Used for preprocessing predictor data in functions
prepro(X, method = 'bn')
predictors as vector, matrix, raster brick or raster stack
type of preprocessing (currently only brightness normalization coded as “bn”)
The function is called within
The only implemented option is currently “bn”, which is a brightness
normalization according to Feilhauer et al. (2010). Raster brick and raster
stack are objects of package raster.
Returns the transformed matrix or raster object.
Feilhauer. H., Asner, G.P., Martin, R.E., Schmidtlein, S. (2010): Brightness-normalized Partial Least Squares regression for hyperspectral data. Journal of Quantitative Spectroscopy and Radiative Transfer 111: 1947–1957.
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