ChooseReferenceVisitTask

class lsst.pipe.tasks.matchBackgrounds.ChooseReferenceVisitTask(*args, **kwargs)

Bases: Task

Select a reference visit from a list of visits by minimizing a cost function

Notes

The reference exposure is chosen from the list of science exposures by minimizing a cost function that penalizes high background complexity (divergence from a plane), high variance, and low global coverage. The cost function is a weighted sum of these three metrics. The weights are set by the config parameters:

• bestRefWeightChi2

• bestRefWeightVariance

• bestRefWeightGlobalCoverage