Development Of WebGIS-based Soil Pollution Assessment And Three-dimensional Visualization System

With the development of urbanization and industrialization,soil contamination becomes increasingly serious.Currently,there is a great demand about the dynamics statistics of soil pollution data for environmental protection and agriculture departments.While labour statement is laborious and inefficient and it could not satisfy the demand of multidimensional statistics.Besides,the soil samples collected from contaminated sites usually contains depth attribute.The traditional WebGIS has gradually failed to meet the needs of three-dimensional soil survey data display.Therefore,it could be more intuitively showing the trend of pollution in three-dimensional space using threedimensional visualization technology.We collect and integrates the soil sample data from farmland and from contaminated site and the three-dimensional modeling data of surface oblique photogrammetry.Then we use the front-end technology of vue.js,the Server map service of Arc GIS,Java Script map development interface of Arc GIS API,Cesium map development library,and Echarts chart control library to design and develop the soil pollution evaluation and three-dimensional visualization system based on WebGIS.The main contents and results are as follows:(1)We evaluated and analyzed the contamination risk for farmland soil and contaminated sites,respectively based on environmental quality standard for soils.The evaluated data was then imported into SQL Server geodatabase through Arc SDE.And we designed standardized for the database table according to the needs of the system.Then we developed farmland soil contamination database and contaminated sites database as the data support of the system map display.(2)The spatial data of the soil contamination database was released map service through Arc GIS for Server.Then we used Arc GIS API for Java Script integrated by Vue.Js invoking REST API to design soil contamination module,so as to realize the function of space display and attribute query for farmland soil contamination evaluation data of our study area.Besides we used Echarts integrated by Vue.js to develop dynamic statistics module to realize the dynamic chart statistics of farmland soil contamination data.(2)The UAV oblique photogrammetry technology was used for field survey of study area.And after geometric correction,image matching etc.,we obtained the surface three-dimensional data of the study area by three-dimensional modeling.Then we used Vue.js and Cesium to develop contaminated sites module based on the soil survey sampling data from contaminated sites and surface three-dimensional data,so as to realize the three-dimensional scene control and three-dimensional visualization of contaminated sites.(4)We integrated farmland soil contamination module and contaminated sites module and developed the soil contamination evaluation and three-dimensional visualization system based on WebGIS.The system provides support and assistance for the personnel of environmental protection,agriculture or other relevant departments with the functions of soil contamination evaluation,dynamic chart statistics of soil contamination and three-dimensional visualization of contaminated sites,and provides help for soil contamination prevention,early warning,remediation and treatment.