Adjusted data Comparison for DayNight passes on 2222013 Night and Day passes for 222 Cloud Type Mask for 222 Purple Clear any other color cloud The cloud field for the Day passes looks reasonable The Night case looks like its missing a lot especially in the Northwest corner ID: 780867
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Slide1
Snow Field over Kansas
2/22 – 2/24 2013
Adjusted data
Slide2Comparison for Day/Night passes on 2/22/2013
Slide3Night and Day passes for 2/22
Slide4Cloud Type Mask for 2/22
Purple = Clear; any other color = cloud
The cloud field for the Day passes looks reasonable. The Night case looks like it’s missing a lot, especially in the Northwest corner. I’m expecting some contamination.
Slide5Ranges for granule 0818:
Scat angle: 94.0° -- 116.2°
Zen angle: 58.75° –61.51°
Ranges for granule 1939Scat angle: 130.9° –137.6°
Zen angle: 48.88° –51.87°
Ranges for granule 1941
Scat angle: 130.9° –133.6°
Zen angle: 50.94° –51.47°
Day and night peak at different reflectance values. However, peaks for day are very close, as is night peaks. Not sure if cloud contamination is effecting the night case.
Moon phase 40-49°
Original
Slide6Comparison between VIIRS lunar phase angle only and the adjusted data
The peaks of the night passes have been shifted slightly to the left (smaller reflectance values), bring the day and night peaks closer together.
Slide7All day, and all night curves added together.
Both curves about same width, but Day peaks at a lower reflectance value than night curve. Not sure if this could be due to cloud contamination, or something else.
Original
Slide8Comparison between VIIRS lunar phase angle only and the adjusted data
The shift in the night pass peak is easier to see with the totals. The curve is about the same width, but the peak is closer to the day peak.
Slide9Comparison between 2/22 Day Passes and 2/23 Night Passes
Slide10Runs with 2/23 night Pass 0759 that was originally tossed out due to glint
Decided to stick with this one since a) the total curve is more comparable to the others and b) the phase angle is in the range where it would be adjusted
Slide11Ranges for granule 1939
Scat angle: 130.9° –137.6°
Zen angle: 48.88° –51.87°
Ranges for granule 1941Scat angle: 130.9° –133.6°
Zen angle: 50.94° –51.47°
Ranges for granule 0759:
Scat angle: 85.96 ° – 99.97°
Zen angle: 47.87° – 51.03°
Day curves peaks are close. The night curve peaks are slightly more apart. Definite difference between Day and Night peaks.
Moon phase 30-39°
Original
Slide12Comparison between VIIRS lunar phase angle only and the adjusted data
Slide13Night and Day curves similar in width, but the peaks are definitely different.
In the edge night image, the curve was wider, but peaked at the same reflectance as the Day curve.
Could offset be due to glint angle?
Original
Slide14Comparison between VIIRS lunar phase angle only and the adjusted data
Very little difference is seen between the adjusted and unadjusted night curves. A check of the night pass granule shows a Moon phase angle of 30.63° Since the adjustment curve doesn’t start until 30
°, the adjustment to the night curve would be minimum.
Slide15Since the rest of the Kansas set has moon phase angles between 10° and 30.63°, there should be little to no change with the new adjustments.
Slides with additional total curves will be added using the VIIRS phase angle only.
Slide16Comparison between VIIRS lunar phase angle only and the adjusted data
Slide17Comparison between VIIRS lunar phase angle only and the adjusted data