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  1. Data Management
  2. DM-2280

The TAN_PIXELS cameraGeom coordinate system should be with respect to the center of the focal plane

    Details

    • Type: Bug
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: afw

      Description

      The TAN_PIXELS cameraGeom coordinate system (the position on a detector if there is no optical distortion) is presently defined with respect to the center of the detector – i.e. a star at the center of the detector will have the same position in PIXELS and TAN_PIXELS coordinates. That is a mistake. TAN_PIXELS should be defined with respect to the center of the focal plane, since it then reflects the effects of having optical distortion or not.

      Fixing this will help meas_astrom match stars. The effects of not fixing it are making the matcher search farther for a fit. As long as we allow sufficient offset in the matcher config the current system will work, but it is not ideal.

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                • Assignee:
                  rowen Russell Owen
                  Reporter:
                  rowen Russell Owen
                  Reviewers:
                  Bob Armstrong
                  Watchers:
                  Bob Armstrong, Paul Price, Robert Lupton, Russell Owen, Simon Krughoff
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                    Updated:
                    Resolved:

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