The Three Dimensional Visualization Simulation For Pinus Yunnanensis In Different Degree Of Insect Stress

Modeling three-dimensional tree is the important research content in the subject of forest management.In the process of modeling trees,however,a lot of effort has been dedicated to research tree growth model,few works have paid close attention to leaf colour.This study takes Pinus yunnanensis stands as research objects,which are divided into healthy stand,slight damaged stand,moderate damaged stand and severe damaged stand.Basic experimental data were collected in the four stands.The main research contents and results in this paper are as follows.First,reconstruct the leaf color according to the measured spectral.Simulation the leaf color based on spectral data.The result is good.Second,different degree damaged single trees and stands are modeled by applying the SVS application combine with the spectroscopic data and the basic data of each sample plot.But for Pinus yunnanensis species,the the model of the Pinus yunnanensis species is lack of sense of reality in SVS.In addition,this paper explores the three other different methods to simulate stand visualization.First,draw the contour line of Pinus yunnanensis in the SketchUp,then model the Pinus yunnanensis by crossing the crossover.This method is simple and rapid,but it only can be applied to the trees with straight trunk.It can’t reflect different structures of Pinus yunnanensis,the visualization model is not good.Second,stands can be modeled in SketchUp by using the photos of Pinus yunnanensis.Third,improvement have been done to make more real visualization stand model.Combining with the image processing software Photoshop,the three dimensional visualization models of Pinus yunnanensis can be made by using the drawing tools and the editing tools in SketchUp,which are more realistic.The simulation of the leaf color and the tree structure,is similar to the real tree.It is of great significance for controlling insect pests.