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• jointcal shall be runnable as a command-line Task that takes the src and ref_cat datasets as input and produces (at least) a wcs and photoCalib dataset as outputs, which provide updated astrometric and photometric calibrations.
• jointcal shall perform a different fit for each tract, and allow multiple tracts to be run in single invocation (at least in serial, which is all meas_mosaic does).  Some visits may thus be processed with multiple tracts.
• jointcal shall fit models that have a level of sophistication similar to those in meas_mosaic (if it fits simpler models, it will be because the tests below demonstrate that they are sufficient to generate similar-quality results).  That involves:
  • astrometry: a full-focal-plane polynomial transform for each visit composed with a rotation and translation for each CCD (which is the same for all visits in the fit).
  • photometry: a full-focal-plane polynomial scaling for each visit multiplied by a constant scaling for each CCD (which is the same for all visits in the fit) and the determinant of the Jacobian of the astrometric model.

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