Astro::FITS::HdrTrans::JAC - Base class for translation of Joint Astronomy Centre instruments.

  use Astro::FITS::HdrTrans::JAC;

This class provides a generic set of translations that are common to instrumentation from the Joint Astronomy Centre. It should not be used directly for translation of instrument FITS headers.

This routine overrides the base class implementation to enable the caches to be cleared and for the location of the DATE-OBS/DATE-END field to be found so that base class implementations will work correctly.

This means that some conversion methods (in particular those using time in a base class) may not work properly outside the context of a full translation unless they have been subclassed locally.

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_OBSERVATION_ID

Converts the OBSID header directly into the OBSERVATION_ID generic header, or if that header does not exist, converts the INSTRUME, RUNNR, and DATE-OBS headers into OBSERVATION_ID.

The form of the observation ID string is documented in JSA/ANA/001 (http://docs.jach.hawaii.edu/JCMT/JSA/ANA/001/jsa_ana_001.pdf).

_fix_dates

Sort out DATE-OBS and DATE-END in cases where they are not available directly. This is mainly an issue with database retrievals where the date format is not FITS compliant.

  Astro::FITS::HdrTrans::JAC->_fix_dates( \%headers );

$Id$

Astro::FITS::HdrTrans, Astro::FITS::HdrTrans::Base.

Brad Cavanagh <b.cavanagh@jach.hawaii.edu>.

Copyright (C) 2007 Science and Technology Facilities Council. Copyright (C) 2006 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.