Abstract: Piff models the point-spread function (PSF) across multiple detectors in the full field of view (FOV). Models can be built in chip coordinates or in sky coordinates if needed to account for the effects of astrometric distortion. The software can fit in either real or Fourier space, and can identify and excise outlier stars that are poor exemplars of the PSF according to some metric.
Credit: Jarvis, Mike; Meyers, Josh; Leget,Pierre-Francois; Davis, Chris
https://ui.adsabs.harvard.edu/abs/2021M ... J/abstract