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  1. Data Management
  2. DM-19976

Summarize results from S19 work on DCR with variable PSFs

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: None
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    • Story Points:
      6
    • Epic Link:
    • Sprint:
      AP F19-1, AP F19-2
    • Team:
      Alert Production

      Description

      Through the S19 cycle, Ian Sullivan has performed a number of experiments to understand the range of seeing conditions over which his DCR mitigation approach can be usefully applied without further extension. Summarise these in a brief DMTN that we can (for example) supply to LSST leadership to inform future decisions about survey strategy, requirements for future development of this code, etc.

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          Hide
          sullivan Ian Sullivan added a comment -

          Draft (and eventually final) technote can be found at: https://dmtn-121.lsst.io

          Show
          sullivan Ian Sullivan added a comment - Draft (and eventually final) technote can be found at: https://dmtn-121.lsst.io
          Hide
          sullivan Ian Sullivan added a comment -

          The draft of the technote is at https://dmtn-121.lsst.io

          I accidentally pushed the draft to the master branch, so please just look for it there. I can do future edits on a ticket branch, if you'd like.

          Show
          sullivan Ian Sullivan added a comment - The draft of the technote is at https://dmtn-121.lsst.io I accidentally pushed the draft to the master branch, so please just look for it there. I can do future edits on a ticket branch, if you'd like.
          Hide
          ebellm Eric Bellm added a comment -

          I think the technical work here is well-summarized, I'd just suggest providing a little more context in the introduction and more conclusions throughout. The motivating question we are trying to answer is "Over what range of variable seeing does the constant-seeing DCR algorithm show minimal degradation?"

          In Section 2 I'd place the seeing numbers in a bit of context from the OpSim runs: what are the 10/25/50/75/90th percentile seeing values from OpSim?

          In Section 3.1 I'd add a sentence suggesting a seeing range which you'd judge adequate--maybe 0.6-0.88"? And I'd add the comment that you made to use that this measure doesn't really capture the quality of the template, motivating the visual examination in Section 3.2

          In Section 3.2, again I'd suggest identifying a "tolerable" regime for the variable seeing case, and emphasize that failure to correct this means the deep coadd is quite bad even in the constant seeing case.

          In the conclusions I'd add a connection back to the survey strategy--what fraction of images are usable for template construction using the constant-seeing algorithm given the results above?

          Show
          ebellm Eric Bellm added a comment - I think the technical work here is well-summarized, I'd just suggest providing a little more context in the introduction and more conclusions throughout. The motivating question we are trying to answer is "Over what range of variable seeing does the constant-seeing DCR algorithm show minimal degradation?" In Section 2 I'd place the seeing numbers in a bit of context from the OpSim runs: what are the 10/25/50/75/90th percentile seeing values from OpSim? In Section 3.1 I'd add a sentence suggesting a seeing range which you'd judge adequate--maybe 0.6-0.88"? And I'd add the comment that you made to use that this measure doesn't really capture the quality of the template, motivating the visual examination in Section 3.2 In Section 3.2, again I'd suggest identifying a "tolerable" regime for the variable seeing case, and emphasize that failure to correct this means the deep coadd is quite bad even in the constant seeing case. In the conclusions I'd add a connection back to the survey strategy--what fraction of images are usable for template construction using the constant-seeing algorithm given the results above?
          Hide
          sullivan Ian Sullivan added a comment -

          Eric Bellm please take another look. I've expanded the discussion in the sections you requested, and added new analysis of the number of usable images given the seeing constraints set in this tech note and the OpSim run I've been using.

           

          Show
          sullivan Ian Sullivan added a comment - Eric Bellm please take another look. I've expanded the discussion in the sections you requested, and added new analysis of the number of usable images given the seeing constraints set in this tech note and the OpSim run I've been using.  
          Hide
          ebellm Eric Bellm added a comment -

          Hi Ian Sullivan, looks very good-just one more very small request-could you also overplot on Figure 4 the normalized cumulative distribution function for the OpSIM seeing distribution, with a second 0-1 y-axis?

          I'll go ahead and mark as reviewed and you can merge when ready.

          Show
          ebellm Eric Bellm added a comment - Hi Ian Sullivan , looks very good- just one more very small request -could you also overplot on Figure 4 the normalized cumulative distribution function for the OpSIM seeing distribution, with a second 0-1 y-axis? I'll go ahead and mark as reviewed and you can merge when ready.
          Hide
          sullivan Ian Sullivan added a comment -

          I've updated Figure 4, as requested.

          Show
          sullivan Ian Sullivan added a comment - I've updated Figure 4, as requested.

            People

            • Assignee:
              sullivan Ian Sullivan
              Reporter:
              swinbank John Swinbank
              Reviewers:
              Eric Bellm, John Swinbank
              Watchers:
              Eric Bellm, Ian Sullivan, John Swinbank
            • Votes:
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              • Created:
                Updated:
                Resolved:

                Summary Panel