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  1. DRP 2-D Pipeline
  2. PIPE2D-735

Offset in x direction with 2d subtraction

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    • Type: Task
    • Status: Done (View Workflow)
    • Priority: Normal
    • Resolution: Done
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
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      Description

      sky subtraction algorithm via reduceExposure seems to be off. I believe the offset is one 1 pixel and it happened after PIPE2D-714 was pushed. The dipole in the subtraction shown in the figure is noticeable in all the spots I have looked at. 

      The quality of `reduceArc` is nominally quite good: 

      reduceArc.fitDetectorMap INFO: Final fit: chi2=2557.440734 dof=2226 xRMS=0.017001 yRMS=0.017363 (0.001489 nm, 0.555814 km/s) from 1141/1336 lines
reduceArc.fitDetectorMap INFO: Fit quality from reserved lines: chi2=928.660422 xRMS=0.032308 yRMS=0.019853 (0.001702 nm, 0.635527 km/s) from 148 lines (10.0%)
reduceArc.fitDetectorMap INFO: Softening errors by 0.012173 pixels (0.001044 nm, 0.389680 km/s) to yield chi^2/dof=1
reduceArc.fitDetectorMap INFO: Softened fit: chi2=2224.912406 dof=2226 xRMS=0.017772 yRMS=0.018198 (0.001560 nm, 0.582562 km/s) from 1141/1484 lines
reduceArc.fitDetectorMap INFO: Softened fit quality from reserved lines: chi2=765.254110 xRMS=0.032082 yRMS=0.019945 (0.001710 nm, 0.638479 km/s) from 148 lines (10.0%)

      The detrened image I have been looking at is 

      /projects/HSC/PFS/Subaru/rerun/ncaplar/Feb_11_2021/rerun/ncaplar/detrend/calExp/2020-11-14/v034445/calExp-SA034445r1.fits 

      The 2dsubtracted image is at:

      /projects/HSC/PFS/Subaru/rerun/ncaplar/Feb_11_2021/rerun/ncaplar/calibs/sky2d_improved_dm/calExp/2020-11-14/v034445/calExp-SA034445r1.fits

       

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          Task - A task that needs to be done. PIPE2D-490 Evaluate the quality of the PSF fitting using the pipeline and decide future direction

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              • Assignee:
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                Reporter:
                ncaplar ncaplar
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