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validation.md

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Validation

The validation plots that are created are simple and aim to provide a quality assessment at a quick glance. An RMS image and corresponding source component catalogue are the base data products derived from the ASKAP data that are supplied to the routine.

flint requires a set of reference catalogues to be present for some stages of operation, the obvious being the validation plots described above. In some computing environments (e.g. HPC) network access to external services are blocked. To avoid these issues flint has a built in utility to download the reference catalogues it expected from vizier and write them to a specified user directory. See:

flint_catalogue download --help

The parent directory that contains these cataloguues should be provided to the appropriate tasks when appropriate.

In the current flint package these catalogues (and their expected columns) are:

  • ICRF
Catalogue(
    survey="ICRF",
    file_name="ICRF.fits",
    freq=1e9,
    ra_col="RAJ2000",
    dec_col="DEJ2000",
    name_col="ICRF",
    flux_col="None",
    maj_col="None",
    min_col="None",
    pa_col="None",
    vizier_id="I/323/icrf2",
)
  • NVSS
Catalogue(
    survey="NVSS",
    file_name="NVSS.fits",
    name_col="NVSS",
    freq=1.4e9,
    ra_col="RAJ2000",
    dec_col="DEJ2000",
    flux_col="S1.4",
    maj_col="MajAxis",
    min_col="MinAxis",
    pa_col="PA",
    vizier_id="VIII/65/nvss",
)
  • SUMSS
Catalogue(
    survey="SUMSS",
    file_name="SUMSS.fits",
    freq=8.43e8,
    ra_col="RAJ2000",
    dec_col="DEJ2000",
    name_col="Mosaic",
    flux_col="St",
    maj_col="dMajAxis",
    min_col="dMinAxis",
    pa_col="dPA",
    vizier_id="VIII/81B/sumss212",
)
  • RACS-LOW
Catalogue(
    file_name="racs-low.fits",
    survey="RACS-LOW",
    freq=887.56e6,
    ra_col="RAJ2000",
    dec_col="DEJ2000",
    name_col="GID",
    flux_col="Ftot",
    maj_col="amaj",
    min_col="bmin",
    pa_col="PA",
    vizier_id="J/other/PASA/38.58/gausscut",
)

The known filename is used to find the appropriate catalogue and its full path, and are appropriately named when using the flint_catalogue download tool.