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  1. Data Management
  2. DM-9995

Develop DM requirements for processing crowded fields

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    • Story Points:
      20
    • Epic Link:
    • Sprint:
      DRP S17-6
    • Team:
      Data Release Production

      Description

      DM has no formal requirements on how well we will process crowded fields; this needs to be fixed.

      This is clearly a DRP science responsibility, but the DRP Scientist has no experience in this domain, so help/advice would be very welcome (I know at least Mario Juric, Zeljko Ivezic, Colin Slater, and Robert Lupton have more experience with this than I do).

      Here's my rough plan for how to start:

      • Find some examples of data at different galactic latitudes LSST, spanning the space of what LSST will observe (or the equivalent in stellar density due to other substructure). Ideally this would be HSC, DECam, or CFHT data.
      • See how well DM processing currently handles these datasets.
      • See how well a specialized crowded-field code handles these datasets.

      I'm hoping that will help to reveal the quantities we'll actually want to put requirements on.

      I do not anticipate starting this work until May 1 at the earliest; the April sprint is already quite overbooked for me.

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            Ciardi David Ciardi [X] (Inactive) added a comment -

            I think we need to be clear here on what the science goals are for the crowded field photometry which then feeds into Wil's comment about a specific and directly testable set of requirements.
            For example all of the following have different levels of difficulties:
            1. Real apparent magnitudes from the coadds (average over all epochs)
            2. Real apparent magnitudes from the calexps (time series)
            3. Relative photometry from the difference images
            Further, there are dependencies on brightness and color, and, of course, on the quality of the data - particularly, calexps to calexps

            Show
            Ciardi David Ciardi [X] (Inactive) added a comment - I think we need to be clear here on what the science goals are for the crowded field photometry which then feeds into Wil's comment about a specific and directly testable set of requirements. For example all of the following have different levels of difficulties: 1. Real apparent magnitudes from the coadds (average over all epochs) 2. Real apparent magnitudes from the calexps (time series) 3. Relative photometry from the difference images Further, there are dependencies on brightness and color, and, of course, on the quality of the data - particularly, calexps to calexps
            Hide
            jbosch Jim Bosch added a comment -

            I believe the SST has agreed that we're not going to try to do requirements (or even something softer, like "priorities") on this at all - we'll just try to report how well we are doing, and look to the science collaborations to start that effort.

            Show
            jbosch Jim Bosch added a comment - I believe the SST has agreed that we're not going to try to do requirements (or even something softer, like "priorities") on this at all - we'll just try to report how well we are doing, and look to the science collaborations to start that effort.

              People

              • Assignee:
                jbosch Jim Bosch
                Reporter:
                jbosch Jim Bosch
                Watchers:
                David Ciardi [X] (Inactive), Jim Bosch, Robert Gruendl, Tim Jenness
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