IDL routine for Hot-Spot detection and effusion rate estimation UseRest Napoli 2008
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
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
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
Hot-Spot Detection Lombardo et al., 2004 (J. Volcanol. Geotherm. Res.) ch3 2005.0218.0556.n15.hdf ch4
Dual-band constrains: Tb Etna crater area is characterized by quite homogeneous basaltic coverage
Dual-band constrains: Tb
Auxiliary Data: Tb Misure di campagna con stazioni meteo Analisi di pixel adiacenti omogenei non radianti
Pixel quality check Acceptable solutions for Tlava and hlava in the Tb range GOOD Tlava and hlava trends associated to NO GOOD
Lava, cloud, and saturation masks
Alert e-mail
Effusion rate time series
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!