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Tim Jenness > Astro-FITS-HdrTrans-1.54 > Astro::FITS::HdrTrans::WFCAM



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Module Version: 1.50   Source   Latest Release: Astro-FITS-HdrTrans-1.61


Astro::FITS::HdrTrans::WFCAM - UKIRT WFCAM translations


  use Astro::FITS::HdrTrans::WFCAM;

  %gen = Astro::FITS::HdrTrans::WFCAM->translate_from_FITS( %hdr );


This class provides a generic set of translations that are specific to the WFCAM camera of the United Kingdom Infrared Telescope.



The name of the instrument required to match (case insensitively) against the INSTRUME/INSTRUMENT keyword to allow this class to translate the specified headers. Called by the default can_translate method.

  $inst = $class->this_instrument();

Returns "WFCAM".


These methods are more complicated than a simple mapping. We have to provide both from- and to-FITS conversions All these routines are methods and the to_ routines all take a reference to a hash and return the translated value (a many-to-one mapping). The from_ methods take a reference to a generic hash and return a translated hash (sometimes these are many-to-many).


Returns the data units. This uses the BUNIT header, with a default of "counts/exp" (unless the observations was with a ND read type between 2006-10-23 and 2006-12-20 when the default was "counts/sec").


Returns the declination pixel scale in in arcseconds per pixel. For Cameras 1 and 3, it scales the CD2_1 keyword to the DEC_SCALE generic header. For Cameras 2 and 4, it scales the CD2_2 keyword instead.


For Cameras 1 and 3, it scales the DEC_SCALE generic header to the CD2_1 header. For Cameras 2 and 4, it scales DEC_SCALE to the CD2_2 header. The returned units are degrees per pixel.


Determines the gain entirely from camera number.

The GAIN FITS header is not used.


This is a null operation. The GAIN FITS header in WFCAM data is always incorrect.


Return the number of offsets (jitters and micro steps).


Returns the RABASE header converted to degrees.


Returns the right-ascension pixel scale in arcseconds per pixel. For Cameras 1 and 3, it scales the CD1_2 keyword to the RA_SCALE generic header. For Cameras 2 and 4, it scales the CD1_1 keyword instead.


For Cameras 1 and 3, it scales the RA_SCALE generic header to the CD1_2 keyword. For Cameras 2 and 4, scales RA_SCALE to the CD1_1 keyword. Returned units are degrees per pixel.


Determines the rotation of the array in world co-ordinates.




Astro::FITS::HdrTrans, Astro::FITS::HdrTrans::UKIRT.


Brad Cavanagh <>, Tim Jenness <>. Malcolm J. Currie <>


Copyright (C) 2008 Science and Technology Facilities Council. Copyright (C) 2003-2005 Particle Physics and Astronomy Research Council. All Rights Reserved.

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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

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