Dennis Walvoort

TL;DR: In this article, partial least squares regression (PLSR) was used to construct calibration models which were independently validated for the prediction of various soil properties from the soil spectra, including soil pHCa,p H w, lime requirement (LR), organic carbon (OC), clay, silt, sand, cation exchange capacity, exchangeable calcium (Ca), exchangeable aluminium (Al), nitrate-nitrogen (NO3-N), available phosphorus (PCol), exchangeability potassium (K) and electrical conductivity (EC).

TL;DR: In this article, the spatial distribution of twenty tree species groups over Europe at 1 km × 1 km resolution was mapped using a multinomial multiple logistic regression model with the National Forest Inventory (NFI) plot data.

TL;DR: A new R package for designing spatial coverage samples for mapping, and for random sampling from compact geographical strata for estimating spatial means, with the mean squared shortest distance chosen as objective function.

TL;DR: In this paper, compositional kriging is introduced as a straightforward extension of ordinary Kriging that complies with the constant sum and non-negativity constraints of compositional data.

TL;DR: This work proposed the variance quadtree algorithm for sampling in an area with prior information represented as ancillary or secondary environmental data, and the covariance structure of the anCillary variable is non-stationary.