Publication Date:
2024-01-19
Description:
In this study, we discuss the extra-value of polarimetric information in observing the lava flow. Dualpolarimetric
Synthetic Aperture Radar (SAR) measurements are processed using a polarimetric change detector
that, instead of looking at the variation of the backscatter intensity between a pair of images collected before
and after the event, looks at changes in the polarimetric scattering behavior. We demonstrate that the scattering
changes detected by the proposed polarimetric approach well-correlate with the footprint of the lava flow
provided by external sources. In addition, we also compare the performance of the polarimetric change detector
with conventional single-polarization metrics showing that the former one always outperforms the incoherent
single-polarization measurements. To further demonstrate the robustness of the polarimetric change detectors,
we selected two test cases that refer to vulcanic eruptions calling for completely different environments. The
first one, related to the Etna volcano, calls for a lava flow over a vegetation-free environment; the second one
is related to the Nyiragongo volcano and calls for a lava flow in a vegetated environment. Experimental results
show that the polarimetric change detectors automatically adapt to the changing environment outperforming
the single-polarization detectors.
Description:
Published
Description:
103471
Description:
OSV3: Sviluppo di nuovi sistemi osservazionali e di analisi ad alta sensibilità
Description:
JCR Journal
Keywords:
Lava flow
;
Change detection
;
Polarimetric SAR
;
Sentinel-1
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
