Calculates an appropriate number of pixels and and cell size for imaging a measurement set. It uses the perfectly-illuminated circular aperture approximation to determine the field of view and 7 pixel per beam for the cell size.vis_xds (xarray.core.dataset. Dataset) – input Visibility Datasetmin_dish_diameter (float) – smallest antenna diameterimsize (list of ints) – number of pixels for each spatial dimension. cell (list of ints) – Cell size is arcseconds.