vmdet - Determine RON, gain, and bad pixels from a set of flat field exposures.
This recipe is used to estimate the read-out-noise (RON) and the gain of the
CCD, and to determine the positions of the bad pixels.
The input SOF should contain at least five pairs of flat field exposures, all
belonging to the same quadrant, each pair corresponding to a different
exposure time. The flat fields can be produced either in imaging or in MOS
mode. In MOS mode a HR grism is used, in order to illuminate the CCD also
beyond the central region used in direct imaging mode, but no mask is inserted
at the telescope focal plane.
This type of exposure cannot really be considered a spectral flat field, because
the CCD is exposed to white light (i.e., without a wavelength dependency along
the dispersion direction). The flat fields generated for the purpose of
determining the detector properties are assigned the DO category
DETECTOR_PROPERTIES, to distinguish them from the more common IMG_SCREEN_FLAT
or MOS_SCREEN_FLAT that are used to produce master calibrations.
DO category: Type: Explanation: Required:
DETECTOR_PROPERTIES Raw Flat field Y
MASTER_BIAS Calib Master bias Y
DO category: Data type: Explanation:
CCD_TABLE FITS table Bad pixel table
(none) FITS image Bad pixel image
(none) FITS image Error image
Only the primary product, the bad pixel table, is copied (or moved) to the
product directory. Other products are generated only on request (typically for
debug purposes) and are not assigned a DO category as they would not be used
anywhere in further data processing steps.
For more details, please refer to the VIMOS Pipeline User´s Guide.
- --CreateBadPixelMap <bool>
- Bad pixel map creation (bool; default: True). The full name
of this option for the EsoRex configuration file is
vimos.Parameters.map [default = True].
- --CreateErrorImage <bool>
- Response slope uncertainty map creation (bool; default:
False). The full name of this option for the EsoRex configuration file is
vimos.Parameters.error [default = False].
- --DetectionThreshold <float>
- Threshold in determination of bad pixels (float; default:
5.0). The full name of this option for the EsoRex configuration file is
vimos.Parameters.threshold [default = 5.0].
- --DetectionMode <str>
- Bad pixel detection method (str; default:
´Intolerant´). The full name of this option for the EsoRex
configuration file is vimos.Parameters.method [default =
- --ComputeQC <bool>
- Compute QC1 parameters. (bool; default: True). The full
name of this option for the EsoRex configuration file is
vimos.Parameters.quality.enable [default = True].
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.
The full documentation for the vimos pipeline can be downloaded as a PDF file
using the following URL:
An overview over the existing ESO pipelines can be found on the web page
Basic documentation about the EsoRex program can be found at the esorex (1) man
It is possible to call the pipelines from python using the python-cpl package.
The other recipes of the vimos pipeline are vmbias
ESO VIMOS Pipeline Team <email@example.com>
Please report any problems to firstname.lastname@example.org. Alternatively, you may send a
report to the ESO User Support Department <email@example.com>.
This file is part of the VIMOS Instrument Pipeline Copyright (C) 2002-2005
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
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 02110-1301 USA