Lang is in town. Bovy, Lang, and I discussed image modeling, in preparation for Bovy's shot at multi-wavelength simultaneous modeling for the construction of astrometric measurements or an astrometric catalog. We argued about what freedom to give the point-spread function: Use the survey- or observation-provided point-spread function, fit the provided point-spread function, or learn the point-spread function from the data. I lean towards the latter, despite the fact that it involves reinventing the wheel, but I lean that way because otherwise we have to write specialized modules, one for each input data set, to deal with the point-spread function analysis available.
Lang and I also discussed getting the main Astrometry.net paper done and submitted.