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  1. Data Management
  2. DM-21229

Investigate coadd/diffim platescale issues

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    Details

    • Story Points:
      6
    • Sprint:
      AP F19-2, AP F19-4 (2H September)
    • Team:
      Alert Production

      Description

      Building coadds and running ap_pipe with many different settings revealed some inconsistent behavior. In summary, the PSF FWHM used to compare the template and science image appears to still be based in pixel units in some places, which is a bug when they don't have the same platescale. There are also bugs in the option to convolve the science image rather than the template, which you would want to do if the seeing of the science image was better than that of the template. One is that the kernel attributes appear to still be calculated for the case where the template is convolved. The other appears to be an incorrect noise threshold, but that will require further investigation.

      This ticket covers the work spent investigating these issues, and the initial bug fixes.

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            sullivan Ian Sullivan created issue -
            sullivan Ian Sullivan made changes -
            Field Original Value New Value
            Epic Link DM-19979 [ 307530 ]
            sullivan Ian Sullivan made changes -
            Link This issue relates to DM-21217 [ DM-21217 ]
            sullivan Ian Sullivan made changes -
            Link This issue relates to DM-21230 [ DM-21230 ]
            swinbank John Swinbank made changes -
            Sprint AP F19-2 [ 940 ] AP F19-2, AP F19-4 (2H September) [ 940, 956 ]
            sullivan Ian Sullivan made changes -
            Status To Do [ 10001 ] In Progress [ 3 ]
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            sullivan Ian Sullivan added a comment -

            This is the ticket that covered my initial investigations into the coadd platescale issues, though most of the results ended up in DM-21230. I believe Gabor is taking care of the more in-depth code changes, so that leaves only a few minor changes on this ticket.

            The pull request is: https://github.com/lsst/pipe_tasks/pull/315

            Show
            sullivan Ian Sullivan added a comment - This is the ticket that covered my initial investigations into the coadd platescale issues, though most of the results ended up in DM-21230 . I believe Gabor is taking care of the more in-depth code changes, so that leaves only a few minor changes on this ticket. The pull request is: https://github.com/lsst/pipe_tasks/pull/315
            sullivan Ian Sullivan made changes -
            Reviewers Eric Bellm [ ebellm ]
            Status In Progress [ 3 ] In Review [ 10004 ]
            Hide
            ebellm Eric Bellm added a comment -

            Looks good.

            Show
            ebellm Eric Bellm added a comment - Looks good.
            ebellm Eric Bellm made changes -
            Status In Review [ 10004 ] Reviewed [ 10101 ]
            sullivan Ian Sullivan made changes -
            Resolution Done [ 10000 ]
            Status Reviewed [ 10101 ] Done [ 10002 ]
            swinbank John Swinbank made changes -
            Epic Link DM-19979 [ 307530 ] DM-21443 [ 423050 ]

              People

              Assignee:
              sullivan Ian Sullivan
              Reporter:
              sullivan Ian Sullivan
              Reviewers:
              Eric Bellm
              Watchers:
              Eric Bellm, Ian Sullivan
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                Dates

                Created:
                Updated:
                Resolved: