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A Methodology for Estimating Leaf Area Index by Assimilating Remote Sensing Data into Crop Model Based on temporal and spatial knowledge

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Chinese Geographical Science 2013年第5期23卷 550-561页

作者： ZHU Xiaohua ZHAO Yingshi FENG Xiaoming Key Laboratory of Quantitative Remote Sensing Information Technology Academy of Opto-ElectronicsChinese Academy of Sciences Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences University of Chinese Academy of Sciences Research Center of Eco-environmental Science Chinese Academy of Sciences

In this paper,a methodology for Leaf Area Index(LAI) estimating was proposed by assimilating remote sensed data into crop model based on temporal and spatial ***,sensitive parameters of crop model were calibrated by Shuffled Complex Evolution method developed at the University of Arizona(SCE-UA) optimization method based on phenological information,which is called temporal *** calibrated crop model will be used as the forecast ***,the Taylor′s mean value theorem was applied to extracting spatial information from the Moderate Resolution Imaging Spectroradiometer(MODIS) multi-scale data,which was used to calibrate the LAI inversion results by A two-layer Canopy Reflectance Model(ACRM) *** calibrated LAI result was used as the observation ***,an Ensemble Kalman Filter(EnKF) was used to assimilate MODIS data into crop *** results showed that the method could significantly improve the estimation accuracy of LAI and the simulated curves of LAI more conform to the crop growth situation closely comparing with MODIS LAI *** root mean square error(RMSE) of LAI calculated by assimilation is 0.9185 which is reduced by 58.7% compared with that by simulation(0.3795),and before and after assimilation the mean error is reduced by 92.6% which is from 0.3563 to *** these experiments indicated that the methodology proposed in this paper is reasonable and accurate for estimating crop LAI.

关键词： assimilation temporal and spatial knowledge Leaf Area Index (LAI) crop model Ensemble Kalman Filter (EnKF)

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