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IDL routine for Hot-Spot detection and effusion rate estimation
UseRest Napoli 2008
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antenna Local system PC scrub directory 1 AVHotRR Effusion Rate Raid
WEB, image gallery antenna Local system PC scrub directory 1 Raw data processing: Calibration Crop and Projection Permanent Archive Raid Storage Data Save data Processed in directory Srub 2 AVHotRR Effusion Rate
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AVHotRR System INPUT: files HDF in temperatura o radianza
Auxiliary data: Emissivity Background Temperature Azimuth Angle (optional) OUTPUT: Lava Temperature Lava surface Thermal flux Effusion rate
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Thermal model Issues Identification of the thermal anomaly (Alert)
(Tb) Lava Background (Tb) Tlava = Tc + Th flava Tlava Tb -> a-priori ! Issues Identification of the thermal anomaly (Alert) Dual-band constrains The effusion rate estimation
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Hot-Spot Detection Lombardo et al., 2004 (J. Volcanol. Geotherm. Res.)
ch n15.hdf ch4
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Dual-band constrains: Tb
Etna crater area is characterized by quite homogeneous basaltic coverage
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Dual-band constrains: Tb
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Auxiliary Data: Tb Misure di campagna con stazioni meteo
Analisi di pixel adiacenti omogenei non radianti
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Pixel quality check Acceptable solutions for Tlava and hlava in the Tb range GOOD Tlava and hlava trends associated to NO GOOD
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Lava, cloud, and saturation masks
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Alert
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Effusion rate time series
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Conclusions AVHRR data provide useful information for volcano thermal monitoring. The routine AVHotRR is a robust tool for hot-spot detection and effusion rate estimation AVHotRR has been tested during the 2006 and the ongoing 2008 Etna eruptions providing thermal parameters in Near Real Time THANK YOU!
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