![]() At any scale(s), the MTG appears as a simple tree graph, representing the set of plant components at this scale and their topological relationships only two operators ( < and +) are used to describe succession and branching, respectively (Godin et al. internodes, growth units, axes) (Godin et al. An MTG is basically a topological model that can be considered as a set of simple tree graphs indicating succession and branching relationships between plant components and representing a plant at different levels of detail (e.g. ![]() Plant architectures could be also represented by a formal model, called multiscale tree graph (MTG Godin and Caraglio 1998). Range scans were used to measure lengths of fi rst and second order branches, angles of branch intersections, stem sections (length = 1 m) and diameters of branches intersections up to 20 m from the ground. Similar to the direct measurement, the architectural characteristics of stem and branches were analysed in the 3-D structure displayed on the computer screen. ![]() From these measurements we estimated the average basal area (G) and mean stand height (H) of the poplar stand. ![]()
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