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  1. Data Management
  2. DM-9411

Investigate effects of bounding box setting for adaptive moments

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: meas_base
    • Labels:
      None
    • Templates:
    • Story Points:
      4
    • Epic Link:
    • Sprint:
      DRP S17-3
    • Team:
      Data Release Production

      Description

      As Bob Armstrong noted in DM-6463:

      for LSST sdss shape chooses a slightly different footprint. See computeAdaptiveMomentsBBox in SdssShape.cc.

      Bob recalls seeing some effects due to this change, and the commit message of the changeset (made on the LSST stack but not on the HSC stack) states:

      Rewrite set_amom_bbox using afw::geom operators
      This changes results slightly in lsst_dm_stack_demo (as the the region of
      pixels used in the fit can differ by 1 pixel due to different rounding).

      This ticket is to more deeply investigate the effects of this change and, in particular, see if it contributes to differences seen between the stacks: e.g. the increasing with magnitude offset of the SDSS trace radii:

      Of note, the difference does not show up in a comparison of the psf model trace radii:

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              • Assignee:
                lauren Lauren MacArthur
                Reporter:
                lauren Lauren MacArthur
                Reviewers:
                Bob Armstrong
                Watchers:
                Bob Armstrong, Lauren MacArthur
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                • Created:
                  Updated:
                  Resolved:

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