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Rice Crop Monitoring in South China With RADARSAT-2 Quad-Polarization SAR Data

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5 Author(s)
Fan Wu ; Center for Earth Obs. & Digital Earth, Chinese Acad. of Sci., Beijing, China ; Chao Wang ; Hong Zhang ; Bo Zhang
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This letter presents preliminary results of an attempt to monitor rice crop growth using RADARSAT-2 quad polarization synthetic aperture radar (SAR) data. Three RADARSAT-2 quad-polarization SAR images are collected from transplanting to rice crop harvesting. Ground truth data, such as rice height and biomass, are measured during RADARSAT-2 data acquisition in Hainan Province, South China. The correlation between backscattering coefficient and rice growth parameters is analyzed, and then, a rice field mapping method with quad polarization SAR image is developed. Experiments show that an HV or VH image backscattering coefficient exhibits the best correlation with rice age after transplantation. Furthermore, the HV or VH image is also more suitable for retrieving rice growth parameters, such as rice height and dry biomass, for FQ4 RADARSAT-2 SAR data. The ratio image of HH/VV possesses high separability required to distinguish rice crop from banana, forest, and river. Results indicate that RADARSAT-2 quad polarization SAR data presented enormous potential for monitoring rice crop growth.

Published in:

Geoscience and Remote Sensing Letters, IEEE  (Volume:8 ,  Issue: 2 )

Date of Publication:

March 2011

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