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| Paper: |
The VLA Sky Survey |
| Volume: |
541, ADASS XXXIII |
| Page: |
416 |
| Authors: |
Mark Lacy; The VLASS Team |
| DOI: |
10.26624/BDYI3779 |
| Abstract: |
The VLA Sky Survey (VLASS) is a multi-epoch radio survey at 2-4 GHz
covering the entire sky visible to the VLA, with a resolution of 2.5-arcsec. VLASS is
observed in “on the fly” (OTF) mode with the antennas rastered on the sky in sets of
10x4 deg tiles in at least three epochs. The combination of the high angular resolution of VLASS and the OTF observing mode produce significant challenges for data
processing. Although “Quick Look” images are made within ∼1 month of observing,
we are exploring new algorithms involving GPUs to speed the gridding of the observed
visibilities in order to make higher accuracy images for the final processing. The large
computing resources needed for VLASS has led to us develop methods for processing
on remote clusters in order to complete the survey imaging in a timely fashion. Finally,
the scale of the survey also means that accessing and visualizing the 35,500 individual
images of each type per epoch is itself a challenge, both for the VLASS quality assessment (QA) team and for our users. We discuss the data challenges associated with
VLASS and the solutions we are adopting, including algorithmic and machine learning
approaches to QA and VO services and applications for data access and visualization. |
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