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. 2021 Feb 8;11:3336. doi: 10.1038/s41598-021-82797-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Correlations among biomass and four image features. The correlations of image features with observed biomass are demonstrated as Pearson correlation coefficients in the upper triangular area and scatter plots in the lower triangular area. The four image features are standardized within combinations of month and replicate. The medians of correlation coefficients are highlighted in bold text. Months are illustrated by colors and replicates by shapes. The four image features are canopy area, plant height, Normalized Difference Red Edge (NDRE) Index, and Normalized Green–Red Difference Index (NGRDI).