Setting up faceting

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5.3.18.3 Setting up faceting

Faceting will break the image into many small parts. This is invoked using facets:

gridmode            = ’widefield’       #  The kind gridding kernel to be used for FFT-based transforms
     wprojplanes    =          1        #  Number of w-projection planes for convolution
     facets         =          7        #  Number of facets along each axis (main image only)

In this example the image is broken into 49 (7 × 7) facets.

A reasonable value of facets is such that the image width of each facet does not need the w-term correction. The computation method with pure faceting is slow, so that w-projection is recommended

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