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DM-34770: Compute PSF FWHM at the centroid of the footprint #87

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May 18, 2022
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DM-34770: Compute PSF FWHM at the centroid of the footprint #87

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10 changes: 4 additions & 6 deletions python/lsst/meas/deblender/sourceDeblendTask.py
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Original file line number Diff line number Diff line change
Expand Up @@ -275,10 +275,8 @@ def run(self, exposure, sources):
assert sources.getSchema() == self.schema
self.deblend(exposure, sources, psf)

def _getPsfFwhm(self, psf, bbox):
# It should be easier to get a PSF's fwhm;
# https://dev.lsstcorp.org/trac/ticket/3030
return psf.computeShape().getDeterminantRadius() * 2.35
def _getPsfFwhm(self, psf, position):
return psf.computeShape(position).getDeterminantRadius() * 2.35

@timeMethod
def deblend(self, exposure, srcs, psf):
Expand Down Expand Up @@ -363,8 +361,8 @@ def deblend(self, exposure, srcs, psf):
continue

nparents += 1
bb = fp.getBBox()
psf_fwhm = self._getPsfFwhm(psf, bb)
center = fp.getCentroid()
psf_fwhm = self._getPsfFwhm(psf, center)

self.log.trace('Parent %i: deblending %i peaks', int(src.getId()), len(pks))

Expand Down