warping of psf exp results in odd variance

LSSTDESC / descwl-shear-sims

simple simulations for testing weak lensing shear measurement

BSD 3-Clause "New" or "Revised" License

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Closed esheldon closed 3 years ago

esheldon commented 3 years ago

The psf exp warp produces a variance 30% smaller.

All the same code is used, the main difference I see is that the psf image gets border that is masked

esheldon commented 3 years ago

Note this doesn't affect the shear recovery in my tests, but we should figure it out

esheldon commented 3 years ago

made a psf coadd that doesn't get any masking, still happens

esheldon commented 3 years ago

fixed in latest descwl_coadd