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NCC Status NCC Status

NCC Status - PowerPoint Presentation

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NCC Status - PPT Presentation

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

light stray lut corrected stray light corrected lut ncc solar straylight lunar conditions npp image correction vncco granules b03229 improves mix d20120612

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Slide1

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

2

Completed

In Work

PlannedSlide3

Radiance

vs Solar Zenith After

Stray Light Correction

3

Noise floor 7e-11Current SZA cutoff = 105Straylight removedSome overcorrection but very little

C. Liang, NGASSlide4

VNCCO-npp-d20120612-t0012064-e0013407-b03229

4

For mix solar/lunar conditions,

straylight

corrected LUT improves image.Slide5

VNCCO-npp-d20120612-t0013301-e0015079-b03229

5

For mix solar/lunar conditions,

straylight

corrected LUT improves image.Slide6

VNCCO-npp-d20120612-t0014555-e0016351-b03229

6

For mix solar/lunar conditions,

straylight

corrected LUT improves image.Slide7

VNCCO-npp-d20120611-t2357471-e2359320-b03229

7

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

8Slide9