Development Of Visual Contrastive Analysis System For Forest Tending Effectiveness Monitoring Sample Site Factors

In order to grasp the effect of forest tending timely and accurately,and analyze the effectiveness of forest tending and management program,a fixed sample plot of a certain scale was selected as the main monitoring object during the implementation of the central financial forest tending subsidy policy.To intuitively display the data of sample plot survey,quickly obtain the comparative analysis results of sample plot factor information,grasp the growth and change of sample plot,analyze the impact of different forest tending schemes on forest growth,and establish a visual comparative analysis system for monitoring sample plot factor of forest tending effectiveness.Because of the temporal,spatial and multi-dimensional characteristics of the national sample plot monitoring survey data,it is difficult to visually express the spatial distribution of sample plots and the variation of stand growth with time in the traditional single form.In order to excavate the hidden information in survey data and analyze the effect of parenting measures on sample plots,this paper uses data visualization technology to realize the visualization display and analysis function of sample plot data,so that users can observe and study the connotation of different data intuitively and serve for parenting decision-making.This system calls the JavaScript API of Baidu Map to realize the spatial location distribution overview of sample plots.Among the various sample survey factors,the survey data of core sample factors are screened,visualized and visualized by means of images,and the regularity of the data is represented.At the same time,two-dimensional tables are used to show the corresponding nurturing measures of sample plots,and the tables are correlated with image data,or displaying the corresponding nurturing measures at the same time on the scale label of the coordinate axis with time as the transverse coordinate axis to facilitate user analysis.The basic data is classified and counted,and the results are displayed in a variety of data forms and visual charts,which improves the degree of data visualization.The charts dynamically generated by the system have built-in functional components for interaction between users and data,which enhances the means of interaction between users and data.The second group of sample plots in Yongan Forestry Farm of Sanming Forestry Bureau of Fujian Province were compared and analyzed by using this system.According to the visualization results of sample plot factor data,it was shown that the forest tending measures on the sample plots had a certain role in promoting its growth.