Development Of Multi-dimensional Visualization System For Site Soil Contaminants Using The Cesium Virtual Globe

Site soil contamination is an important factor that affects the construction of ecological civilization and threatens the ecological security of China for a long time.Conducting spatial and temporal analysis helps to scientifically carry out assessment and management studies of site soil contamination.Cesium is an excellent earth data visualization engine.In the thesis,a multi-dimensional visualization analysis platform for site soil contaminants is implemented based on Cesium to improve the information management of soil contaminant data and provide assistance for refined management and comprehensive pollution prevention of site soil.The following research work is accomplished in the thesis:(1)According to the characteristics of site soil contaminant data,the thesis analyzes the data relationship between site,plot,point,sampling interval and sampling point,and designs the table structure and establishes a thematic database of site soil contaminants that contains data on 4 different soil physical and chemical properties and33 soil contaminants.(2)Based on the Cesium Digital Earth platform,the "Multi-dimensional Visualization System for Site Soil Contaminants"(hereinafter referred to as the "system")(http://www.9dbim.com/visualization/index.html)is designed and developed,with the function of user-defined addition of vector data,3D models and other types of auxiliary data,which can realize the organization,monitoring,and visualization of site soil contaminant data and provide a technical platform for accurate analysis of the spatial and temporal distribution characteristics and patterns of site soil contaminants.(3)A four-dimensional dynamic visualization method for the time series data of site soil contaminants is proposed.The thesis designs a process for the production of time-series data on soil contaminant content and organizes it into spatiotemporal dynamic geospatial data unique to Cesium,which can effectively express the dynamic changes of soil contaminant concentrations in space over time and provide support for the traceability and change trend research of site soil contamination.The study designs and develops a multi-dimensional visualization system for site soil contaminants based on the Cesium Digital Earth platform,proposes a time-series data generation method for site soil contaminants,and realizes the integrated visualization analysis of soil contaminant data in time and space dimensions.The test and application results show that the four-dimensional dynamic visualization technology developed in this study provides a new method for the environmental protection departments to scientifically analyze soil contamination,which can significantly improve the visualization effect and comprehensive analysis capability of site soil contaminant data,and provide valuable reference for scientific formulation of pollution management strategies.