Vis Large Flat Frame Product¶
Metadata¶
Data product name |
DpdVisLargeFlatFrame |
Data product custodian |
VIS |
Name of the Schema file |
|
Processing Element(s) creating/using the data product |
Used internally in OUVIS for science pipeline (ProcessField) during the Correction stage. |
Processing function using the data product |
VIS |
Proposed for inclusion in EAS/SAS¶
Yes
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¶
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 |