Detecting Dust at Night with IR Window and Enhanced IR Window Imagery (Page 5 of 8)
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Detecting dust at night is more difficult because there are no visible images. Plus, on images of the IR window channel, the thermal difference between the background and the dust lessens or can disappear altogether. On this Meteosat IR window image, taken a few hours after sundown, there is little apparent trace of dust, but the blowing dust hazard is alive and well! Don't be fooled by nighttime images such as this one.
In this image of the same scene, we shift the enhancement of the IR window image to cover only the relatively warm temperatures of the airborne dust. Notice the dust streaks over land, similar to what was seen on the daytime images of the same scene.
We were able to improve the depiction of dust in this case, but often no amount of enhancement can show the forecasters dust at night. Dust at night is a very tough problem.
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