Collaborative repository for tracking advance on a personnal implementation of SExtractor+PSFEx for ZTF data
The .fits files are to be stored locally in the
Data folder. We are currently working with the
following files:
mskimgpsfcatsciimgsciimgdaopsfcent
that can be taken from here
The sciunc.fits file has to be created from the sciimg one. One can do so
with the following:
from astropy.io import fits
from ztfimg import image
root = '../Data/'
sciimg = root + 'ztf_20190124095417_000403_zr_c01_o_q1_sciimg.fits'
hdul = fits.open(sciimg)
header = hdul[0].header
z = image.ScienceImage(sciimg, mask)
z.load_source_background()
file_out = sciimg[:-11] + 'sciunc.fits'
sciunc_out = fits.HDUList(fits.PrimaryHDU(data=z.sourcebackground.rms(),
header=header))
sciunc_out.writeto(file_out, overwrite=True)as can be found in the psf_comp notebook.
We use the following command to obtain the test.cat output of SExtractor, which will be inside BlackGEM_default as defined in the first line:
sex ztf_20190124095417_000403_zr_c01_o_q1_sciimg.fits -c config_ZOGY/BlackGEM_default/sex.config -SATUR_LEVEL 50000 -SEEING_FWHM 2.58933692741394 -PIXEL_SCALE 1.012 -MAG_ZEROPOINT 0 -WEIGHT_IMAGE ztf_20190124095417_000403_zr_c01_o_q1_sciunc.fits,ztf_20190124095417_000403_zr_c01_o_q1_sciunc.fits -FLAG_IMAGE ztf_20190124095417_000403_zr_c01_o_q1_mskimg.fits -CATALOG_TYPE FITS_LDAC -CHECKIMAGE_TYPE OBJECTS -CHECKIMAGE_NAME ztf_20190124095417_000403_zr_c01_o_q1_sexcat_ldac.fits -VERBOSE_TYPE NORMAL
If you wish to use another configuration file, simply change BlackGEM_default to another folder in config_ZOGY. If you wish to change where the output goes, change the sex.config and psfex.config files of the subdirectory you chose accordingly.
We use the following command to obtain the test.psf and psfex_out.cat outputs of PSFEx, which will be inside BlackGEM_default as defined in psfex.config:
psfex config_ZOGY/BlackGEM_default/test.cat -c config_ZOGY/BlackGEM_default/psfex.config
See psfex-ztflc_fit notebook.