| NIRsoil {prospectr} | R Documentation |
NIRSoil
Description
Soil spectral library of the ‘Chimiometrie 2006’ challenge. The database contains absorbance spectra of dried and sieved soil samples measured between 1100 nm and 2498 nm at 2 nm interval. The soil samples come from agricultural fields collected from all over the Walloon region in Belgium. Three parameters are associated with the spectral library: Nt (Total Nitrogen in g/Kg of dry soil), CEC (Cation Exchange Capacity in meq/100 g of dry soil) and Ciso (Carbon in g/100 g of dry soil). Carbon content has been measured following the ISO14235 method.
Usage
data(NIRsoil)
Format
A data.frame of 825 observations and 5 variables (where the spectral
data is embedded in one variable NIRSoil$spc).
Details
The dataset includes 618 training and 207 test samples with 5 variables:
Nt (Total Nitrogen).
Ciso (Carbon).
CEC (Cation Exchange Capacity).
train (binary vector indicating training (1) and validation (0) samples).
and spc (a matrix of spectral NIR absorbance values, where the band/wavelength positions are stored as
colnames).
Nt, Ciso and CEC have respectively 22 \ with missing values.
Source
Pierre Dardenne from Walloon Agricultural Research Centre, Belgium.
References
Fernandez Pierna, J.A., and Dardenne, P., 2008. Soil parameter quantification by NIRS as a Chemometric challenge at 'Chimiometrie 2006'. Chemometrics and Intelligent Laboratory Systems 91, 94-98.