background. But we found it was not optimal. In VIS-PF 15.0.4 we switched to use NoiseChisel, which shows improvement in background calculation. Data Header *********** +----------+----------------------------------------------------------------------+ | Primary Header for Background Map | +==========+======================================================================+ | SIMPLE | This is a FITS file | +----------+----------------------------------------------------------------------+ | BITPIX | | +----------+----------------------------------------------------------------------+ | NAXIS | | +----------+----------------------------------------------------------------------+ | EXTEND | This file may contain FITS extensions | +----------+----------------------------------------------------------------------+ | NEXTEND | Number of extensions | +----------+----------------------------------------------------------------------+ | MAGZEROP | zero-point | +----------+----------------------------------------------------------------------+ | PHOT_ERR | self calibration photometric error | +----------+----------------------------------------------------------------------+ | PHOTIRMS | self calibration mag dispersion RMS | +----------+----------------------------------------------------------------------+ | APERCORR | self calibration aperture correction MAG_50pix - MAG_13pix | +----------+----------------------------------------------------------------------+ | APCORRMS | self calibration aperture correction rms error | +----------+----------------------------------------------------------------------+ | EXPTIME | Commanded integration time in seconds, e.g. 565.0 | +----------+----------------------------------------------------------------------+ +----------+----------------------------------------------------------------------+ | Extension Header for Background Map | +==========+======================================================================+ | XTENSION | Image extension | +----------+----------------------------------------------------------------------+ | BITPIX | array data type | +----------+----------------------------------------------------------------------+ | NAXIS | number of array dimensions | +----------+----------------------------------------------------------------------+ | NAXIS1 | | +----------+----------------------------------------------------------------------+ | NAXIS2 | | +----------+----------------------------------------------------------------------+ | PCOUNT | Number of parameters | +----------+----------------------------------------------------------------------+ | GCOUNT | Number of groups | +----------+----------------------------------------------------------------------+ | EXTNAME | | +----------+----------------------------------------------------------------------+ | DETID | CCD-ID field from science TM (0-35) | +----------+----------------------------------------------------------------------+ | CCDID | Detector ID, e.g. '0-0', '1-1' ... '6-6' | +----------+----------------------------------------------------------------------+ | ROEID | ROE ID: 1-12 | +----------+----------------------------------------------------------------------+ | ROECTV | ROE configuration table version | +----------+----------------------------------------------------------------------+ | BUNIT | Pixel data unit, e.g. 'electrons' or 'adu' | +----------+----------------------------------------------------------------------+ | PRESCANX | Number of serial prescan pixels, e.g 51 | +----------+----------------------------------------------------------------------+ | OVRSCANX | Number of serial overscan pixels, e.g 29 | +----------+----------------------------------------------------------------------+ | OVRSCANY | Number of parallel overscan pixels, e.g 20 | +----------+----------------------------------------------------------------------+ | EXPDUR1 | Nominal/Short, nominal with CI, Flat: duration | +----------+----------------------------------------------------------------------+ | EXPDUR2 | Nominal/Short, nominal with CI, Flat: duration | +----------+----------------------------------------------------------------------+ | CRVAL1 | | +----------+----------------------------------------------------------------------+ | CRVAL2 | | +----------+----------------------------------------------------------------------+ | CRPIX1 | | +----------+----------------------------------------------------------------------+ | CRPIX2 | | +----------+----------------------------------------------------------------------+ | CD1_1 | | +----------+----------------------------------------------------------------------+ | CD1_2 | | +----------+----------------------------------------------------------------------+ | CD2_1 | | +----------+----------------------------------------------------------------------+ | CD2_2 | | +----------+----------------------------------------------------------------------+ | CTYPE1 | Coordinamte 1 type | +----------+----------------------------------------------------------------------+ | CTYPE2 | Coordinamte 2 type | +----------+----------------------------------------------------------------------+ | CUNIT1 | Physical units of CRVAL1 | +----------+----------------------------------------------------------------------+ | CUNIT2 | Physical units of CRVAL2 | +----------+----------------------------------------------------------------------+ | WCSAXES | | +----------+----------------------------------------------------------------------+ | CMPRTSCI | Quadrant image compression ratio obtained on-board | +----------+----------------------------------------------------------------------+ | GAIN | | +----------+----------------------------------------------------------------------+ | RDNOISE | | +----------+----------------------------------------------------------------------+ | RA | reconstructed pointing RA | +----------+----------------------------------------------------------------------+ | DEC | reconstructed pointing DEC | +----------+----------------------------------------------------------------------+ | PA | reconstructed position angle | +----------+----------------------------------------------------------------------+ | EXPTIME | Commanded integration time in seconds, e.g. 565.0 | +----------+----------------------------------------------------------------------+ | SATLEVEL | pixel saturation level in e- | +----------+----------------------------------------------------------------------+ | SATURATE | pixel saturation level in ADU | +----------+----------------------------------------------------------------------+ | BIAS_TOP | | +----------+----------------------------------------------------------------------+ | BIAS_BTM | | +----------+----------------------------------------------------------------------+ | BIAS_LFT | | +----------+----------------------------------------------------------------------+ | BIAS_RGT | | +----------+----------------------------------------------------------------------+ | GAINCORR | ref_gain/cal_gain | +----------+----------------------------------------------------------------------+ | BIASLVLE | | +----------+----------------------------------------------------------------------+ | BIASRONE | | +----------+----------------------------------------------------------------------+ | BIASLVLF | | +----------+----------------------------------------------------------------------+ | BIASRONF | | +----------+----------------------------------------------------------------------+ | BIASLVLG | | +----------+----------------------------------------------------------------------+ | BIASRONG | | +----------+----------------------------------------------------------------------+ | BIASLVLH | | +----------+----------------------------------------------------------------------+ | BIASRONH | | +----------+----------------------------------------------------------------------+ | LSFCORR | | +----------+----------------------------------------------------------------------+ | COSMICPC | percent of COSMIC flagged pixels in extension | +----------+----------------------------------------------------------------------+ | STDCRMS | | +----------+----------------------------------------------------------------------+ | NUMBRMS | | +----------+----------------------------------------------------------------------+ | AVGRESID | | +----------+----------------------------------------------------------------------+ | PV1_1 | | +----------+----------------------------------------------------------------------+ | PV2_1 | | +----------+----------------------------------------------------------------------+ | PV1_2 | | +----------+----------------------------------------------------------------------+ | PV2_2 | | +----------+----------------------------------------------------------------------+ | PV1_4 | | +----------+----------------------------------------------------------------------+ | PV2_4 | | +----------+----------------------------------------------------------------------+ | PV1_5 | | +----------+----------------------------------------------------------------------+ | PV2_5 | | +----------+----------------------------------------------------------------------+ | PV1_6 | | +----------+----------------------------------------------------------------------+ | PV2_6 | | +----------+----------------------------------------------------------------------+ | PV1_7 | | +----------+----------------------------------------------------------------------+ | PV2_7 | | +----------+----------------------------------------------------------------------+ | PV1_8 | | +----------+----------------------------------------------------------------------+ | PV2_8 | | +----------+----------------------------------------------------------------------+ | PV1_9 | | +----------+----------------------------------------------------------------------+ | PV2_9 | | +----------+----------------------------------------------------------------------+ | PV1_10 | | +----------+----------------------------------------------------------------------+ | PV2_10 | | +----------+----------------------------------------------------------------------+ | RA_COMM | Commanding pointing RA | +----------+----------------------------------------------------------------------+ | DEC_COMM | Commanding pointing DEC | +----------+----------------------------------------------------------------------+ | PA_COMM | Commanding position angle | +----------+----------------------------------------------------------------------+ | REFCAT | reference star catalogue file | +----------+----------------------------------------------------------------------+ | FPAMODEL | | +----------+----------------------------------------------------------------------+ | MAGZEROP | zero-point | +----------+----------------------------------------------------------------------+ | PHOT_ERR | self calibration photometric error | +----------+----------------------------------------------------------------------+ | PHOTIRMS | self calibration mag dispersion RMS | +----------+----------------------------------------------------------------------+ | APERCORR | self calibration aperture correction MAG_50pix - MAG_13pix | +----------+----------------------------------------------------------------------+ | APCORRMS | self calibration aperture correction rms error | +----------+----------------------------------------------------------------------+ | FLXSCALE | Flux scaling for stacked exposure | +----------+----------------------------------------------------------------------+ | CCD_RA | CCD center right ascension | +----------+----------------------------------------------------------------------+ | CCD_DEC | CCD center declination | +----------+----------------------------------------------------------------------+ | BKG_MED | CCD bkg median value in MJY/sr | +----------+----------------------------------------------------------------------+ | BKG_MAD | CCD bkg median absolute deviation in MJy/sr | +----------+----------------------------------------------------------------------+ .. DetailedDescEnd