Fig. 13

Partial views of the primary OBIA algorithm outputs: a the 4-band multi-layer file with the RGB (a1) and the DSM (a2) layers, showing the results of mechanical and adapted pruning as applied to the trees on the two top and bottom rows, respectively; b chessboard segmentation output; c the coarse classification of the tree (pink colour) and bare soil (white colour) objects based on the difference in DSM (height) values; d the coarse classification of the tree borders (blue color); e pixel-based segmentation of the tree borders; f the fine classification of the tree (green colour) objects; and g the tree and the bare-soil objects were joined with separately. As a result of the whole procedure, the algorithm computed the 3D tree geometric features (projected area, height and volume) and exported the values as vector and table files for further analysis