Determination of glacier velocities at a large spatial scale from optical satellite archives

• Published in: 2014 IEEE Geoscience and Remote Sensing Symposium
• Main Authors: Dehecq, Amaury, Trouvé, Emmanuel, Gourmelen, Noel
• Other Authors: Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ), School of Geosciences Edinburgh, University of Edinburgh (Edin.)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2014
• Subjects: [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]; glacier*
• Online Access: https://hal.science/hal-01154179; https://doi.org/10.1109/IGARSS.2014.6947366

International audience In this paper we present a processing strategy to derive glaciers' velocity fields from a complete satellite archive. All possible pairs with a specified time span are formed, submitted to the same preprocessing and matched together to derive velocity fields. All the results are then selected on a pixel-by-pixel basis based on the confidence of the offset-tracking and merged together by computing the median in a spatio-temporal neighboorhood. The method is applied to 206 images covering the Karakoram region and a period of 3 years. This allows us to estimate a velocity for over 90% of the glaciers' area and to reduce the residuals from 9.9m/yr to 2.1m/yr.