Taper, Volume and Bark Thickness Models for Spruce, Pine and Birch in Norway // Stem taper, bark thickness, and volume models for the main Norwegian tree species (Norway spruce, Scots pine, and birch), based on Hansen et al. (2023) doi:10.1080/02827581.2023.2243821 and the correction doi:10.1080/02827581.2024.2358467. Provides functions to predict stem diameter along the bole, bark thickness, and stem volume by numerical integration of the taper curve, and to invert these relationships (e.g. estimating height and diameter at breast height from measured diameters).