L-band InSAR decorrelation analysis in volcanic terrains using airborne LiDAR data and in situ measurements: The case of the Piton de la Fournaise volcano, France - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

L-band InSAR decorrelation analysis in volcanic terrains using airborne LiDAR data and in situ measurements: The case of the Piton de la Fournaise volcano, France

Résumé

We combine ALOS-PALSAR coherence images with airborne LiDAR data, both acquired over the Piton de la Fournaise volcano (Reunion Island, France), to study the main errors affecting repeat-pass InSAR measurements and understand their causes. The high resolution DTM generated using LiDAR data is used to subtract out the topographic contribution from the interferogram and to improve the radar coherence maps. The relationship between LiDAR intensity and radar coherence is then analyzed over several typical volcanic surfaces: it helps to evaluate the coherence loss terms. Additionally, the geometric and physical properties of these surfaces have been measured in situ. Coherence deteriorates over pyroclastic deposits and rough lava flows due to volume and surface scattering. In the presence of vegetation, it is directly related to plant density: the higher the Leaf Area Index (LAI), the lower the coherence. The accuracy of InSAR measurements strongly decreases for LAI higher than 7.
Fichier non déposé

Dates et versions

hal-03946049 , version 1 (18-01-2023)

Identifiants

Citer

Mélanie Sedze, Essam Heggy, Frédéric Bretar, Daniel Berveiller, Stéphane Jacquemoud. L-band InSAR decorrelation analysis in volcanic terrains using airborne LiDAR data and in situ measurements: The case of the Piton de la Fournaise volcano, France. IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium, Jul 2012, Munich, Germany. pp.3907-3910, ⟨10.1109/IGARSS.2012.6350558⟩. ⟨hal-03946049⟩
16 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More