Monitoring hanging glacier dynamics from sar images using corner reflectors and field measurements in the Mont-Blanc Massif - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences Année : 2022

Monitoring hanging glacier dynamics from sar images using corner reflectors and field measurements in the Mont-Blanc Massif

Résumé

This paper focuses on the monitoring of a small hanging glacier with Synthetic Aperture Radar (SAR) images using a combination of artificial Corner Reflectors (CRs) and dGNSS field measurements. First, to test the performance of the CRs in high-resolution X-band and medium-resolution C-band images acquired by PAZ and Sentinel-1 satellites respectively, a series of tests was performed with two CRs installed in the Chamonix valley. After the confirmation of good visibility in the valley datasets from both satellites, four CRs were installed in summer 2021 on a steep (≈ 52° average slope) hanging glacier on the North face of Aiguille du Midi (3842 ma.s.l., Mont-Blanc massif). After the successful installation on the hanging glacier, all CRs were visible in both sets of images (PAZ and Sentinel-1). Using the CRs as a reference, glacier displacements were estimated in SAR images using complex cross-correlation, and validated by using ground measurements (dGNSS) and theoretical relationships between ice thickness and surface velocity. We observed average summer velocities of ≈ 0.05 m/day at the front of the glacier from field measurements and ≈ 0.04 m/day from SAR displacement estimates. The study shows the potential and limitations of using CRs as a tool for monitoring glaciers in complex topographies.
Fichier principal
Vignette du fichier
ISPRS_2022_full_paper.pdf (13.71 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Licence : CC BY - Paternité

Dates et versions

hal-03702869 , version 1 (30-03-2023)

Licence

Paternité

Identifiants

Citer

Suvrat Kaushik, Silvan Leinss, Ludovic Ravanel, Emmanuel Trouvé, Yajing Yan, et al.. Monitoring hanging glacier dynamics from sar images using corner reflectors and field measurements in the Mont-Blanc Massif. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2022, V-3-2022, pp.325-332. ⟨10.5194/isprs-annals-V-3-2022-325-2022⟩. ⟨hal-03702869⟩
61 Consultations
10 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More