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  1. Data Management
  2. DM-13867

Transformations between FIELD_ANGLE and FOCAL_PLANE do not invert each other in obs_lsstSim

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    Details

    • Type: Bug
    • Status: Won't Fix
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: afw, obs_lsstSim
    • Labels:
      None
    • Team:
      System Management

      Description

      If I use obs_lsstSim to construct a FOCAL_PLANE to FIELD_ANGLE transformation, it does not invert FOCAL_PLANE to FIELD_ANGLE (curiously, the inversion does seem to work going the other way).

      The attached script will reproduce the failure when run against the w_2018_09 version of afw and obs_lsstSim.

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          danielsf Scott Daniel added a comment -

          I was testing on values of FIELD_ANGLE that are ~ 0.1 radians. If I reduce that by an order of magnitude, the failure goes away. Clearly, this is just a problem with excessively large values of FIELD_ANGLE. I suspect this is not actually a bug. Sorry for the confusion.

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          danielsf Scott Daniel added a comment - I was testing on values of FIELD_ANGLE that are ~ 0.1 radians. If I reduce that by an order of magnitude, the failure goes away. Clearly, this is just a problem with excessively large values of FIELD_ANGLE. I suspect this is not actually a bug. Sorry for the confusion.
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          danielsf Scott Daniel added a comment -

          I don't actually think this is a bug. My first test was ill-posed.

          Show
          danielsf Scott Daniel added a comment - I don't actually think this is a bug. My first test was ill-posed.

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            Reporter:
            danielsf Scott Daniel
            Watchers:
            Scott Daniel
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