2018 WMO Volcanic Ash Intercomparison — validation for Grímsvötn (21-23 May 2011)

For the 2018 WMO Volcanic Ash Intercomparison, two experts at the University of Wisconsin independently identified volcanic clouds in multispectral infrared satellite imagery. Twenty times were selected for validation during this eruptive event. The images below show multispectral imagery with yellow and green polygons overlaid, representing the experts’ analysis of where ash is present. Please share your thoughts on the quality of this manual validation analysis by commenting on this post (i.e., is this analysis comparable to where you believe there is and is not volcanic ash?).

You can see the imagery for May 21-22 in this imagery viewer.

You can see the imagery for May 23 in this imagery viewer.

21 May 2011

22 May 2011

23 May 2011 (imagery viewer)