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The relationship between the leaf area index (LAI) of rice and the C-band SAR vertical/horizontal (VV/HH) polarization ratio

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We investigated the relationship between the leaf area index (LAI) of rice and the ENVISAT Advanced Synthetic Aperture Radar (ASAR) vertical/horizontal (VV/HH) polarization ratio. Four alternating polarization ASAR images of swaths IS4 and IS5 over rice fields were used in the study. The VV/HH polarization ratio correlates well with the field-measured LAI and an empirical relationship was established to estimate the LAI of rice using the VV/HH polarization ratio. A theoretical radiative transfer model was adopted to analyse the relationship. The error of the estimated LAI was 0.17 for the test site and a better correlation was found when LAI was less than 3.5. The results suggest that ASAR alternating polarization data can be used to estimate the LAI of rice for wide-area monitoring of rice growth.

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/01431160802609700

Affiliations: 1: Institute of Space and Earth Information Science, The Chinese University of Hong Kong (CUHK), Hong Kong, China 2: College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, China

Publication date: April 1, 2009

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