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  1. Data Management
  2. DM-6265

Audit DRP LDM-151 for correct handling of chromaticity

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      Correctly handling wavelength-dependent photometric and PSF effects is one of the biggest qualitative differences between the current state-of-the-art and what we have in mind for LSST, and that makes it easy to get wrong. We need to make sure all steps that produce high-quality fluxes or rely on high-quality PSFs have access to object colors and a reasonable approach to using them.

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            jbosch Jim Bosch added a comment -

            mfisherlevine, I created this issue a while ago to ensure that we had extra eyeballs looking at whether chromaticity was handled correctly in the DRP pipelines, and given your expressed interest in making sure photometric calibrations are correctly applied in DRP, I think you'd be a good candidate to do it.

            If you can keep an eye on whether chromatic dependent PSFs are handled well, too, that'd be great. I think the most important questions are whether we can actually infer an SED at every point we try to use a wavelength-dependent PSF model or flat-field, and whether we're producing any final outputs using too-preliminary SEDs or preliminary wavelength-dependent quantities.

            jbosch Jim Bosch added a comment - mfisherlevine , I created this issue a while ago to ensure that we had extra eyeballs looking at whether chromaticity was handled correctly in the DRP pipelines, and given your expressed interest in making sure photometric calibrations are correctly applied in DRP, I think you'd be a good candidate to do it. If you can keep an eye on whether chromatic dependent PSFs are handled well, too, that'd be great. I think the most important questions are whether we can actually infer an SED at every point we try to use a wavelength-dependent PSF model or flat-field, and whether we're producing any final outputs using too-preliminary SEDs or preliminary wavelength-dependent quantities.

            This ticket has been open for a few months now, and LDM-151 has evolved substantially since it was filed. jbosch, is it still relevant? mfisherlevine, is it on your todo list?

            swinbank John Swinbank added a comment - This ticket has been open for a few months now, and LDM-151 has evolved substantially since it was filed. jbosch , is it still relevant? mfisherlevine , is it on your todo list?
            jbosch Jim Bosch added a comment -

            Probably best to just close this.

            jbosch Jim Bosch added a comment - Probably best to just close this.

            Sorry it's taken me so long to get round to this, but if you'd still like it done I could take a look at it next week or the week after when I start properly at Princeton...

            mfisherlevine Merlin Fisher-Levine added a comment - Sorry it's taken me so long to get round to this, but if you'd still like it done I could take a look at it next week or the week after when I start properly at Princeton...

            mfisherlevine – no need, thanks. We've just closed it down.

            swinbank John Swinbank added a comment - mfisherlevine – no need, thanks. We've just closed it down.

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              mfisherlevine Merlin Fisher-Levine
              jbosch Jim Bosch
              Jim Bosch, John Swinbank, Merlin Fisher-Levine
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