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| Paper: |
Developments in the LOFAR and SKA Calibration and Imaging Software |
| Volume: |
538, ADASS XXXII |
| Page: |
242 |
| Authors: |
Tammo Jan Dijkema; Maikel Lukkezen; Maik Nijhuis; André Offringa; Chiara Salvoni; Sebastiaan van der Tol; Mark de Wever; Stefan J. Wijnholds |
| DOI: |
10.26624/DYZS9341 |
| Abstract: |
We present recent developments in calibration and imaging software used
in particular for LOFAR. SKA’s Team Schaap develops this software. One of the goals
is integrating it into the SKA Science Data Processor. The software stack consists of
the top-level packages WSClean for imaging and DP3 for calibration and flagging. We
have made the software more modular, so that relevant parts of the software can also be
used by other packages. Recent improvements to WSClean include a faceting option,
which has enabled creating a 10 gigapixel image. Image domain gridding (IDG) allows
applying screen-based corrections. In the pipeline and calibration software DP3, we
have implemented support for baseline-dependent averaging (BDA), which can reduce
data volumes by an order of magnitude while retaining the image quality. The underlying beam library, EveryBeam, was made generic enough to support any beam model
that is expressed in spherical harmonics. This allows also to use recent LOFAR beam
simulations as well as SKA models. EveryBeam also allows passing arbitrary A-terms
for imaging direction-dependent effects other than beam models. |
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