DM-34309: Make tract-level PSF ellipticity plots #33
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| from lsst.analysis.drp.calcFunctors import CalcE2 | ||
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| plot_shapeSize_scatter: | ||
| # Plot a scatter plot of the values of (ixx*iyy - ixy^2)^(1/4) a measurement of |
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I'm not familiar with this particular size measure - can you document it somewhere (i.e. if it's a weak lensing thing, or something from DES, cite the relevant paper)? That probably belongs in Notes for the CalcShapeSize action.
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It is more of a GalSim thing, AFAIK. I've expanded the docstring for CalcShapeSize.
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If we're just talking about the expression in this comment, it's the same quantity we call "determinant radius".
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... good point. But I don't think we've documented our naming conventions anywhere, have we? This GalSim function does so fairly well, though (more so than the hsm one, I think): https://galsim-developers.github.io/GalSim/_build/html/_modules/galsim/gsobject.html#GSObject.calculateMomentRadius
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I don't think we have defined size precisely anywhere. I'd hope that the fractional residual quantities are much less sensitive to the exact definition though. For that matter, there are at least 2 different definitions of ellipticities and we don't define them clearly either.
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DM-34402 will add options to specify what definition of size and ellipticity to use (the default option would correspond to whatever they are now). And that could be one place where we define these consistently?
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Actually, we do have the TraceRadius and DeterminantRadius somewhere in our documentation. https://pipelines.lsst.io/v/v16-0/py-api/lsst.afw.geom.Quadrupole.html
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Creates the plots requested in the metrics monitoring meeting
https://confluence.lsstcorp.org/display/DM/DRP+Metrics+Monitoring+2022-03-21