Fig. 3From: Evaluation of estimates of crown condition in forest monitoring: comparison between visual estimation and automated crown image analysisBox plot of the DSO values of four classes categorized by VT and CT. Different letters above each box indicate a significant difference between classes. Median (central thick lines), 25% and 75% percentiles (represented by the box height), upper and lower limits (error bars) and extreme values (circles) are shownBack to article page