{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,15]],"date-time":"2026-03-15T04:45:28Z","timestamp":1773549928393,"version":"3.50.1"},"reference-count":70,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2023,10,18]],"date-time":"2023-10-18T00:00:00Z","timestamp":1697587200000},"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>Quantifying the forage biomass in pastoral systems can be used for enhancing farmers\u2019 decision-making in precision management and optimizing livestock feeding systems. In this study, we assessed the feasibility of integrating Sentinel-1 and Sentinel-2 satellite imagery with machine learning techniques to estimate the aboveground biomass and forage quality of bale grazing and sacrificed grassland areas in Virginia. The workflow comprised two steps, each addressing specific objectives. Firstly, we analyzed the temporal variation in spectral and synthetic aperture radar (SAR) variables derived from Sentinel-1 and Sentinel-2 time series images. Subsequently, we evaluated the contribution of these variables with the estimation of grassland biomass using three machine learning algorithms, as follows: support vector regression (SVR), random forest (RF), and artificial neural network (ANN). The quantitative assessment of the models demonstrates that the ANN algorithm outperforms the other approaches when estimating pasture biomass. The developed ANN model achieved an R2 of 0.83 and RMSE of 6.68 kg\/100 sq. meter. The evaluation of feature importance revealed that VV and VH polarizations play a significant role in the model, indicating the SAR sensor\u2019s ability to perceive changes in plant structure during the growth period. Additionally, the blue, green, and NIR bands were identified as the most influential spectral variables in the model, underscoring the alterations in the spectrum of the pasture over time.<\/jats:p>","DOI":"10.3390\/rs15205014","type":"journal-article","created":{"date-parts":[[2023,10,18]],"date-time":"2023-10-18T10:36:56Z","timestamp":1697625416000},"page":"5014","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Estimation of Bale Grazing and Sacrificed Pasture Biomass through the Integration of Sentinel Satellite Images and Machine Learning Techniques"],"prefix":"10.3390","volume":"15","author":[{"given":"Milad","family":"Vahidi","sequence":"first","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Polytechnic Institute, State University, Blacksburg, VA 24061, USA"}]},{"given":"Sanaz","family":"Shafian","sequence":"additional","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Polytechnic Institute, State University, Blacksburg, VA 24061, USA"}]},{"given":"Summer","family":"Thomas","sequence":"additional","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Polytechnic Institute, State University, Blacksburg, VA 24061, USA"}]},{"given":"Rory","family":"Maguire","sequence":"additional","affiliation":[{"name":"School of Plant and Environmental Sciences, Virginia Polytechnic Institute, State University, Blacksburg, VA 24061, USA"}]}],"member":"1968","published-online":{"date-parts":[[2023,10,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1016\/j.isprsjprs.2016.08.001","article-title":"Progress in the remote sensing of C3 and C4 grass species aboveground biomass over time and space","volume":"120","author":"Shoko","year":"2016","journal-title":"ISPRS J. 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