Uncertainty evaluation in functional kriging with external drift

We predict a curve at an unmonitored site taking into account exogenous variables using a functional kriging model with external drift. To evaluate uncertainty of the predicted curves, a semi-parametric bootstrap approach for spatially correlated data is adapted to functional data. Confidence bands are obtained by ordering the bootstrapped predicted curves in two different ways. The proposed approach is illustrated on pollutant functional data gathered by the monitoring network of Piemonte region (Italy).