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  1. Data Management
  2. DM-17830

Investigate color-dependent offsets from ref cat in jointcal vs. meas_mosaic

    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None
    • Templates:
    • Story Points:
      12
    • Epic Link:
    • Sprint:
      DRP S19-3, DRP S19-4, DRP S19-5
    • Team:
      Data Release Production

      Description

      Now that jointcal applies the colorterms, we can look at much smaller differences in how meas_mosaic an jointcal match the to reference catalog. Some observations. There is a shift that jumps from 

      and the 3 mmag shift in the `w` principle component from jointcal to meas_mosaic  new_jointcal_gri  which is probably a manifestation of the offsets above (and just another way of looking at it)

      I don't know if these are significant or not. Will those with more expertise comment on whether this is a problem or not. 

      NOTE: these comparisons were done with meas_mosaic before DM-13054. If https://community.lsst.org/t/incorrect-reference-magnitude-errors-from-photocaltask/3581 affects meas_mosaic too, I propose we wait for Hsin-Fang Chiang's w_2019_06 run next week before we spend time thinking about this. 

        Attachments

        1. psfMagRefOffset_stars_only_internal.png
          psfMagRefOffset_stars_only_internal.png
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        2. psfMagRefOffset.png
          psfMagRefOffset.png
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        3. split_tract_AF1_design.png
          split_tract_AF1_design.png
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        4. split_tract_AM1.png
          split_tract_AM1.png
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        5. split_tract_AM1 (2).png
          split_tract_AM1 (2).png
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        6. split_tract_PA1.png
          split_tract_PA1.png
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        7. split_tract_reviewAM1.png
          split_tract_reviewAM1.png
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        8. split_tract_reviewPA1.png
          split_tract_reviewPA1.png
          51 kB
        9. wOffset_stars_only.png
          wOffset_stars_only.png
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        10. wOffset.png
          wOffset.png
          9 kB
        11. wStd_fit_std.png
          wStd_fit_std.png
          11 kB
        12. wStd.png
          wStd.png
          9 kB

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              • Assignee:
                yusra Yusra AlSayyad
                Reporter:
                yusra Yusra AlSayyad
                Reviewers:
                John Parejko
                Watchers:
                Eli Rykoff, Hsin-Fang Chiang, James Chiang, Jim Bosch, John Parejko, John Swinbank, Lauren MacArthur, Yusra AlSayyad
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                • Created:
                  Updated:
                  Resolved:

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