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  1. Data Management
  2. DM-2792 Make the new astrometry task the default task
  3. DM-2793

Improve behavior of new matcher on highly distorted fields

    Details

    • Type: Technical task
    • Status: Won't Fix
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: meas_astrom
    • Labels:
      None
    • Templates:
    • Story Points:
      8
    • Sprint:
      Science Pipelines DM-W16-1
    • Team:
      Alert Production

      Description

      The optimistic matcher used by the new astrometry task probably does not handle highly distorted fields well. The issue is that it tries to match in X-Y space, and if that has significant curvature then the match is not optimal.

      I suggest matching in RA/Dec space, as per Tabur's original algorithm (on which this code is based). This is simple and easy to understand

      An alternative is to use the old technique of "undistorting" source and reference object positions before matching. This works, but is complicated, difficult to understand and adds an unnecessary step.

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              • Assignee:
                rowen Russell Owen
                Reporter:
                rowen Russell Owen
                Watchers:
                Russell Owen
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