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  1. Data Management
  2. DM-21229

Investigate coadd/diffim platescale issues

    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 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
            Hide
            ebellm Eric Bellm added a comment -

            Looks good.

            Show
            ebellm Eric Bellm added a comment - Looks good.

              People

              • Assignee:
                sullivan Ian Sullivan
                Reporter:
                sullivan Ian Sullivan
                Reviewers:
                Eric Bellm
                Watchers:
                Eric Bellm, Ian Sullivan
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                • Created:
                  Updated:
                  Resolved:

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