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  1. Data Management
  2. DM-22147

Add python-only function to ChebyshevBoundedField to approximate another BoundedField

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: afw
    • Labels:
      None
    • Story Points:
      2
    • Sprint:
      DRP F19-6 (Nov)
    • Team:
      Data Release Production

      Description

      At the current moment the PixelAreaBoundedField (and the PixelScaleBoundedField that it is replacing, see RFC-644) are too slow (by a couple orders of magnitude) to use in coaddition via a PhotoCalib. Jim Bosch says that this is a non-trivial fix (DM-22071).

      However, for many purposes, it is possible to use a ChebyshevBoundedField to approximate a PixelAreaBoundedField (or other BoundedField). Provided the field to approximate is smooth, preliminary tests show that (e.g.) a typical HSC WCS can be approximated at the 1e-7 level with plenty of speed, which is sufficient for use in a PhotoCalib.

      This ticket is to add a python-only approxBoundedField method to ChebyshevBoundedField. Tests will be written by approximating PixelAreaBoundedField (the primary use case) so this requires DM-22070 to be completed first.

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            erykoff Eli Rykoff added a comment - PR is https://github.com/lsst/afw/pull/501 (and miraculously showing on the sidebar!) and jenkins is https://ci.lsst.codes/blue/organizations/jenkins/stack-os-matrix/detail/stack-os-matrix/30778/pipeline

              People

              • Assignee:
                erykoff Eli Rykoff
                Reporter:
                erykoff Eli Rykoff
                Reviewers:
                Jim Bosch
                Watchers:
                Eli Rykoff, Jim Bosch
              • Votes:
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                Dates

                • Created:
                  Updated:
                  Resolved: