| Title | SAR interferometry for permafrost monitoring |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Short, N ; Brisco,
B; Budkewitsch, P; Murnaghan, K |
| Source | Permafrost science at ESS: a workshop on GSC/CCRS scientific opportunities; by Wolfe, S A (ed.); Geological Survey of Canada, Open File 6531, 2010 p. 24-25; 1 CD-ROM, https://doi.org/10.4095/263380  Open Access |
| Year | 2010 |
| Publisher | Natural Resources Canada |
| Meeting | Workshop on GSC/CCRS Scientific Opportunities; Ottawa, ON; CA; November 26, 2009 |
| Document | open file |
| Lang. | English |
| Media | CD-ROM; on-line; digital |
| Related | This publication is contained in Permafrost science at ESS:
a workshop on GSC/CCRS scientific opportunities |
| File format | pdf |
| Province | Northwest Territories |
| NTS | 117D/12 |
| Area | Herschel Island |
| Lat/Long WENS | -140.0000 -139.0000 69.7500 69.5000 |
| Subjects | surficial geology/geomorphology; geophysics; permafrost; freezing ground; ground ice; ground temperatures; terrain sensitivity; terrain types; terrain analysis; arctic geology; modelling; mapping
techniques; remote sensing; satellite imagery |
| Released | 2010 01 01 |
| Abstract | 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. |
| GEOSCAN ID | 263380 |
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