ICal-related Liens
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Last modified: F. Masci, October 18, 2010


1. level 1b frame streak detector (edge-to-edge only for conservatism?)
   ---> really needed? Fat streaks will be hard to tag. Nonetheless,
   outlier-rejection in the coadder does a pretty good job if the depth
   is >~ 4 frames.

2. correct w1,w2 channel/amplifier bias fluctuations? (analysis pending).
   Checkerbord patterns too?  

3. proper treatment of pixel uncertainties under droop corrections

4. pixel de-saturation algorithm using saturation encoding 
   - Note: towards W3 (or W4) warm-up phase, saturation encoding stopped
     working for W2 (Pedro - wells saturating before max A/D?).

5. running scan-flat "delta" corrections: on top of static flats, before
   final skyoffset calibration (analysis pending).

6. if retain skyoffset calibration (following analysis from 5), convert 
   to single-frame step moving median. Requires a re-write of tempcal.
   
7. static bad-pixel check (or residual check) by searching for correlations
   in source space at same frame x,y. Also use N/M metric in mdex for
   noisy/transient pixels. Thankfully, dynamic masking handles such cases
   for stretches of 9 consecutive frames.
   - reasess changes due to warmup. Note FEB offset was changed for W1,W2 
     to reduce bad-pixel count. Pedro has provided binary bad-pixel maps for
     W3 where there was _no_ FEB offset adjustment.

8. flat-field (and possibly w3,w4 dark) picking infrastructure:
    - vs. period of application (e.g., saw that w3,w4 flats changed structure
      around Feb 1,2010). 
    - vs. zodi color? (analysis pending). Best done using stacking method.
    - vs. time since anneal using coarse windows? Do we want to salvage data?
      Edge rolloff/glows seen in W3,W4 within <~ 1500 sec from heater warm-up,
      so just throw away?)
    - along with darks, handle warmup phase (during/after)

9. continue monitoring low-frequency responsivity structure (need to isolate
   non-FOV-distortion residuals if plan to use low-nu maps in production).

10. refine droop corrections:
    - adapatively inflate/deflate threshold for split corrections according 
      to background level. Now: for high backgrounds => unnecessary
      split correction is applied => mess's up global Q-to-Q droop correction
      using ref pixels. E.G. 04097b044, 01106b014, 03292a094, 02852a136,
      02852a130 (w3)
    - consider not applying split-droop correction if actual correction is
      "high" due to confusing structure in frame?
    - quadrant droop gradients (e.g., Cat's Eye in touchstone field!). See
      analysis charts and characterization code.
    - temperature dependencies during warmup?
    - **NOTE: for non-nominal exptimes in warm-up, can't key off L0 
      sat values >=32,753.
      
11. single-frame glitch detector needs tuning for w1,w2 [see testing
    in coadd_jingwen for with/without glitch masking]. This is needed to
    tag CRs for low-depth regions in coadds where the temporal method is
    unreliable.
    - Note: FM has an isolated program just for glitch-det testing.

12. continue to monitor dark and flat residuals from super-median/col-cuts  
    of level 1b products from ops.
    - apply delta darks and/or delta flat to static cals in future if necessary.
    - if really bad, consider masking edges for prelim Image Atlas/multiframe
      photom.

13. linearity calibration: 
    - reanalyse on-orbit experiment using single frame extractions:
      improved registration expected to make a difference.
    - continue to analyse WISE vs. IRAC+MIPS24 photom. (NEP and SEP and more)
    - continue to monitor CMDs (from science applications)
      Note: Roc saw big curvature in W2 vs. Ks - W2 in prelem FPG test fields
    - continue to monitor MAGZP's vs flux for all bands
    - idea if time permits: derive NL, dark + relative flat from one super
      self-cal fit?
    - complete linearity report for history's sake.

14. continue chi-square sanity checks from multiframe WPhot in lieu of
    cal changes above.
    
15. fun exercises (if time):
    - explore time-history of single pixels throughout mission, with the
      goal of identifying transients (e.g., latents, glitches, ...). Can
      apply 1D-filtering methods.
    - check or monitor long-term dark level/stability from relative variation
      of expected (model) background from ecliptic pole-to-equator. E.g:
      [S_eq - D] / [S_pole - D] ~ zodi_eq / zodi_pole.


Multiframe (frame co-addition only)
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1. optimize frame filtering:
   - moon-mask optimization
   - badly drooped (or badly corrected) frames(?) E.g., worst of Cat's eye.
   - dynacal failures - if not run or bad correction applied (any way to tell?)
   
2. Properly handle throughput matching of frames with different exptimes.
   Automatic nominal-saturated pixel replacement with short exptime data?
   Ensure follows through to wphot.

3. more QA metadata for headers of Atlas Image products? 

4. correlated-noise correction factors to support photometry off
   co-adds [for explanatory supplement]. Simulation code written.

5. use multi-epoch data to mitigate latents in coadds (especially short term
   w3,w4 latents).

6. any way to suppress short-term latents at some |elat| < max using
   temporal matched filtering in stacked pixel space?
   
7. analysis: jack-knifing at poles to explore degree of systematics
   and dependence of co-add noise on depth-of-coverage, goal is 1/sqrt(N).