Evaluation of Hyperspectral Data as Predictors for Natural Grassland Biomass
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Abstract
The Pampa Biome represents approximately 63% of the territory in the State of Rio Grande do Sul - Brazil. Due to the continuous incorporation of monocultures of exotic species, agricultural crops and sometimes inadequate practices of livestock production, native fields are rapidly being degraded, fragmented and uncharacterized. Seeking to collaborate in developing new management strategies and appropriate monitoring of natural grassland, with a view to minimizing efforts for field collection, this study aimed to characterize and quantify the relationship between hyperspectral data collected by spectroradiometer as biomass predictors country in two methods pasture management with the aid of field data. The study area are plots of grazing cattle by two methods (treatments) management (day 375 to 750 degrees - DG) which were acquired spectral reflectance curves with spectroradiometer over the range 350-2500 nm wavelength. 10 vegetation indices were used and used along with 11 CO intervals in the regression analyzes. Selected indices and ranges simulated wavelength used in the Sentinel 2 satellite MSI sensor bands, available free of charge since 2015. The results showed strong correlations between the variables and it was found that in the spectral regions of blue, red edge and NDLI and DMCI differed statistically among management methods. The spectral regions of Blue, NIR and SWIR were significantly higher in 750 GD treatment. The most accurate model to biomass estimation involved the EVI and CAI indices with adjusted r² = 0.72 and RMSE = 0.10.
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