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Monitoring of winter wheat growth in categories of frost damage and production potential using SAR and optical images
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Optical sensing is often limited in Central Europe due to cloud cover; therefore, synthetic aperture radar data is increasingly being used. 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Optical sensing is often limited in Central Europe due to cloud cover; therefore, synthetic aperture radar data is increasingly being used. However, synthetic aperture..." /> <meta name="citation_title" content="Monitoring of winter wheat growth in categories of frost damage and production potential using SAR and optical images" /> <meta name="citation_doi" content="10.31545/intagr/195732" /> <meta name="dc.identifier" content="doi:10.31545/intagr/195732" /> <meta name="citation_journal_title" content="International Agrophysics" /> <meta name="citation_issn" content="0236-8722" /> <meta name="citation_issn" content="2300-8725" /> <meta name="citation_volume" content="39" /> <meta name="citation_issue" content="2" /> <meta name="citation_publisher" content="Bohdan Dobrzański Institute of Agrophysics Polish Academy of Sciences" /> <meta name="citation_language" content="english" /> <meta name="citation_journal_abbrev" content="Int. Agrophys." /> <meta name="citation_author" content="Miloš Láznička" /> <meta name="citation_author" content="Lukáš Tůma" /> <meta name="citation_author" content="Věra Vandírková" /> <meta name="citation_author" content="Marie Wohlmuthová" /> <meta name="citation_author" content="Martin Kotek" /> <meta name="citation_author" content="František Kumhála" /> <meta name="citation_author" content="Jitka Kumhálová" /> <meta name="citation_publication_date" content="2025/01/28" /> <meta name="citation_online_date" content="2025/01/28" /> <meta name="citation_firstpage" content="99" /> <meta name="citation_lastpage" content="111" /> <meta name="citation_fulltext_world_readable" content="" /> <meta name="citation_pdf_url" content="http://www.international-agrophysics.org/pdf-195732-120837?filename=Monitoring of winter.pdf" /> <meta name="citation_keywords" content="Sentinel-1; polarizations; spring frost; field variability; logistic regression model" /> <title> Monitoring of winter wheat growth in categories of frost damage and production potential using SAR and optical images </title> <script type="text/javascript" src="https://platform-api.sharethis.com/js/sharethis.js#property=647f0be740353a0019caf2e3&product=inline-share-buttons&source=platform" async="async"></script> <!-- Google Analytics --> </head> <body> <div class="container-fluid"> <div class="d-none d-md-block"> </div> <div class="d-block d-md-none"><!-- mobile menu --> <div class="mMenu"> <a href="#" onclick="$('#mMenuCollapse').slideToggle(400); 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}); </script> <div class="subtitleUnderline"></div> <div class="magAbstractAuthors"> <div class="dirLeft"> <div class="dirLeft " id="author_292396" onmouseover="highlightAffs('1', 1, 292396); return false;" onmouseout="highlightAffs('1', 0, 292396); return false;"> <a href="http://www.international-agrophysics.org/Author-Miloš-Láznička/292396" class="black">Miloš Láznička</a> <span class=""> <sup> 1 </sup> </span> </div> <div class="dirLeft"><a href="mailto:laznickam@tf.czu.cz"><div class="icon icon-envelope-o"></div></a></div> <div class="dirLeft pad-right-5">,</div> <div class="clearAll"> </div> </div> <div class="dirLeft"> <div class="dirLeft " id="author_292397" onmouseover="highlightAffs('1', 1, 292397); return false;" onmouseout="highlightAffs('1', 0, 292397); return false;"> <a href="http://www.international-agrophysics.org/Author-Lukáš-Tůma/292397" class="black">Lukáš Tůma</a> <span class=""> <sup> 1 </sup> </span> </div> <div class="dirLeft"><a href="mailto:ltuma@tf.czu.cz"><div class="icon icon-envelope-o"></div></a></div> <div class="dirLeft pad-right-5">,</div> <div class="clearAll"> </div> </div> <div class="dirLeft"> <div class="dirLeft " id="author_292398" onmouseover="highlightAffs('2', 1, 292398); return false;" onmouseout="highlightAffs('2', 0, 292398); return false;"> <a href="http://www.international-agrophysics.org/Author-Věra-Vandírková/292398" class="black">Věra Vandírková</a> <span class=""> <sup> 2 </sup> </span> </div> <div class="dirLeft"><a href="mailto:vandirkova.vera@gmail.com"><div class="icon icon-envelope-o"></div></a></div> <div class="dirLeft pad-right-5">,</div> <div class="clearAll"> </div> </div> <div class="dirLeft"> <div class="dirLeft " id="author_149540" onmouseover="highlightAffs('3', 1, 149540); return false;" onmouseout="highlightAffs('3', 0, 149540); return false;"> <a href="http://www.international-agrophysics.org/Author-Marie-Wohlmuthová/149540" class="black">Marie Wohlmuthová</a> <span class=""> <sup> 3 </sup> </span> </div> <div class="dirLeft"><a href="mailto:wohlmuth@tf.czu.cz"><div class="icon icon-envelope-o"></div></a></div> <div class="dirLeft pad-right-5">,</div> <div class="clearAll"> </div> </div> <div class="dirLeft"> <div class="dirLeft " id="author_292399" onmouseover="highlightAffs('2', 1, 292399); return false;" onmouseout="highlightAffs('2', 0, 292399); return false;"> <a href="http://www.international-agrophysics.org/Author-Martin-Kotek/292399" class="black">Martin Kotek</a> <span class=""> <sup> 2 </sup> </span> </div> <div class="dirLeft"><a href="mailto:kotekm@tf.czu.cz"><div class="icon icon-envelope-o"></div></a></div> <div class="dirLeft pad-right-5">,</div> <div class="clearAll"> </div> </div> <div class="dirLeft"> <div class="dirLeft " id="author_149542" onmouseover="highlightAffs('1', 1, 149542); return false;" onmouseout="highlightAffs('1', 0, 149542); return false;"> <a href="http://www.international-agrophysics.org/Author-František-Kumhála/149542" class="black">František Kumhála</a> <span class=""> <sup> 1 </sup> </span> </div> <div class="dirLeft"><a href="mailto:kumhala@tf.czu.cz"><div class="icon icon-envelope-o"></div></a></div> <div class="dirLeft pad-right-5">,</div> <div class="clearAll"> </div> </div> <div class="dirLeft"> <div class="dirLeft " id="author_112265" onmouseover="highlightAffs('2', 1, 112265); return false;" onmouseout="highlightAffs('2', 0, 112265); return false;"> <a href="http://www.international-agrophysics.org/Author-Jitka-Kumhálová/112265" class="black">Jitka Kumhálová</a> <span class=""> <sup> 2 </sup> </span> </div> <div class="dirLeft"><a href="mailto:kumhalova@tf.czu.cz"><div class="icon icon-envelope-o"></div></a></div> <div class="dirLeft"> <a href="https://orcid.org/0000-0002-0867-411X" target="_blank"><div class="icon icon-orcid"></div></a> </div> <div class="clearAll"> </div> </div> <div class="clearAll"> </div> </div> <div style="height: 10px;line-height: 10px;font-size: 0;"> </div> <a class="articleDetails" href="#" onclick="$('#articleDetailsId').toggle(200); $('#moreDetailsId').toggle(); $('#hideDetailsId').toggle(); $('[rel=contributionRel]').toggle(200); return false; " id="moreDetailsId"><div class="dirLeft icon icon-angle-down"></div>More details</a> <a class="articleDetails" href="#" onclick="$('#articleDetailsId').toggle(200); $('#hideDetailsId').toggle(); $('#moreDetailsId').toggle(); $('[rel=contributionRel]').toggle(200); return false; " id="hideDetailsId"><div class="dirLeft icon icon-angle-up"></div>Hide details</a> <div id="articleDetailsId"> <div class="affiliations"> <div class="simple-list"> <div class="list-row-small" id="aff_1" onmouseover="highlightAuthors('292396,292397,149542', 1, 1); return false;" onmouseout="highlightAuthors('292396,292397,149542', 0, 1); return false;"> <div class="dirLeft w-23px pad-left-4 em-08">1</div> <div class="dirLeft w-100-c23 em-095">Department of Agricultural Machines, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Prague 6-Suchdol, Czech Republic</div> <div class="clearAll"> </div> </div> <div class="list-row-small" id="aff_2" onmouseover="highlightAuthors('292398,292399,112265', 1, 2); return false;" onmouseout="highlightAuthors('292398,292399,112265', 0, 2); return false;"> <div class="dirLeft w-23px pad-left-4 em-08">2</div> <div class="dirLeft w-100-c23 em-095">Department of Vehicles and Ground Transport, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Prague 6-Suchdol, Czech Republic</div> <div class="clearAll"> </div> </div> <div class="list-row-small" id="aff_3" onmouseover="highlightAuthors('149540', 1, 3); return false;" onmouseout="highlightAuthors('149540', 0, 3); return false;"> <div class="dirLeft w-23px pad-left-4 em-08">3</div> <div class="dirLeft w-100-c23 em-095">Department of Mathematics, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Prague 6-Suchdol, Czech Republic</div> <div class="clearAll"> </div> </div> </div> <div class="simple-list pad-top-12 pad-bot-10"> <div class="list-row-small-2"> <div class="dirLeft w-23px"> </div> <div class="dirLeft w-100-c23 em-08">Final revision date: 2024-10-22</div> <div class="clearAll"> </div> </div> <div class="list-row-small-2"> <div class="dirLeft w-23px"> </div> <div class="dirLeft w-100-c23 em-08">Acceptance date: 2024-11-08</div> <div class="clearAll"> </div> </div> <div class="list-row-small-2"> <div class="dirLeft w-23px"> </div> <div class="dirLeft w-100-c23 em-08">Publication date: 2025-01-28</div> <div class="clearAll"> </div> </div> </div> <div class="simple-list"> <div class="list-row-small"> <div class="dirLeft w-23px"> </div> <div class="dirLeft w-100-c23"> <div class="em-085"><b>Corresponding author</b></div> <div class="em-095"> <a href="http://www.international-agrophysics.org/Author-Jitka-Kumhálová/112265" class="corrAuthorLink" class="black">Jitka Kumhálová</a> <a href="mailto:kumhalova@tf.czu.cz"><div class="icon icon-envelope-o"></div></a><br/> Department of Vehicles and Ground Transport, Czech University of Life Sciences Prague, Czech Republic </div> </div> <div class="clearAll"> </div> </div> </div> </div> </div> <script type="text/javascript"> function highlightAuthors(a, on, aff){ var a = a.split(','); 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Agrophys. 2025, 39(2): 99-111</div> <!-- --> <div class="magBibliography2"> <div class="dirLeft" style="padding-top: 7px; padding-right: 10px;"> <a href="https://doi.org/10.31545/intagr/195732"><div class="dirLeft icon icon-angle-right"></div>DOI: <span class="magBibliographyDOI">https://doi.org/10.31545/intagr/195732</span></a> </div> <div class="clearAll"> </div> </div> </div> <div class="clearAll"> </div> <div class="abstractButtons"> <a class="abstractFullText dirLeft" target="_blank" onclick="pdfStats(195732);return true;" href="http://www.international-agrophysics.org/pdf-195732-120837?filename=Monitoring of winter.pdf"> <div class="abstractFullTextButton dirLeft"> <div class="dirLeft icon icon-file-pdf-o"></div> Article <span class="block">(PDF)</span> </div> </a> <a href="#references" class="abstractLink dirLeft"> <span class="block">References</span><span class="block"> </span><span class="block">(62)</span> </a> <div class="clearAll"> </div> </div> Data availability: The data used for this paper is available upon request from the corresponding author. The data used in this study were downloaded from the Copernicus Open Access Hub and Czech Cadastre. <div class="highlights"> <div class="abstractLabel">HIGHLIGHTS</div> <div class=""> <ul> <li>Information from SAR images can be used to assess within field variability</li> <li>RVI, VH and VV polarization showed differences between observed categories</li> <li>Logistic regression model resulted better for higher spatial resolutions</li> <li>Modern statistical methods bring information from SAR closer to practical use</li> </ul> </div> </div> <div class="abstractLabel">KEYWORDS</div> <div class="abstractContent"> <a href="http://www.international-agrophysics.org/Keyword-Sentinel-1/268518" class="singleKeyword">Sentinel-1<div class="icon icon-circle dirRight"></div></a><a href="http://www.international-agrophysics.org/Keyword-polarizations/601973" class="singleKeyword">polarizations<div class="icon icon-circle dirRight"></div></a><a href="http://www.international-agrophysics.org/Keyword-spring+frost/507140" class="singleKeyword">spring frost<div class="icon icon-circle dirRight"></div></a><a href="http://www.international-agrophysics.org/Keyword-field+variability/601974" class="singleKeyword">field variability<div class="icon icon-circle dirRight"></div></a><a href="http://www.international-agrophysics.org/Keyword-logistic+regression+model/132993" class="singleKeyword">logistic regression model</a> <div class="clearAll"> </div> </div> <div class="abstractLabel">TOPICS</div> <div class="abstractContent"> <a href="http://www.international-agrophysics.org/Topic-Agricultural+and+Biosystems+Engineering/18912" class="singleKeyword">Agricultural and Biosystems Engineering<div class="icon icon-circle dirRight"></div></a><a href="http://www.international-agrophysics.org/Topic-Crop+Responses+to+Abiotic+Stresses/18960" class="singleKeyword">Crop Responses to Abiotic Stresses</a> <div class="clearAll"> </div> </div> <div class="abstractLabel">ABSTRACT</div> <div class="abstractContent realAbstract" >Remote sensing plays an increasingly important role in agriculture, especially in monitoring the quality of agricultural crops. Optical sensing is often limited in Central Europe due to cloud cover; therefore, synthetic aperture radar data is increasingly being used. However, synthetic aperture radar data is limited by more difficult interpretation mainly due to the influence of speckles. For this reason, its use is often limited to larger territorial units and field blocks. The main aim of this study therefore was to verify the possibility of using satellite synthetic aperture radar images to assess the within-field variability of winter wheat. The lowest radar vegetation index values corresponded to the area of the lowest production potential and the greatest damage to the stand. Also for VH and VV polarizations, the highest values corresponded to the area of the lowest stand quality. Qualitative changes in the stand across the zones defined by frost damage and production potential were assessed with the help of the logistic regression model with resampled data for 10, 50, and 100 m pixel size. The best correlation coefficients were achieved at a spatial resolution of 50 m for both options. The F-score still yielded a promising result ranging from 0.588 to 0.634 for frost damage categories. The regression model of the production potential performed slightly better in terms of the F-score, recall, and precision at higher resolutions. It was proved that modern statistical methods could be used to reduce problems associated with speckles of radar images for practical purposes.</div> <a class="anchor" id="acknowledgements"></a> <div class="abstractLabel">ACKNOWLEDGEMENTS</div> <div class="abstractContentReal"> <div class="">We would like to thank to the management of agriculture company Lupofyt for providing agronomic data.</div> </div> <a class="anchor" id="funding"></a> <div class="abstractLabel">FUNDING</div> <div class="abstractContentReal"> <div class="">This work was supported by the Ministry of Agriculture of the Czech Republic, research project NAZV QK 22010014; and Internal Grant of Faculty of Engineering CZU 2021:31150/1312/3113.</div> </div> <a class="anchor" id="conflictOfInterests"></a> <div class="abstractLabel">CONFLICT OF INTEREST</div> <div class="abstractContentReal"> <div class="">The authors declare that they have no conflict of interest.</div> </div> <a class="anchor" id="references"></a> <div class="abstractLabel"><span class="block">REFERENCES</span><span class="block"> </span><span class="block">(62)</span></div> <div class="abstractContent"> <a class="anchor" id="1"></a> <div class="ref" id="ref_1"> <div class="dirLeft refNo">1.</div> <div class="dirLeft refText"> <div style="word-break: break-word;">Atzberger, C., 2013. 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