Fig. 2
dtop and htop estimation visualized for an exemplary spruce plot of the German NFI: The circles mark height and DBH of trees included in the sample. Trees with measured heights are plotted blue. The red dot corresponds to a tree with crown breakage. The uniform height-diameter-curve is overlaid in gray. The histogram shows the number of trees per hectare represented by the sampled tree of a certain DBH. The red line shows the density of the DBH distribution