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Vulkaner
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Article Images
Øvelse 2: Påvisning af hotspots og røgsøjler - fortsat
 
 
 
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 HI-RES JPEG (Size: 96 kb)
MODIS Bands 31 and 32 are used to detect a volcanic plume and distinguish it from clouds. The bands range from 10.780 - 11.280 μm (31) and 11.770 - 12.270 μm (32), and correspond to the thermal IR.

Credits: USGS
 
 
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 HI-RES JPEG (Size: 135 kb)
Band subtraction (Band 31 minus band 32) for ash detection of the MODIS image of 24 July 2001. The difference between the brightness temperatures usually results in negative values for volcanic plumes containing ash (dark), and positive values for atmospheric clouds (light).

Credits: USGS
 
 
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 HI-RES JPEG (Size: 682 kb)
Band subtraction (Band 31 - band 32) for ash detection of the MODIS image of 23 July 2001. The difference between the brightness temperatures usually shows negative values for volcanic plumes containing ash (dark) and positive values for atmospheric clouds (light).

Credits: USGS
 


Etna
Etna
Overvågning af vulkanske hotspots og røgsøjler
Introduktion til arbejdsarketØvelse 1: Undersøgelse af vulkanenØvelse 2: Påvisning af hotspots og røgsøjlerØvelse 3: Overvågning af en røgsøjle - animation
Eduspace - Download
Etna_MODIS.zip
Eduspace - Software
LEOWorks 3LEOWorks 3 Tutorial
Related links
Hot spot monitoring with MODISVolcanic Ash Advisory Centres
 
 
 
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