The data below shows the ash cloud from two different datasets, NOAA AVHRR and NASA MODIS sensors. These are around 1 hour apart. The AVHRR data shows the Brightness Temperature (BTD) from the TIR channels 4 and 5. Negative BTD represents fine ash content in the dispersing cloud. The MODIS data shows a decorrelation stretch of the TIR data from channels 28, 31 and 32, where 'purple' colors represent ash rich clouds.
NOAA AVHRR BTD data in Google Earth Engine, 01:13 UTC March 26, 2015
NOAA AVHRR Negative BTD data in Google Earth Engine, 01:13 UTC March 26, 2015
Decorrelation Stretch NASA MODIS TIR data in Google Earth Engine, 02:25 UTC March 26, 2015
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