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Their impact on spatial and temporal changes can be assessed by studying satellite images acquired at different times. The methodology for detecting changes is continually improving with the use of new image processing techniques. Changes resulting from destructive events can be used to assess their effectiveness. Agriculture in southern Ukraine has been catastrophically affected by military actions, which have led to the degradation of the agricultural landscape structure. One of the manifestations of this process is the destruction and fragmentation of linear contours of agricultural landscapes such as cropland boundaries, field roads, irrigation infrastructure, forest stands, etc. The study assesses the potential of using structural features of object contours, such as their total extent and contrast, in satellite image bands to monitor alterations in the condition of agricultural landscapes. A methodology is proposed to analyze the dynamics of cultivated land development or degradation by analyzing a developed Contour Density Indicator (CDI). The CDI was applied to assess changes in the configuration of an agricultural region in southern Ukraine from 2020 to 2024 using Sentinel-2 images. This period includes 2.5 years of military operations of varying intensity. Analysis of Sentinel-2 images demonstrated a systematic decline in CDI modal values from 2022 to 2023, with the strongest decrease observed within the 30-km-wide battle-line zone, where CDI mode dropped by up to 55% relative to 2020. In contrast, Ukrainian-controlled areas showed a partial recovery of CDI values in 2024, while the buffer zone continued to exhibit persistent loss of contour density, indicating sustained degradation of the agricultural landscape. The results enabled the identification of zones with signs of agricultural degradation resulting from depopulation caused by military activity and the subsequent decline in cultivation intensity. The methodology can be used for operational monitoring of agricultural regions and for making informed management decisions regarding land use in both wartime and peacetime.<\/jats:p>","DOI":"10.1371\/journal.pone.0349631","type":"journal-article","created":{"date-parts":[[2026,5,22]],"date-time":"2026-05-22T17:41:36Z","timestamp":1779471696000},"page":"e0349631","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Assessment of agricultural region dynamics using object contour properties from Sentinel-2 images"],"prefix":"10.1371","volume":"21","author":[{"given":"Serhii","family":"Nikulin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7345-2209","authenticated-orcid":true,"given":"Kateryna","family":"Sergieieva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oleksandr","family":"Kovrov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anton","family":"Kozhevnykov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olga","family":"Korobko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2026,5,22]]},"reference":[{"issue":"3","key":"pone.0349631.ref001","doi-asserted-by":"crossref","DOI":"10.33002\/nr2581.6853.0703ukr20","article-title":"The Role of Ukraine in Ensuring Global Food Security: Current Challenges and Prospects","volume":"7","author":"V Halkin","year":"2024","journal-title":"GJNR"},{"issue":"5","key":"pone.0349631.ref002","doi-asserted-by":"crossref","first-page":"550","DOI":"10.3390\/agriculture15050550","article-title":"The Russia\u2013Ukraine Conflict: A Global Impact Assessment in the Corn and Wheat Sectors","volume":"15","author":"NA Arreyndip","year":"2025","journal-title":"Agriculture"},{"issue":"22","key":"pone.0349631.ref003","doi-asserted-by":"crossref","first-page":"4207","DOI":"10.3390\/rs16224207","article-title":"Impact of Arable Land Abandonment on Crop Production Losses in Ukraine During the Armed Conflict","volume":"16","author":"K Dai","year":"2024","journal-title":"Remote Sensing"},{"key":"pone.0349631.ref004","volume-title":"The importance of Ukraine and the Russian Federation for global agricultural markets and the risks associated with the war in Ukraine","author":"Food and Agriculture Organization","year":"2022"},{"issue":"1","key":"pone.0349631.ref005","doi-asserted-by":"crossref","DOI":"10.1038\/s43247-024-01488-3","article-title":"Quantification of losses in agriculture production in eastern Ukraine due to the Russia-Ukraine war","volume":"5","author":"B Chen","year":"2024","journal-title":"Commun Earth Environ"},{"key":"pone.0349631.ref006","doi-asserted-by":"crossref","first-page":"159","DOI":"10.1080\/00207233.2024.2314889","article-title":"The impact of war on the fields of Ukraine","volume":"81","author":"A Nasibov","year":"2024","journal-title":"Int J Environ Stud"},{"key":"pone.0349631.ref007","first-page":"839","article-title":"Analysis of the impact of the war on the economic state of agriculture in Ukraine","volume":"68","author":"BR Rexhepi","year":"2023","journal-title":"Econ Aff"},{"issue":"1","key":"pone.0349631.ref008","first-page":"015003","article-title":"Crop area change in the context of civil war in Tigray, Ethiopia","volume":"1","author":"S Peterson","year":"2024","journal-title":"Environ Res: Food Syst"},{"issue":"9","key":"pone.0349631.ref009","doi-asserted-by":"crossref","DOI":"10.1093\/nsr\/nwae304","article-title":"Time-series satellite remote sensing reveals gradually increasing war damage in the Gaza Strip","volume":"11","author":"S Holail","year":"2024","journal-title":"Natl Sci Rev"},{"issue":"1","key":"pone.0349631.ref010","doi-asserted-by":"crossref","first-page":"43","DOI":"10.5604\/01.3001.0054.2828","article-title":"Challenges for the agriculture of Ukraine during the war and directions of its development","author":"H Cherevko","year":"2024","journal-title":"Annals PAAAE"},{"issue":"10","key":"pone.0349631.ref011","doi-asserted-by":"crossref","first-page":"1810","DOI":"10.3390\/land11101810","article-title":"Spatiotemporal Analysis and War Impact Assessment of Agricultural Land in Ukraine Using RS and GIS Technology","volume":"11","author":"Y Ma","year":"2022","journal-title":"Land"},{"issue":"2","key":"pone.0349631.ref012","doi-asserted-by":"crossref","first-page":"246","DOI":"10.3390\/land14020246","article-title":"Identification, Mechanism and Countermeasures of Cropland Abandonment in Northeast Guangdong Province","volume":"14","author":"X Li","year":"2025","journal-title":"Land"},{"key":"pone.0349631.ref013","doi-asserted-by":"crossref","unstructured":"Hnatushenko VV, Sierikova KYu, Sierikov IYu. 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