Research On Visualization Information System Of Forest Tending Sample Plot Based On WebGIS

In the central government forest tending subsidy policy implementation process,in order to grasp the monitoring results,the objective evaluation of output efficiency,selection of a certain scale from the national level as the national fixed sample plots,the establishment of national forest tending plots monitoring the effects of visual information system(hereinafter referred to as the "forest management system").The monitoring data of national sample has the characteristics of multi-resolution,multi-dimensional,temporal,spatial and multi-source,traditional data visualization technology can not completely reveal the hidden information in the monitoring data,the WebGIS(Geographical Information System)technology combined with traditional visualization mining,is convenient for users to explore all kinds of data for.This combination of WebGIS system and other mature technology system,designed the overall architecture of the WebGIS forest tending sample visualization based on information system,and puts forward some ideas and methods of spatial data model and organization of WebGIS forest tending plots were established based on the application requirements of forest tending sample database model,using ArcGIS API for JavaScript to build a forest tending sample management information platform.The main research contents are as follows:(1)To survey and analyze the related results of forest tending effect monitoring,sum up the main scope and content of monitoring,analyze visual demand and functional requirements,and design and realize the main functions of forest tending system.Based on the design idea of integration of database and cartography,the basic framework of unified database is constructed by ArcSDE,and the inf'ormation visualization and dvnamic mapping of forest tending plots based on database are realized.(2)Analysis of forestry data visualization features,expression of forest tending visualization framework and knowledge base,summarizes the multiscale mode elements selection and restriction method,puts forward a set of systematic forest tending sample data of thematic map expression pattern.(3)In-depth study of ArcGIS API for JavaScript framework,and its incomplete function for the expansion of research,completed on the map layer,feature editing,scatter aggregation and chart thematic plans such as the expansion and packaging,for the development of related Learn from.In order to improve the visualization effect,the ECharts chart library is used to graph the data,and the thematic map of the positioning chart is realized to improve the visualization degree of the sample data.