In case anyone may find it useful, we’ve written a driver for forced photometry. It’s nothing special - it basically wraps ForcedPhotCcdTask in a BatchParallelTask, which enables forced photometry to be pooled out to multiple cores. Like ForcedPhotCcdTask, it performs forced photometry on calexp images using the catalogues produced by multiBandDriver on coadds as references. It can be found in our obs package here: https://github.com/GOTO-OBS/obs_goto/tree/master/python/lsst/obs/goto
It’s in two parts: forcedPhotDriver.py which calls forcedPhotCalexp.py. The latter is a small modification of forcedPhotCcd.py which identifies the tract covered by the calexp.
Comments welcome.
J