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
Details
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
(a matrix with absorbance NIR data and band
positions as colnames). Nt, Ciso and CEC have
respectively 22 %, 11 % and 46 % of the observations
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.
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.