DocumentCode :
508469
Title :
Preliminary evaluation of Radarsat-2 polarimetric SAR data for forest applications
Author :
Goodenough, D.G. ; Hao Chen ; Hobart, G. ; Richardson, A. ; Wen Hong ; Fang Cao ; Erxue Chen
Author_Institution :
Pacific Forestry Centre, Natural Resources Canada, Victoria, BC
fYear :
2009
fDate :
20-22 April 2009
Firstpage :
1
Lastpage :
5
Abstract :
Radarsat-2 polarimetric SAR data for Natural Resources Canada became available in May, 2008. In this paper we evaluate analysis methods and investigate potential forest applications with Radarsat-2 polarimetric SAR data. The Radarsat-2 Fine Quad-polarization data were studied and the Cloude H/A/Alpha and Freeman three-component decompositions were performed. We found that Radarsat-2 FQ data has a Faraday rotation angle estimated at less than 0.01 degree. The georeferencing information embedded in the FQ metadata file provided good pixel positioning accuracy. However, polarization orientation shifts introduced by terrain topography slopes in azimuth direction were difficult to be sensed. Various polarimetric parameterizations of Radarsat-2 FQ data are useful for identifying different landcover types and detecting changes in forested areas. The Cloude entropy, dominant scattering alpha and eigenvalues (lambda2+lambda3) were used to create a HSV coding image for better differentiation of water surface, vegetation and forest and to reduce topographic effects. Multitemporal time series of the Freeman decompositions showed that the volume and double bounce scattering were as expected. The surface scattering was seen to be stronger in winter than in summer.
Keywords :
radar imaging; radar polarimetry; remote sensing by radar; spaceborne radar; synthetic aperture radar; vegetation mapping; Cloude entropy; Faraday rotation angle; Freeman decompositions; Radarsat-2 fine quad-polarization data; dominant scattering alpha; double bounce scattering; georeferencing information; pixel positioning accuracy; polarimetric synthetic aperture radar; surface scattering; terrain topography; Radarsat-2; decomposition; forest; polarimetric;
fLanguage :
English
Publisher :
iet
Conference_Titel :
Radar Conference, 2009 IET International
Conference_Location :
Guilin
ISSN :
0537-9989
Print_ISBN :
978-1-84919-010-7
Type :
conf
Filename :
5367331
Link To Document :
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