ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2024, Vol. 21, No. 5, pp. 116-129

Performance assessment of multi-season machine learning models for large-scale in-season winter crops mapping

D.E. Plotnikov 1 , Yu.Sh. Boimatov 2 , E.S. Elkina 1 , E.V. Shcherbenko 3 , A.S. Plotnikova 4 
1 Space Research Institute RAS, Moscow, Russia
2 Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia
3 OOO Space Research Institute for the Earth, Moscow, Russia
4 Center for Forest Ecology and Productivity RAS, Moscow, Russia
Accepted: 30.09.2024
DOI: 10.21046/2070-7401-2024-21-5-116-129
In this study, we have evaluated the potential of ensemble machine learning methods Random Forest and XGBoost for winter crops mapping over large areas when training on multi-season datasets for five consecutive years. Two experiments were conducted: accuracy intercomparison of multi-season models of two architectures and intercomparison of multi-season and a series of single-season models of optimal architecture. The results of the experiments were provided for the study region covering more than 94 % of winter crops areas sown in Russia, based on comparison with the Rosstat (Federal State Statistics Service) data and the results of the automatic benchmark method using RMSE (root mean squared error) and coefficient of determination R 2, as well as the F-score metric for the winter crop class. In the first experiment, the potential of multi-season models was demonstrated, and the Random Forest multi-season model proved to be more efficient and more stable than XGBoost, the RMSE improvement compared to the reference maps averaged 28 th. ha and was observed for all of the five seasons; the relative improvement was 15 % on average, reaching 35 %. The results of the second experiment which compared the five single-season models and the multi-season model also indicated the effectiveness of the multi-season model: the cumulative RMSE of the multi-season model for 5 seasons is 1.32–2.02 times less than of single-season models, and the average F-score for any multi-season model falls in the range of 0.75–0.79, while for the multi-season model, it is as high as 0.84.
Keywords: multi-season model, Random Forest, XGBoost, satellite mapping, winter crops, LOWESS, time series, grid search, machine learning
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