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Remote Sens. 2014, 6(10), 9194-9212; doi:10.3390/rs6109194

Sequential Method with Incremental Analysis Update to Retrieve Leaf Area Index from Time Series MODIS Reflectance Data

State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China
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Received: 25 April 2014 / Revised: 15 September 2014 / Accepted: 15 September 2014 / Published: 26 September 2014
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Abstract

High-quality leaf area index (LAI) products retrieved from satellite observations are urgently needed for crop growth monitoring and yield estimation, land-surface process simulation and global change studies. In recent years, sequential assimilation methods have been increasingly used to retrieve LAI from time series remote-sensing data. However, the inherent characteristics of these sequential assimilation methods result in temporal discontinuities in the retrieved LAI profiles. In this study, a sequential assimilation method with incremental analysis update (IAU) was developed to jointly update model states and parameters and to retrieve temporally continuous LAI profiles from time series Moderate Resolution Imaging Spectroradiometer (MODIS) reflectance data. Based on the existing multi-year Global Land Surface Satellite (GLASS) LAI product, a dynamic model was constructed to evolve LAI anomalies over time. The sequential assimilation method with an IAU technique takes advantage of the Kalman filter (KF) technique to update model parameters, uses the ensemble Kalman filter (EnKF) technique to update LAI anomalies recursively from time series MODIS reflectance data and then calculates the temporally continuous LAI values by combining the LAI climatology data. The method was tested over eight Committee on Earth Observing Satellites-Benchmark Land Multisite Analysis and Intercomparison of Products (CEOS-BELMANIP) sites with different vegetation types. The results indicate that the sequential method with IAU can precisely reconstruct the seasonal variation patterns of LAI and that the LAI profiles derived from the sequential method with IAU are smooth and continuous. View Full-Text
Keywords: leaf area index; sequential assimilation; moderate resolution imaging spectroradiometer (MODIS); ensemble Kalman filter (EnKF); incremental analysis update (IAU) leaf area index; sequential assimilation; moderate resolution imaging spectroradiometer (MODIS); ensemble Kalman filter (EnKF); incremental analysis update (IAU)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jiang, J.; Xiao, Z.; Wang, J.; Song, J. Sequential Method with Incremental Analysis Update to Retrieve Leaf Area Index from Time Series MODIS Reflectance Data. Remote Sens. 2014, 6, 9194-9212.

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