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.
A data frame of 825 observations and 5 variables
The dataset includes 618 training and 207 test samples with
5 variables: Nt (Total Nitrogen), Ciso (Carbon), CEC
(Cation Exchange Capacity), train (
vector of 0,1
indicating training (1) and validation (0) samples) and spc
matrix with absorbance NIR data and band
colnames). Nt, Ciso and CEC have
respectively 22 %, 11 % and 46 % of the observations
with missing values.
Pierre Dardenne from Walloon Agricultural Research Centre, Belgium.
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.
Minasny, B., and McBratney, A.B., 2008. Regression rules as a tool for predicting soil properties from infrared reflectance spectroscopy. Chemometrics and Intelligent Laboratory Systems 94, 72-79.