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TitleSub-Arctic peatland characterization using polarimetric L-band ALOS and C-band Radarsat2
AuthorTouzi, R; Gosselin, G; Millard, K; Li, J
Source33rd Canadian Symposium on Remote Sensing, abstracts; by Canadian Symposium on Remote Sensing; 2012 p. 44 Open Access logo Open Access
LinksOnline - En ligne (whole volume - volume complet, 7z, 4.48 MB)
Alt SeriesEarth Sciences Sector, Contribution Series 20140083
Meeting33rd Canadian Symposium on Remote Sensing; Ottawa; CA; June 11-14, 2012
Mediaon-line; digital
File formatpdf; doc (Microsoft® Word®)
NTS54G; 54K
AreaWapusk National Park
Lat/Long WENS -94.0000 -92.5000 59.0000 57.0000
Subjectsgeophysics; remote sensing; satellite imagery; analytical methods; peat classifications; peat; peatlands
AbstractFully polarimetric L-band ALOS and C-band Radarsat2 acquisitions are analyzed for the characterization of subarctic peatlands in the Wapusk National Park. The Touzi decomposition, which characterizes target scattering with a complex entity (magnitude and phase), is used for the optimum extraction of the wetland polarization information. Both magnitude and phase of the scattering type have previously been shown very promising for wetland class characterization. In particular, the scattering type phase was shown to be sensitive to peatland subsurface water, and as such, very promising for separation of nutrient poor fens from bogs. The results obtained with L-band ALOS data collected between June and September 2010 confirm the excellent performance of the Touzi scattering phase for detection and monitoring of underneath peat water flow. While the multi-polarization information could not detect any hydraulic changes in a sedge bulrush fen, the Touzi scattering phase is sensitive to the peatland subsurface water level variations between the June starting permafrost melting season (13 cm active layer) and the more advanced July melting seasons (27 cm active layer). Unfortunately, these results could not be confirmed with the C-band Radarsat2 data. Even though Radarsat2 is of low noise floor (better than -34 dB), the HV short wavelength signal to noise ratio remains too low for efficient detection of subsurface peatland water flow. However, the C-band Radarsat2 is more suitable for vegetation species characterization than ALOS. The third eigenvalue of the coherency matrix provides information that is strongly correlated with the NDVI generated from Landsat data.

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