October 9 2012 Calvin Liang Stephanie Weiss NGAS AampDP Path Forward to Investigate NCC EDR Issues Proposed steps to investigate NCC issue Collect SVDNB GDNBO and IVOBC granules from August 1617 ID: 259963
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NCC Status
October 9, 2012
Calvin Liang
Stephanie Weiss
NGAS A&DPSlide2
Path Forward to Investigate NCC EDR Issues
Proposed steps to investigate NCC issue:
Collect SVDNB, GDNBO, and IVOBC granules from August 16-17
th
, 2012 – Around new moonConstruct stray light correction lookup table (LUT) from new moon dataApply stray light correction LUT to new moon granules using NGAS stray light correction algorithmDetermine best functional fit to corrected radiances and account for night glow. (In work right now)Produce a new GVVSSE/GVVSLE LUT based on the new functional fits.Remove stray light in problematic granulesRun the latest version of the NCC EDR algorithm in ADL on stray light corrected granules (results are shown using ADL 3.1)Inspect output to determine whether some of the problems identified in the granules go away with stray light correctionIf it is found that fixing stray light does not completely solve the problems, then we will delve into the NCC EDR algorithm logic
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Completed
In Work
PlannedSlide3
Radiance
vs Solar Zenith After
Stray Light Correction
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Noise floor 7e-11Current SZA cutoff = 105Straylight removedSome overcorrection but very little
C. Liang, NGASSlide4
VNCCO-npp-d20120612-t0012064-e0013407-b03229
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For mix solar/lunar conditions,
straylight
corrected LUT improves image.Slide5
VNCCO-npp-d20120612-t0013301-e0015079-b03229
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For mix solar/lunar conditions,
straylight
corrected LUT improves image.Slide6
VNCCO-npp-d20120612-t0014555-e0016351-b03229
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For mix solar/lunar conditions,
straylight
corrected LUT improves image.Slide7
VNCCO-npp-d20120611-t2357471-e2359320-b03229
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For purely lunar conditions,
straylight
corrected LUT does not improve imageOut of bound values (65528)Slide8
SummaryFor mixed solar and lunar conditions, i.e. when lunar and solar angles are between 0 and 105, the stray light corrected LUT seems to improve the contrast in images
The application of the straylight corrected NCC table does not seem to fix the problem of NCC producing an abundance of “out of bound” values
Will likely need to delve into the code to investigate this further
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