NAME

visir_util_undistort - Correct the distortion in spectral data

SYNOPSIS

esorex visir_util_undistort [OPTIONS] FILE.sof

DESCRIPTION

The files listed in the Set Of Frames (sof-file) must be tagged: VISIR-chopnod-corrected-file.fits CHOPNOD_CORRECTED Optionally, a bad pixel map may be provided: VISIR-bpm-file.fits STATIC_MASK

The product(s) will have a FITS card ´HIERARCH ESO PRO CATG´ with a value of: UNDISTORTED The recipe default values for the transformation are only valid for spectral data taken in Low resolution mode

OPTIONS

--bkgcorrect <bool>

Cho-nod correct the data (bool; default: True). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.bkgcorrect [default = True].

--xl <int>

Coordinate in spatial direction. Together with yl it defines the lower point of a rectangle containing only skylines for the wavelength shift detection (int; default: 117). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.xl [default = 117].

--yl <int>

Coordinate in wavelength direction. See xl (int; default: 110). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.yl [default = 110].

--xh <int>

Coordinate in spatial direction. Together with yl it defines the higher point of a rectangle containing only skylines for the wavelength shift detection (int; default: 125). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.xh [default = 125].

--yh <int>

Coordinate in wavelength direction. See xh (int; default: 150). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.yh [default = 150].

--slit_skew <float>

Distortion correction: Skew of slit (degrees) (clockwise) (float; default: 0.52). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.phi [default = 0.52].

--spectrum_skew <float>

Distortion correction: LMR Skew of spectrum (degrees) (counter- clockwise). Not used in High Resolution (float; default: 1.73). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.ksi [default = 1.73].

--vert_arc <float>

Distortion correction: LR Detector vertical curvature (pixel). Reduced by a factor 4 in MR. Not used in HR A-side. Increased by a factor 115/52 in HR B-side (float; default: -0.8). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.eps [default = -0.8].

--hori_arc <float>

Distortion correction: LMR Detector horizontal curvature (pixel). Increased by a factor 1.5 in HR A-side. Reduced by a factor 2 in HR B-side (float; default: 0.0). The full name of this option for the EsoRex configuration file is visir.visir_util_undistort.delta [default = 0.0].

Note that it is possible to create a configuration file containing these options, along with suitable default values. Please refer to the details provided by the 'esorex --help' command.

SEE ALSO

The full documentation for the visir pipeline can be downloaded as a PDF file using the following URL:

ftp://ftp.eso.org/pub/dfs/pipelines/visir/visir-pipeline-manual-1.4.pdf

An overview over the existing ESO pipelines can be found on the web page https://www.eso.org/sci/software/pipelines/.

Basic documentation about the EsoRex program can be found at the esorex (1) man page.

It is possible to call the pipelines from python using the python-cpl package. See https://packages.python.org/python-cpl/index.html for further information.

The other recipes of the visir pipeline are visir_img_dark(7), visir_img_ff(7), visir_img_reduce(7), visir_img_trans(7), visir_old_img_combine(7), visir_old_img_phot(7), visir_old_spc_obs(7), visir_old_spc_obs_ech(7), visir_old_spc_phot(7), visir_old_spc_phot_ech(7), visir_old_spc_wcal(7), visir_old_spc_wcal_ech(7), visir_old_util_destripe(7), visir_spc_reduce(7), visir_util_apply_calib(7), visir_util_clip(7), visir_util_convert_weight(7), visir_util_detect_shift(7), visir_util_img_std_cat(7), visir_util_join(7), visir_util_qc(7), visir_util_repack(7), visir_util_run_swarp(7), visir_util_spc_std_cat(7), visir_util_spc_txt2fits(7)

VERSION

visir_util_undistort 4.4.2

AUTHOR

Lars Lundin <https://support.eso.org>

BUG REPORTS

Please report any problems to https://support.eso.org. Alternatively, you may send a report to the ESO User Support Department <usd-help@eso.org>.

LICENSE

This file is part of the VISIR Instrument Pipeline Copyright (C) 2011 European Southern Observatory

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1307 USA