Maize crop cycle: vegetation cover analysis using Sentinel-2 derived vegetation indices

Authors

  • Anabela Grifo Instituto Politécnico de Santarém - Escola Superior Agrária; Life Quality Research Center (CIEQV); UI_IPSantarém https://orcid.org/0000-0002-1152-0410
  • António Palminha Instituto Politécnico de Santarém - Escola Superior Agrária; UI_IPsantarém
  • Albertina Ferreira Instituto Politécnico de Santarém - Escola Superior Agrária; Life Quality Research Center (CIEQV); UI_IPSantarém https://orcid.org/0000-0002-3908-8535

DOI:

https://doi.org/10.25746/ruiips.v11.i3.32349

Keywords:

crop vigor, EVI, multispectral images, NDRE, NDVI

Abstract

Vegetation indices are now widely used to assess and characterize vegetation cover. In agriculture, these indices make it possible to obtain information throughout the crop cycle and to act in a timely manner, if necessary.

In this study, different vegetation indices (NDVI - Normalized Difference Vegetation Index, NDRE - Normalized Difference Red Edge Index, EVI - Enhanced Vegetation Index) were calculated to assess vegetative vigor. These indices were obtained from images from the European Space Agency's Sentinel-2 satellite, from May to September 2021. This analysis focused on the maize crop, in a plot located in Ribatejo (38.994975°; -8.369681°). ArcGis TM and Microsoft Excel software were used for data processing.

This work aims to: a) develop thematic vegetation index maps to evaluate maize productivity; b) analyze the behavior of vegetation indices throughout the cultural crop cycle; c) understand which index or indices are more reliable in the more advanced stages of the crop cycle.

The correlation between NDVI and EVI was strong (r=0.95) but EVI showed differences in maize reflectance at stages of the crop cycle where NDVI showed saturation. The NDRE showed a strong correlation with the NDVI (r=0.99). In the stages of the crop cycle in which the soil cover becomes denser, mainly in the vegetative phase of flowering, the NDRE outperformed the EVI and the NDVI, proving to be efficient in the spatial detection of differences in vegetativo vigor.

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Published

2023-12-31

How to Cite

Grifo, A., Palminha, A., & Ferreira, A. (2023). Maize crop cycle: vegetation cover analysis using Sentinel-2 derived vegetation indices. Revista Da UI_IPSantarém, 11(3), 31–32. https://doi.org/10.25746/ruiips.v11.i3.32349

Issue

Vol. 11 No. 3 (2023): Proceedings of the International Conference IMPACT SCIENCE’23

Section

Abstract

License

Copyright (c) 2023 Anabela Grifo, António Palminha, Albertina Ferreira

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