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Article

Sensitivity of C-Band SAR Polarimetric Variables to the Directionality of Surface Roughness Parameters

Department of Geography, Environment and Geomatics, University of Guelph, Guelph, ON N1G 2W1, Canada
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Author to whom correspondence should be addressed.
Academic Editors: Paavo Nevalainen, Fahimeh Farahnakian, Maarit Middlet, Jonne Pohjankukka and Sang-Eun Park
Remote Sens. 2021, 13(11), 2210; https://doi.org/10.3390/rs13112210
Received: 30 January 2021 / Revised: 24 May 2021 / Accepted: 31 May 2021 / Published: 5 June 2021
Surface roughness is an important factor in many soil moisture retrieval models. Therefore, any mischaracterization of surface roughness parameters (root mean square height, RMSH, and correlation length, ʅ) may result in unreliable predictions and soil moisture estimations. In many environments, but particularly in agricultural settings, surface roughness parameters may show different behaviours with respect to the orientation or azimuth. Consequently, the relationship between SAR polarimetric variables and surface roughness parameters may vary depending on measurement orientation. Generally, roughness obtained for many SAR-based studies is estimated using pin profilers that may, or may not, be collected with careful attention to orientation to the satellite look angle. In this study, we characterized surface roughness parameters in multi-azimuth mode using a terrestrial laser scanner (TLS). We characterized the surface roughness parameters in different orientations and then examined the sensitivity between polarimetric variables and surface roughness parameters; further, we compared these results to roughness profiles obtained using traditional pin profilers. The results showed that the polarimetric variables were more sensitive to the surface roughness parameters at higher incidence angles (θ). Moreover, when surface roughness measurements were conducted at the look angle of RADARSAT-2, more significant correlations were observed between polarimetric variables and surface roughness parameters. Our results also indicated that TLS can represent more reliable results than pin profiler in the measurement of the surface roughness parameters. View Full-Text
Keywords: surface roughness; orientation; sensitivity analysis; radar parameters surface roughness; orientation; sensitivity analysis; radar parameters
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MDPI and ACS Style

Alijani, Z.; Lindsay, J.; Chabot, M.; Rowlandson, T.; Berg, A. Sensitivity of C-Band SAR Polarimetric Variables to the Directionality of Surface Roughness Parameters. Remote Sens. 2021, 13, 2210. https://doi.org/10.3390/rs13112210

AMA Style

Alijani Z, Lindsay J, Chabot M, Rowlandson T, Berg A. Sensitivity of C-Band SAR Polarimetric Variables to the Directionality of Surface Roughness Parameters. Remote Sensing. 2021; 13(11):2210. https://doi.org/10.3390/rs13112210

Chicago/Turabian Style

Alijani, Zohreh, John Lindsay, Melanie Chabot, Tracy Rowlandson, and Aaron Berg. 2021. "Sensitivity of C-Band SAR Polarimetric Variables to the Directionality of Surface Roughness Parameters" Remote Sensing 13, no. 11: 2210. https://doi.org/10.3390/rs13112210

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