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  1. Data Management
  2. DM-5253

WCS match-fit iteration should use simple matching after first round


    • Type: Story
    • Status: To Do
    • Resolution: Unresolved
    • Fix Version/s: None
    • Component/s: meas_astrom
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      The current astrometric fitting iterates over a match-then-fit cycle using MatchOptimisticB each time. This matcher finds sets of stars (currently defaults to 6 stars per set), which is designed for finding a image's position and orientation in a large reference catalog, but this process is less suitable for when we already have a close alignment between the reference catalog and the source catalog on subsequent iterations of the match-fit cycle. This cycle also reduces the maximum match radius for subsequent iterations, which results in entire sets being rejected unnecessarily (which contributes to the instability of the fitting).

      MatchOptimisticB should instead be run once to find the overall location and rotation of the image in the reference catalog, then subsequent iterations should use a simplistic matcher as the fitter refines the WCS solution. If MatchOptimisticB fails on the first iteration, the image is likely unrecoverable even with subsequent iterations.


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                • Assignee:
                  krughoff Simon Krughoff
                  ctslater Colin Slater
                  Colin Slater, Russell Owen, Yusra AlSayyad
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