Publication Date:
2022-06-14
Description:
The Multispectral Instrument (MSI) and the Operational Land Imager (OLI), respectively
onboard Sentinel-2A/2B and Landsat 8 satellites, thanks to their features especially in terms of
spatial/spectral resolution, represents two important instruments for investigating thermal volcanic
activity from space. In this study, we used data from those sensors to test an original multichannel
algorithm, which aims at mapping volcanic thermal anomalies at a global scale. The algorithm,
named Normalized Hotspot Indices (NHI), combines two normalized indices, analyzing near infrared
(NIR) and short wave infrared (SWIR) radiances, to identify hotspot pixels in daylight conditions.
Results, achieved studying a number of active volcanoes located in di erent geographic areas and
characterized by a di erent eruptive behavior, demonstrated the NHI capacity in mapping both
subtle and more intense volcanic thermal anomalies despite some limitations (e.g., missed detections
because of clouds/volcanic plumes). In addition, the study shows that the performance of NHI might
be further increased using some additional spectral/spatial tests, in view of a possible usage of this
algorithm within a known multi-temporal scheme of satellite data analysis. The low processing times
and the straight forth exportability to data from other sensors make NHI, which is sensitive even
to other high temperature sources, suited for mapping hot volcanic targets integrating information
provided by current and well-established satellite-based volcanoes monitoring systems.
Description:
Published
Description:
id 2876
Description:
2V. Struttura e sistema di alimentazione dei vulcani
Description:
4V. Processi pre-eruttivi
Description:
5V. Processi eruttivi e post-eruttivi
Description:
6V. Pericolosità vulcanica e contributi alla stima del rischio
Description:
1IT. Reti di monitoraggio e sorveglianza
Description:
5IT. Osservazioni satellitari
Description:
JCR Journal
Keywords:
04.08. Volcanology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
