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DINSAR SEASONAL SURFACE DISPLACEMENT IN BUILT AND NATURAL PERMAFROST ENVIRONMENTS, IQALUIT, NUNAVUT, CANADA
Session: GIS and Remote Sensing in Cold Regions / SIG et télédétection en régions nordiques
Anne-Marie LeBlanc, Geological Survey of Canada, Natural Resources Canada (Canada)
Naomi Short, Canada Centre for Mapping and Earth Observation, Natural Resources Canada (Canada)
Valérie Mathon-Dufour, Centre d’études nordiques, Université Laval (Canada)
Michel Allard, Centre d’études nordiques, Université Laval (Canada)
Tommy Tremblay, Canada-Nunavut Geoscience Office (Canada)
Greg A. Oldenborger, Geological Survey of Canada, Natural Resources Canada (Canada)
Jason Chartrand, Geological Survey of Canada, Natural Resources Canada (Canada)
Three consecutive years of seasonal surface displacement in Iqaluit, Nunavut, were derived using Differential Interferometric Synthetic Aperture Radar (DInSAR). Results show that low displacement is associated with bedrock and coarse sediments. Finer sediments, more likely to be ice-rich, show higher values of displacement. In addition to ground ice, other factors such as water at the surface and within the active layer, but also the mapping scale of surficial deposits can explain some displacement patterns. For a given surficial geology unit, displacements were generally lower in built areas than in the natural environment. One DInSAR season could be used to identify difficult terrain for construction. However, more than one season helps to differentiate between different causes of displacement. Findings are useful to guide DInSAR applications especially for infrastructure management and planning.
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