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If this is the paper you are looking for, it focuses on the following:

: Comparing statistical methods—specifically Vegetation Indices (VI) and Partial Least Squares Regression (PLSR) —to predict biochemical and biophysical traits in grasslands.

: You can access it through the ResearchGate link or search for the title on MDPI (where it was published in 2015).

: Using hyperspectral cameras mounted on UAVs (unmanned airborne platforms) to gather high-resolution spectral data.

: The study evaluates how different fertilization types and amounts influence spectral curves and determines which regression models best estimate forage quality markers like crude ash and metabolic energy. How to Proceed