{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,30]],"date-time":"2026-03-30T19:44:27Z","timestamp":1774899867635,"version":"3.50.1"},"reference-count":63,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2018,1,30]],"date-time":"2018-01-30T00:00:00Z","timestamp":1517270400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The detection of water stress in vineyards plays an integral role in the sustainability of high-quality grapes and prevention of devastating crop loses. Hyperspectral remote sensing technologies combined with machine learning provides a practical means for modelling vineyard water stress. In this study, we applied two ensemble learners, i.e., random forest (RF) and extreme gradient boosting (XGBoost), for discriminating stressed and non-stressed Shiraz vines using terrestrial hyperspectral imaging. Additionally, we evaluated the utility of a spectral subset of wavebands, derived using RF mean decrease accuracy (MDA) and XGBoost gain. Our results show that both ensemble learners can effectively analyse the hyperspectral data. When using all wavebands (p = 176), RF produced a test accuracy of 83.3% (KHAT (kappa analysis) = 0.67), and XGBoost a test accuracy of 80.0% (KHAT = 0.6). Using the subset of wavebands (p = 18) produced slight increases in accuracy ranging from 1.7% to 5.5% for both RF and XGBoost. We further investigated the effect of smoothing the spectral data using the Savitzky-Golay filter. The results indicated that the Savitzky-Golay filter reduced model accuracies (ranging from 0.7% to 3.3%). The results demonstrate the feasibility of terrestrial hyperspectral imagery and machine learning to create a semi-automated framework for vineyard water stress modelling.<\/jats:p>","DOI":"10.3390\/rs10020202","type":"journal-article","created":{"date-parts":[[2018,1,30]],"date-time":"2018-01-30T05:02:34Z","timestamp":1517288554000},"page":"202","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":124,"title":["Modelling Water Stress in a Shiraz Vineyard Using Hyperspectral Imaging and Machine Learning"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4954-3642","authenticated-orcid":false,"given":"Kyle","family":"Loggenberg","sequence":"first","affiliation":[{"name":"Department of Geography and Environmental Studies, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa"}]},{"given":"Albert","family":"Strever","sequence":"additional","affiliation":[{"name":"Department of Viticulture and Oenology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa"}]},{"given":"Berno","family":"Greyling","sequence":"additional","affiliation":[{"name":"Department of Viticulture and Oenology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9369-4926","authenticated-orcid":false,"given":"Nitesh","family":"Poona","sequence":"additional","affiliation":[{"name":"Department of Geography and Environmental Studies, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa"}]}],"member":"1968","published-online":{"date-parts":[[2018,1,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"5","DOI":"10.1016\/j.agwat.2015.08.021","article-title":"Modern viticulture in southern Europe: Vulnerabilities and strategies for adaptation to water scarcity","volume":"164","author":"Costa","year":"2016","journal-title":"Agric. 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