MAP_ROBUST Real
Robust weighting factor. A number between 0 and +infty.
Robust weighting gives the natural weight to UV cells whose natural
weight is lower than a given threshold. In contrast, if the natural
weight of the UV cell is larger than this threshold, the weight is set
to this (uniform) threshold. The UV cell size is defined by MAP_UVCELL
and the threshold value is in MAP_ROBUST.
0 means natural weighting, which is optimal for point sources. The Ro-
bust weighting factor controls the resolution: better resolution is ob-
tained for small values (at the expense of noise), resolution approach-
ing the natural weighting scheme for large values. Larger UV cell size
give higher angular resolution (but again more noise).
MAP_ROBUST around .5 to 1 is a good compromise between noise increase
and angular resolution.
Gildas manager
2023-06-01