Abstract

POSADA-ASPRILLA, William  and  CERON-MUNOZ, Mario Fernando. Influence of height and zenith angle of multispectral images on the estimation of kikuyo grass biomass. rev.udcaactual.divulg.cient. [online]. 2019, vol.22, n.2, e1338.  Epub Dec 31, 2019. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v22.n2.2019.1338.

The objective of this study was to analyze the effect of solar zenith angle (morning, noon and afternoon) and the distance (between 10 and 50m) of the multispectral images of kikuyo grasslands for biomass estimation. Spectral data from 40 samples were captured and the normalized vegetation index (NDVI) and the forage biomass of the photographed areas were calculated. The relationship of the biomass with the NDVi was made using generalized additive models. It was found that it is possible to predict the amount of biomass with images taken at noon and the flight heights analyzed (with R2 = 0.99), indicating that grassland monitoring can incorporate sensor information with red and near infrared bands taken between 12:00m and 1:00 pm.

Keywords : generalized additive models; precision farming; remote sensor; vegetation index.

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