~~NOTOC~~ {{ :spam.jpg?nolink&150|}} ===== Source Peeling and Atmospheric Modeling ===== SPAM is a Python-based extension to [[http://www.aips.nrao.edu/|AIPS]] ([[http://adsabs.harvard.edu/abs/2003ASSL..285..109G|Greisen 2003]]), aimed at reducing high-resolution, low-frequency radio interferometric observations in a very efficient, systematic and reproducible way. Special features in SPAM, like direction-dependent ionospheric calibration and image-plane ripple suppression, will help to make high-quality sub-GHz images. SPAM is a Python module, including some C-code optimalizations, that uses the Python-to-AIPS interface [[http://www.jive.nl/jivewiki/doku.php?id=parseltongue:parseltongue|ParselTongue]] ([[http://adsabs.harvard.edu/abs/2006ASPC..351..497K|Kettenis et al. 2006]]), which itself is based on [[http://www.cv.nrao.edu/~bcotton/Obit.html|ObitTalk]] ([[http://adsabs.harvard.edu/abs/2008PASP..120..439C|Cotton 2008]]). ParselTongue provides access to AIPS tasks, data files (images & visibilities) and tables. SPAM also uses several standard Python libraries like scipy, pylab, matplotlib, and numpy. Data reductions are captured in well-tested Python scripts that executes AIPS tasks directly (mostly during initial data reduction steps), calls high-level functions that make multiple AIPS or ParselTongue calls, and require few manual operations. SPAM now also includes a fully automated pipeline for reducing legacy GMRT observations at 150, 235, 325 and 610 MHz. Some users have also successfully applied it to legacy GMRT 1.4 GHz observations. [[huibintema:spam:install|Download and install SPAM on your Linux 64-bit system]] [[huibintema:spam:startup|Starting up SPAM]] [[huibintema:spam:pipeline|Running the SPAM pipeline]] [[huibintema:spam:faq|Frequently asked questions on SPAM]] ----- ==== News ==== * 08-Mar-2024: Updated version of SPAM available (added PB20xx flux scale) [[https://ftp.strw.leidenuniv.nl/intema/spam/spam_20240308.tgz|here]]. * 27-Nov-2023: Updated version of SPAM available (minor bug fixes) [[https://ftp.strw.leidenuniv.nl/intema/spam/spam_20231025.tgz|here]]. * 13-Mar-2019: Check the [[https://ftp.strw.leidenuniv.nl/intema/spam/|spam ftp area]] for regular updates. * 16-Jan-2018: Updated version of SPAM available [[https://ftp.strw.leidenuniv.nl/intema/spam/archive/spam_20180116.tgz|here]]. * 22-Sep-2017: Made some small modifications to the install procedure. * 13-Sep-2017: Updates for almost all components of the SPAM installation, with several fixes and new functionality. * 21-May-2017: Moved homepage including SPAM webpage to new domain. * 06-Jan-2016: Update of webpage. Release of SPAM pipeline for GMRT. Full AIPS 31DEC13 binary install (LNX64 only), additional catalogs and more now available as single tarball. * 15-Jan-2016: Obit now available as binary install (LNX64 only). Added simple description how to run the pipeline. ----- ==== Older materials ==== [[https://safe.nrao.edu/wiki/bin/view/Main/HuibIntemaSpamTutorial|SPAM tutorial]] for the 3gc3 workshop "The Elephants In The Room", Port Alfred, South Africa, on Feb. 19, 2013. \\ [[https://ftp.strw.leidenuniv.nl/intema/spam/examples/spam_gmrt330_v01.py|SPAM example script]] for reducing GMRT 330 MHz data.

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