Mermoz, Stéphane; Allain, Sophie; Bernier, Monique; Pottier, Eric; Van Der Sanden, Joost J.; Chokmani, Karem
(2012).
Retrieval of river ice thickness from C-band PolSAR data.
In: IEEE International Geoscience and Remote Sensing Symposium - IGARSS 2012, 22-27 juillet 2012, Munich, Allemagne.
Résumé
River ice has an important effect on natural processes
and human activities in northern countries. Current models for
estimating river ice thickness are mostly based on environmental
data. They require several inputs and yield only a global estimate
of ice thickness for a large heterogeneous area. Attempts have
been made intending to retrieve river ice thickness from remote
sensing using monopolarized C-band radar data. No reliable maps
of ice thickness have been produced. In this paper, the potential of
polarimetric synthetic aperture radar (PolSAR) data for estimating
river ice thickness is demonstrated, and a river ice thickness
retrieval model is proposed. The C-band SAR images used in
this paper were acquired by Radarsat-2 in the winter of 2009
over the Saint-François River (Southern Quebec), the Koksoak
River (Northern Quebec), and the Mackenzie River (Northwest
Territories) in Canada. Field campaigns were carried out to obtain
ice thickness validation data at 70 locations. Polarimetric entropy
was used to obtain ice thickness estimates. This approach results
in spatially distributed ice thickness maps for selected ice types.
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