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TitreSAR interferometry for permafrost monitoring
TéléchargerTéléchargement (publication entière)
LicenceVeuillez noter que la Licence du gouvernement ouvert - Canada remplace toutes les licences antérieures.
AuteurShort, N; Brisco, B; Budkewitsch, P; Murnaghan, K
SourcePermafrost science at ESS: a workshop on GSC/CCRS scientific opportunities; par Wolfe, S A (éd.); Commission géologique du Canada, Dossier public 6531, 2010 p. 24-25; 1 CD-ROM, (Accès ouvert)
ÉditeurRessources naturelles Canada
RéunionWorkshop on GSC/CCRS Scientific Opportunities; Ottawa, ON; CA; Novembre 26, 2009
Documentdossier public
MediaCD-ROM; en ligne; numérique
Référence reliéeCette publication est contenue dans Wolfe, S A; (2010). Permafrost science at ESS: a workshop on GSC/CCRS scientific opportunities, Commission géologique du Canada, Dossier public 6531
ProvinceTerritoires du Nord-Ouest
Lat/Long OENS-140.0000 -139.0000 69.7500 69.5000
Sujetspergélisol; congélation du sol; glace fossile; températures au sol; sensitivité de terrain; types de terrain; analyse de terrains; géologie de l'arctique; établissement de modèles; techniques de cartographie; télédétection; imagerie par satellite; géologie des dépôts meubles/géomorphologie; géophysique
Diffusé2010 01 01
Résumé(disponible en anglais seulement)
Synthetic Aperture Radar interferometry (InSAR) is a technique that can be used to measure ground movement from two or more SAR acquisitions. The SAR data sets must be of the same area, acquired with exactly the same radar properties and the same viewing geometry, and separated by a period of time. When the SAR data are processed carefully and controlled for errors, the resulting patterns of phase shift can be converted to patterns of ground movement.
While the theory of InSAR for permafrost environments is well established, SAR satellite limitations have made it difficult, if not impossible, to carry out regular monitoring. In the past four years three new SAR satellites have been launched with dramatically improved capabilities for InSAR. These sensors are ALOS-PALSAR (Lband SAR), RADARSAT-2 (C-band SAR) and TerraSAR-X (X-band SAR).The project
at CCRS is a comprehensive exploration of these new sensors and their capabilities for use in permafrost environments.
Preliminary results show that the quality of the InSAR data pairs from the new sensors is very high and that ground movement patterns can be clearly identified. Figure 1 shows the ground displacement detected over Herschel Island between August 19 and October 4, 2007, using ALOS-PALSAR data. Significant subsidence is observed on the north coast and over the higher elevation areas. Figure 2. shows the ground displacement detected over a one year period for the same area, also using ALOS-PALSAR data. Again significant subsidence is noted along the north coast. Other subsidence patterns seem more related to surface hydrology and breaks in surface slope.The SAR sensors recently launched appear to hold significant promise for detecting ground displacement patterns over larger areas than are possible with ground surveys. Both seasonal and longer term trends can be detected. Future work includes plans for field validation and investigation of the high resolution modes of RADARSAT-2 and TerraSAR-X.