.. _VISLargeFlatFrame: ============================ Vis Large Flat Frame Product ============================ Metadata ______________________ +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Data product name | DpdVisLargeFlatFrame | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Data product custodian | VIS | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Name of the Schema file | .. raw:: html | | | | | | `euc-vis-LargeFlatFrame.xsd `_ | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Processing Element(s) creating/using the data | Used internally in OUVIS for science pipeline (ProcessField) during the Correction stage. | | product | | +------------------------------------------------+----------------------------------------------------------------------------------------------+ | Processing function using the data product | VIS | +------------------------------------------------+----------------------------------------------------------------------------------------------+ Proposed for inclusion in EAS/SAS ========================================== .. PFUsingStart Yes .. PFUsingEnd Data product elements ===================== +--------------+----------------------------------------------+ | Header | object of type sys:genericHeader | +--------------+----------------------------------------------+ | Data | object of type vis:visLargeFlatFrame | +--------------+----------------------------------------------+ | QualityFlags | object of type dqc:sqfPlaceHolder | +--------------+----------------------------------------------+ | Parameters | object of type ppr:genericKeyValueParameters | +--------------+----------------------------------------------+ Detailed description of the data product ======================================== .. DetailedDescStart The Large Flat frame is the result of the Large Flat Calibration Pipeline. The product is a multiple extension fits with 144 extensions, based on the detectors with the EXTNAME noted as the QUADID. The product contains the correction factor in magnitude. It is calculated using the self caibration field. Thus the Largeflat product is heavily reliant on its modelling based on the results of Astrometry and positions form the Crossmatch. The processing also allows to calculate the QE of each quadrant. This coresponds to a constant value calculated during the surface fitting of the product. This constant is substracted from the image and saved in the keyword QE. The correction task adds this constant before the correction. **Name of file:** ``EUC_VIS_LARGEFLATCAL_[SCF_date]_[ExposureTime]__[YYYYMMDDThhmmss.s]Z.fits`` where SCF_date is the date in format YYYYYMMDD of the first exposure of the selfcal field used and the end date is the production date. Data Header ----------- Primary Header: ============ ========================================================= SIMPLE conforms to FITS standard BITPIX array data type NAXIS number of array dimensions EXTEND TELESCOP INSTRUME VERSION DATE OBSTYPE SEQID DATE-OBS DATE-UTC EXPTIME VAL_STA VAL_END TIME_STA TIME_END SUBDETQE True if QE offset has been subtracted from LSF ============ ========================================================= Extension Header: ============ ========================================================= XTENSION Image extension BITPIX array data type NAXIS number of array dimensions NAXIS1 NAXIS2 PCOUNT number of parameters GCOUNT number of groups DET_ID QUADID CCDID WCSAXES Number of coordinate axes CRPIX1 Pixel coordinate of reference point CRPIX2 Pixel coordinate of reference point PC1_1 Coordinate transformation matrix element PC2_2 Coordinate transformation matrix element CDELT1 [mm] Coordinate increment at reference point CDELT2 [mm] Coordinate increment at reference point CUNIT1 Units of coordinate increment and value CUNIT2 Units of coordinate increment and value CTYPE1 Coordinate type code CTYPE2 Coordinate type code CRVAL1 [mm] Coordinate value at reference point CRVAL2 [mm] Coordinate value at reference point LATPOLE [deg] Native latitude of celestial pole MJDREF [d] MJD of fiducial time EXTNAME extension name ============ ========================================================= .. DetailedDescEnd