TY - GEN
T1 - L-band InSAR decorrelation analysis in volcanic terrains using airborne LiDAR data and in situ measurements
T2 - 32nd IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2012
AU - Sedze, Melanie
AU - Heggy, Essam
AU - Bretar, Frederic
AU - Berveiller, Daniel
AU - Jacquemoud, Stephane
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - LiDAR
KW - Piton de la Fournaise volcano
KW - Radar coherence
UR - https://www.scopus.com/pages/publications/84873103625
U2 - 10.1109/IGARSS.2012.6350558
DO - 10.1109/IGARSS.2012.6350558
M3 - Conference contribution
AN - SCOPUS:84873103625
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 3907
EP - 3910
BT - IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 22 July 2012 through 27 July 2012
ER -