A scheme for regional rice yield estimation using ENVISAT ASAR data

文献类型： 外文期刊

第一作者： Shen ShuangHe

作者： Shen ShuangHe;Yang ShenBin;Li BingBai;Tan BingXiang;Le Toan Thuy

作者机构：

关键词： rice yield map;crop model;data assimilation;optimization algorithm;classification;ASAR

期刊名称：SCIENCE IN CHINA SERIES D-EARTH SCIENCES （ 影响因子：1.588； 五年影响因子：1.42 ）

ISSN： 1006-9313

年卷期： 2009 年 52 卷 8 期

页码：

收录情况： SCI

摘要： Information on rice growing areas and rice production is critical for most rice growing countries to make state and economic policies. However, the areas where rice crop is cultivated are often cloudy and rainy, which entails the use of radar remote sensing data for rice monitoring. In this paper, a practical scheme to integrate multi-temporal and multi-polarization ENVISAT ASAR data into rice crop model for regional rice yield estimation has been presented. To achieve this, rice distribution information should be obtained first by rice mapping method to retrieve rice fields from ASAR images, and then an assimilation method is applied to use the observed multi-temporal rice backscattering coefficients which are grouped for each rice pixel to re-initialize ORYZA2000 to predict rice yield. The assimilation method re-initializes the model with optimal input parameters, allowing a better temporal agreement between the rice backscattering coefficients retrieved from ASAR data and the rice backscattering coefficients simulated by a coupled model, i.e., the combination of ORYZA2000 and a semi-empirical rice backscatter model through LAI. The SCE-UA optimization algorithm is employed to determine the optimal set of input parameters. After the re-initialization, rice yield for each rice pixel is calculated, and the yield map over the area of interest is produced. The scheme was validated over Xinghua study area located in the middle of Jiangsu Province of China by using the data set of an experimental campaign carried out during the 2006 rice season. The result shows that the obtained rice yield map generally overestimates the actual rice production by 13% on average and with a root mean square error of approximately 1133 kg/ha on validation sites, but the tendency of rice growth status and spatial variation of the rice yield are well predicted and highly consistent with the actual production variation.

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