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Paddy Rice mapping in fragmented lands by improved phenology curve and correlation measurements on Sentinel-2 imagery in Google earth engine

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Abstract

Accurate and timely rice crop mapping is important to address the challenges of food security, water management, disease transmission, and land use change. However, accurate rice crop mapping is difficult due to the presence of mixed pixels in small and fragmented rice fields as well as cloud cover. In this paper, a phenology-based method using Sentinel-2 time series images is presented to solve these problems. First, the improved rice phenology curve is extracted based on Normalized Difference Vegetation Index and Land Surface Water Index time series data of rice fields. Then, correlation was taken between rice phenology curve and time series data of each pixel. The correlation result of each pixel shows the similarity of its time series behavior with the proposed rice phenology curve. In the next step, the maximum correlation value and its occurrence time are used as the feature vectors of each pixel to classification. Since correlation measurement provides data with better separability than its input data, training the classifier can be done with fewer samples and the classification is more accurate. The implementation of the proposed correlation-based algorithm can be done in a parallel computing. All the processes were performed on the Google Earth Engine cloud platform on the time series images of the Sentinel 2. The implementations show the high accuracy of this method.

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The custom code for data analysis is available upon request from the corresponding author.

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Authors and Affiliations

  1. Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Babol, Iran

    Fateme Namazi & Mehdi Ezoji

  2. Department of Geomatics, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran

    Ebadat Ghanbari Parmehr

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  1. Fateme Namazi
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  2. Mehdi Ezoji
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Contributions

Fateme Namazi- Conceptualization, Methodology, Software, Formal analysis, Validation, Visualization, Writing - original draft. Mehdi Ezoji- Supervision, Conceptualization, Methodology, Investigation, Validation, Writing - review & editing. Ebadat Ghanbari Parmehr- Supervision, Conceptualization, Investigation, Validation, Writing - review & editing.

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Correspondence to Mehdi Ezoji.

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Namazi, F., Ezoji, M. & Parmehr, E.G. Paddy Rice mapping in fragmented lands by improved phenology curve and correlation measurements on Sentinel-2 imagery in Google earth engine. Environ Monit Assess 195, 1220 (2023). https://doi.org/10.1007/s10661-023-11808-3

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