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Sensors 2018, 18(4), 1230; doi:10.3390/s18041230

Finding the Key Periods for Assimilating HJ-1A/B CCD Data and the WOFOST Model to Evaluate Heavy Metal Stress in Rice

1
School of Information Engineering, China University of Geosciences, Haidian District, Beijing 100083, China
2
96669 Troops, Changping District, Beijing 102208, China
3
State Grid Energy Research Institute, Changping District, Beijing 102209, China
*
Author to whom correspondence should be addressed.
Received: 7 March 2018 / Revised: 5 April 2018 / Accepted: 16 April 2018 / Published: 17 April 2018
(This article belongs to the Section Remote Sensors)
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Abstract

Accurately monitoring heavy metal stress in crops is vital for food security and agricultural production. The assimilation of remote sensing images into the World Food Studies (WOFOST) model provides an efficient way to solve this problem. In this study, we aimed at investigating the key periods of the assimilation framework for continuous monitoring of heavy metal stress in rice. The Harris algorithm was used for the leaf area index (LAI) curves to select the key period for an optimized assimilation. To obtain accurate LAI values, the measured dry weight of rice roots (WRT), which have been proven to be the most stress-sensitive indicator of heavy metal stress, were incorporated into the improved WOFOST model. Finally, the key periods, which contain four dominant time points, were used to select remote sensing images for the RS-WOFOST model for continuous monitoring of heavy metal stress. Compared with the key period which contains all the available remote sensing images, the results showed that the optimal key period can significantly improve the time efficiency of the assimilation framework by shortening the model operation time by more than 50%, while maintaining its accuracy. This result is highly significant when monitoring heavy metals in rice on a large-scale. Furthermore, it can also offer a reference for the timing of field measurements in monitoring heavy metal stress in rice. View Full-Text
Keywords: remote sensing; key period; heavy metal stress; WOFOST model; Harris algorithm; data assimilation remote sensing; key period; heavy metal stress; WOFOST model; Harris algorithm; data assimilation
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Zhao, S.; Qian, X.; Liu, X.; Xu, Z. Finding the Key Periods for Assimilating HJ-1A/B CCD Data and the WOFOST Model to Evaluate Heavy Metal Stress in Rice. Sensors 2018, 18, 1230.

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