Abstract:

Individual tree information is significant to the study of stand growth, stand structure, stand management and stand visualization. The Huangfengqiao State-Owned Forest Farm in Hunan Province was selected as a test area. Six typical and pure Chinese fir plantations of the same age were chose as the research objects. The corresponding relationship between the diameter class and the Voronoi polygon area was studied. The following works were carried out by taking simulated plots for example and setting the tree number, the stand arithmetic mean DBH and the plot size. By researching the tree distribution pattern, the generation algorithms of lattices were established. The diameter class distribution was estimated by using the Weibull distribution model. According to the law between the Voronoi polygon area and the diameter class, the diameter class was allocated. The tree height and crown were estimated based on the models of the tree-measuring factors. The visual model of individual tree information estimation based on stand characteristics was established by using GDI+, MOGRE and Arcgis Engine10 development technology that could analyze the Voronoi polygon in the plot. The results showed that there was a positive correlation between the arithmetic mean of Voronoi polygon area and the diameter class, that the generation algorithms of tree distribution patterns were efficient and applicable, that because the allocation of diameter class referred to the impact of space environment, it was closed to the law of tree growth, and that the visual simulation technique could directly express all the processes and the results and enhance the maneuverability. This method that can solve the difficult problem of individual tree information estimation based on stand characteristics can provide the underlying data for forest research and the technical reference for forest visual simulation.

Key words: stand characteristics, individual information, Voronoi diagram, estimation, visual simulation