NAME

Astro::FITS::HdrTrans::CGS4 - UKIRT CGS4 translations for "old" style CGS4 headers.

SYNOPSIS

  use Astro::FITS::HdrTrans::CGS4Old;

  %gen = Astro::FITS::HdrTrans::CGS4Old->translate_from_FITS( %hdr );

DESCRIPTION

This class provides a generic set of translations that are specific to the CGS4 spectrometer of the United Kingdom Infrared Telescope.

METHODS

can_translate

Returns true if the supplied headers can be handled by this class.

  $cando = $class->can_translate( \%hdrs );

This method returns true if the INSTRUME header exists and is equal to 'CGS4', and if the IDATE header exists, matches the regular expression '\d{8}', and is less than 20081115.

COMPLEX CONVERSIONS

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)

to_POLARIMETRY

Checks the FILTER FITS header keyword for the existance of 'prism'. If 'prism' is found, then the POLARIMETRY generic header is set to 1, otherwise 0.

to_DEC_TELESCOPE_OFFSET

The header keyword for the Dec telescope offset changed from DECOFF to TDECOFF on 20050315, so switch on this date to use the proper header.

from_DEC_TELESCOPE_OFFSET

The header keyword for the Dec telescope offset changed from DECOFF to TDECOFF on 20050315, so return the proper keyword depending on observation date.

to_RA_TELESCOPE_OFFSET

The header keyword for the RA telescope offset changed from RAOFF to TRAOFF on 20050315, so switch on this date to use the proper header.

from_RA_TELESCOPE_OFFSET

The header keyword for the RA telescope offset changed from RAOFF to TRAOFF on 20050315, so return the proper keyword depending on observation date.

to_SAMPLING

Converts FITS header values in DETINCR and DETNINCR to a single descriptive string.

from_TELESCOPE

Returns 'UKIRT, Mauna Kea, HI' for the TELESCOP FITS header.

REVISION

 $Id$

SEE ALSO

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

AUTHOR

Brad Cavanagh <b.cavanagh@jach.hawaii.edu>, Tim Jenness <t.jenness@jach.hawaii.edu>.

COPYRIGHT

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