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  1. Data Management
  2. DM-16466

Compare jointcal pixelScale "jacobian" with processCcd

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      While reviewing fgcmcal, I discovered SingleFrameJacobianPlugin, which performs a similar calculation to the new PixelScaleBoundedField. In addition to confirming that these two calculations get the same result, we should investigate how much the pixel scale changes, due to the astrometric jacobian, between processCcd and jointcal. We would expect there to be little difference between those, but we should measure it.

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          Story - Created by Jira Software - do not edit or delete. Issue type for a user story. DM-15431 Add Jacobian BoundedField accessor to SkyWcs

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            jbosch Jim Bosch added a comment -

            I'm calling this Won't Fix because I think the right approach is to have all source plugins whose results we ultimately care about (not just the one referenced here) run after final astrometric and photometric calibration, so I don't care much about how the pixel scale in particular varies before and after those calibrations, at least not directly. If a bad preliminary estimate of the pixel scale (or anything else) gets in the way of something we have to do before the final calibrations, then we can open a new ticket with a more specific goal.

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            jbosch Jim Bosch added a comment - I'm calling this Won't Fix because I think the right approach is to have all source plugins whose results we ultimately care about (not just the one referenced here) run after final astrometric and photometric calibration, so I don't care much about how the pixel scale in particular varies before and after those calibrations, at least not directly. If a bad preliminary estimate of the pixel scale (or anything else) gets in the way of something we have to do before the final calibrations, then we can open a new ticket with a more specific goal.

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              Assignee:
              Parejkoj John Parejko
              Reporter:
              Parejkoj John Parejko
              Watchers:
              Eli Rykoff, Jim Bosch, John Parejko, John Swinbank
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