Vis PSF Model Product¶
Metadata¶
Data product name |
DpdVisPSFModel |
Data product custodian |
VIS |
Name of the Schema file |
|
Processing Element(s) creating/using the data product |
VIS |
Processing function using the data product |
VIS and MER |
Proposed for inclusion in EAS/SAS¶
Yes
Data product elements¶
Header |
object of type sys:genericHeader |
Data |
object of type vis:visPSFModel |
QualityFlags |
object of type dqc:sqfPlaceHolder |
Parameters |
object of type ppr:genericKeyValueParameters |
Detailed description of the data product¶
This model refers to the PSF grid (.fits) and PSF Model (.psf) data output by PSFex (Bertin 2011). PSF is quadrant-based. This means that each file has 144 extensions. The grid file refers to the check image snapshot.
It is computed on a dense stellar field observation (PV023) and is montly checked and/or updated with F-001 selfcal visits.
In DR1 the PSF model is the same for all the time periods. It is known that the model in DR1 is not optimal because it is not BFE corrected.
This is the model used to calculate the spread model in the Vis Calibrated Catalogue Product.
The PSF model is delivered with all calibrated frame.
PSF model¶
Name of file:
EUC_VIS_MDL-PSF-000-000000-0000000__[YYYYMMDDThhmmss.s]Z.psf
where the date is the production date.
Primary header:
SIMPLE |
This is a FITS file |
BITPIX |
|
NAXIS |
|
EXTEND |
This file may contain FITS extensions |
Extension header:
XTENSION |
THIS IS A BINARY TABLE (FROM THE LDACTOOLS) |
BITPIX |
|
NAXIS |
|
NAXIS1 |
BYTES PER ROW |
NAXIS2 |
NUMBER OF ROWS |
PCOUNT |
RANDOM PARAMETER COUNT |
GCOUNT |
GROUP COUNT |
TFIELDS |
FIELDS PER ROWS |
EXTNAME |
TABLE NAME |
LOADED |
Number of loaded sources |
ACCEPTED |
Number of accepted sources |
CHI2 |
Final reduced chi2 |
POLNAXIS |
Number of context parameters |
POLGRP1 |
Polynom group for this context parameter |
POLNAME1 |
Name of this context parameter |
POLZERO1 |
Offset value for this context parameter |
POLSCAL1 |
Scale value for this context parameter |
POLGRP2 |
Polynom group for this context parameter |
POLNAME2 |
Name of this context parameter |
POLZERO2 |
Offset value for this context parameter |
POLSCAL2 |
Scale value for this context parameter |
POLNGRP |
Number of context groups |
POLDEG1 |
Polynom degree for this context group |
PSF_FWHM |
PSF FWHM in image pixels |
PSF_SAMP |
Sampling step of the PSF data in image pixels |
PSFNAXIS |
Dimensionality of the PSF data |
PSFAXIS1 |
Number of element along this axis |
PSFAXIS2 |
Number of element along this axis |
PSFAXIS3 |
Number of element along this axis |
TTYPE1 |
Tabulated PSF data |
TFORM1 |
|
TDIM1 |
|
TTYPE2 |
PSF basis vector coefficients |
TFORM2 |
|
TDIM2 |
|
ORIEXTNM |
PSF grid¶
Name of file:
EUC_VIS_GRD-PSF-000-000000-0000000__[YYYYMMDDThhmmss.s]Z.psf
where the date is the production date.
Primary header:
SIMPLE |
This is a FITS file |
BITPIX |
|
NAXIS |
|
EXTEND |
This file may contain FITS extensions |
NEXTEND |
Number of extensions |
Extension header:
XTENSION |
THIS IS A BINARY TABLE (FROM THE LDACTOOLS) |
BITPIX |
|
NAXIS |
|
NAXIS1 |
BYTES PER ROW |
NAXIS2 |
NUMBER OF ROWS |
PCOUNT |
RANDOM PARAMETER COUNT |
GCOUNT |
GROUP COUNT |
TFIELDS |
FIELDS PER ROWS |
EXTNAME |
TABLE NAME |
CD1_1 |
pixel scale in deg |
CD1_2 |
pixel scale in deg |
CD2_1 |
pixel scale in deg |
CD2_2 |
pixel scale in deg |
PSF_SAMP |
Sampling step of the PSF data |
TELESCOP |
|
INSTRUME |
|
PIXSIZE |
pixel size in microns |
ECPSIZE |
nominal Euclid pixel size in microns |
OVERSAMP |
oversampling factor for this PSF |