Estimation of rice biophysical parameters using multitemporal RADARSAT-2 images

9th Symposium of the International Society for Digital Earth

地球科学;计算机科学

Li, S.^1 ; Ni, P.^1 ; Cui, G.^1 ; He, P.^1 ; Liu, H.^1 ; Li, L.^1 ; Liang, Z.^1

School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu

611731, China^1

关键词: Backscattering coefficients;    Biophysical parameters;    Canopy water contents;    Estimation models;    Experimental plots;    Fraction of photosynthetically active radiations;    Potential capability;    RADARSAT-2 images;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/34/1/012019/pdf
DOI  :  10.1088/1755-1315/34/1/012019

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Compared with optical sensors, synthetic aperture radar (SAR) has the capability of acquiring images in all-weather conditions. Thus, SAR images are suitable for using in rice growth regions that are characterized by frequent cloud cover and rain. The objective of this paper was to evaluate the probability of rice biophysical parameters estimation using multitemporal RADARSAT-2 images, and to develop the estimation models. Three RADARSTA-2 images were acquired during the rice critical growth stages in 2014 near Meishan, Sichuan province, Southwest China. Leaf area index (LAI), the fraction of photosynthetically active radiation (FPAR), height, biomass and canopy water content (WC) were observed at 30 experimental plots over 5 periods. The relationship between RADARSAT-2 backscattering coefficients (σ0) or their ratios and rice biophysical parameters were analysed. These biophysical parameters were significantly and consistently correlated with the VV and VH σ0ratio (σ0VV/ σ0VH) throughout all growth stages. The regression model were developed between biophysical parameters and σ0VV/ σ0VH. The results suggest that the RADARSAT-2 data has great potential capability for the rice biophysical parameters estimation and the timely rice growth monitoring.