Estimation of sunflower planted areas in Ukraine during full-scale Russian invasion: Insights from Sentinel-1 SAR data

被引:3
作者
Qadir, Abdul [1 ]
Skakun, Sergii [1 ,2 ]
Becker-Reshef, Inbal [1 ]
Kussul, Nataliia [1 ,3 ,4 ]
Shelestov, Andrii [3 ,4 ]
机构
[1] Univ Maryland, Dept Geog Sci, 2181 LeFrak Hall, College Pk, MD 20740 USA
[2] Univ Maryland, Coll Informat Studies iSchool, College Pk, MD 20740 USA
[3] NAS Ukraine & SSA Ukraine, Space Res Inst, UA-03680 Kiev, Ukraine
[4] Natl Tech Univ Ukraine, Igor Sikorsky Kyiv Polytech Inst, UA-03056 Kiev, Ukraine
来源
SCIENCE OF REMOTE SENSING | 2024年 / 10卷
关键词
Sunflower; Synthetic aperture radar (SAR); Generalized classifier; Area estimation; Conflict; Food security; Ukraine; Russia; SPATIAL ASSOCIATION; RANDOM FORESTS; AGRICULTURE; EFFICIENCY; ACCURACY; COVER;
D O I
10.1016/j.srs.2024.100139
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Data limitations and attributability issues due to the full-scale Russian invasion of Ukraine in February 2022 presents continuing challenges in assessing production of major commodity crops in Ukraine. Up-to-date satellite imagery provides evidence of rapid changes in cropland within temporary occupied territories (TOT) by Russia within Ukraine. Ukraine is the world's top producer and exporter of sunflower and, therefore, monitoring, and quantifying changes in areas and production of sunflower is extremely important. We used Sentinel-1 (S1) synthetic aperture radar (SAR) images to quantify changes in sunflower planted areas in Ukraine during 2021-2022. We developed an operational workflow and produced the first available 20-m resolution sunflower maps over Ukraine. We developed a SAR-based generalized approach for sunflower mapping using a previously developed phenological metric and estimated sunflower planted areas and corresponding changes in 2021 and 2022 using a sample-based approach. Sunflower area was estimated at 7.10 +/- 0.45 million hectares (Mha) in 2021 which was reduced to 6.75 +/- 0.45 Mha in 2022, reflecting a 5% decrease compared to the preceding year. The reduction was mainly observed in the Russian-occupied regions while we did not find significant changes in sunflower areas in Ukrainian-controlled areas. In addition to traditional sunflower producing regions in the south and south-east of Ukraine we found new sunflower emerging hotspots along the south-central and north-eastern regions. Overall, the decrease in sunflower planted area was less severe than previously expected and reported in media for the entire Ukraine. This study demonstrates the utility of Earth observation data, namely Sentinel-1/ SAR, for monitoring sunflower cultivation areas in regions where ground access is not possible or feasible due to armed conflict.
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页数:14
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