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ASKAP Science Data Processor software - ASKAPsoft Version 0.23.3

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Title ASKAP Science Data Processor software - ASKAPsoft Version 0.23.3
 
Creator Juan Guzman
 
Subject Astronomical and Space Sciences not elsewhere classified
 
Description ASKAPsoft, the ASKAP Science Data Processor, provides data processing functionality, including:

* Calibration
* Spectral line imaging
* Continuum imaging
* Source detection and generation of source catalogs
* Transient detection

ASKAPsoft is developed as a part of the CSIRO Australian Square Kilometre Array Pathfinder (ASKAP) Science Data Processor component. ASKAPsoft is a key component in the ASKAP system. It is the primary software for storing and processing raw data, and initiating the archiving of resulting science data products into the data archive (CASDA).

The processing pipelines within ASKAPsoft are largely written in C++ built on top of casacore and other third party libraries. The software is designed to be parallelised, where possible, for performance.

ASKAPsoft is designed to be built and executed in a standard Unix/Linux environment and core dependencies must be fulfilled by the platform. These include, but are not limited to, a C/C++/Fortran compiler, Make, Python 2.7, Java 7 and MPI. More specific dependencies are downloaded by the ASKAPsoft build system and are installed within the ASKAPsoft development tree. Specific to the Debian platform, after a standard installation of Debian Wheezy (7.x) the following packages will need to be installed with apt-get:

* g++
* gfortran
* openjdk-7-jdk
* python-dev
* flex
* bison
* openmpi-bin
* libopenmpi-dev
* libfreetype6-dev
* libpng12-dev

More information regarding the building, installation and running of the software can be found in the README file in the root of the file structure that forms this collection.

Source code can be accessed via the links in Related Materials section.

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A further patch release, with a number of small pipeline fixes, along
with several fixes to the processing software.

Processing:

* The imager would produce slightly different residual and restored
images when different values of nchanpercore were used. This was
due to the final gridding cycle not being synchronised
correctly. This has been fixed and the images are now indepenent of
nchanpercore.
* The tree reduction used by imager has been improved to have a
smaller memory footprint across the cores.
* The selavy component fitting is improved in the way negative
components are handled. Unless negative components are explicitly
accepted, if a fit results in one or more components being negative
then that fit will be rejected.
* The primary beam used by linmos now has a FWHM scaling by 1.09
lambda/D, which should be more accurate.
* The FITSImage interface (in Code/Base/accessors) will now report a
human-readable error message (rather than a number code) when an
error occurs.

Pipelines:

* CASDA uploads again include catalogues (which were left out due to
fixes in 0.23.1).
* There are new parameters CIMAGER_MAXUV and CCALIBRATOR_MAXUV that
allow the imposition of an upper limit to the uv values in the
continuum imaging/self-calibration.
* Parsets for the imager were erroneously getting a
"Cimager.Channels" selection that included the %w wildcard. This
will no longer happen (unless cimager is used).
* The default python module is now always loaded at the start of
slurm scripts, to avoid python conflicts due to a user's particular
environment.
* There are stronger checks on the number of cores allocated to
spectral-line imaging, ensuring that the number of channels must be
an exact multiple of the nchanpercore.
* The scaling on the beam-wise noise plots has been fixed, so that
the scaled MADFM should be closer to the standard deviation in the
absence of signal.
* Cube stats are now also generated for continuum-cube residual
images.
* Several scripts have been tidied up with the aim of avoiding
spurious errors (validationScience, for instance).
* The ASKAPsoft version was being left off FITS headers. This now
reflects the version string from the askapsoft module.
 
Publisher CSIRO
 
Contributor Matthew Whiting
Max Voronkov
Daniel Mitchell
Stephen Ord
Daniel Collins
Malte Marquarding
Paulus Lahur
Tony Maher
Ger Van Diepen
Keith Bannister
Xinyu Wu
Emil Lenc
Jonathan Khoo
Eric Bastholm
 
Date 2019-05-02
 
Type —
 
Format —
 
Identifier csiro:39526
 
Language —
 
Coverage —
 
Rights —