The Research Of Soil Heavy Mental Pollution Visual Evaluation System Base On HTML5 Lightweight WebGIS Platform

Soil contaminated by heavy metals,as one of the vital factors influencing the food security,has attracted wide attentions from various governments and scientists.With the development of GIS and Web technology,the form of information display is being transforming to be on the WebGIS.Exploiting the modernized WebGIS to demonstrate the spatial information visualization is an optimal way for investigating the situation and extent of soil contaminants by heavy metals,which is much more rapid,efficient,and convenient.Aimed at the current researches on established system for assessing and monitoring the heavy metals in soil,various restrictions has been found that the old technologies limited the developing framework,for example,most computer systems were confined to be installed and used just on the personal computers.As a consequence,these systems were usually slow,and the forms to display spatial distribution were usually very limited.Meanwhile,the abilities of these systems to deal with big data were also very insufficient.To cover the shortages in visualizing the spatial distribution of heavy metals in soil and the disabilities in dealing with the big data,in this study,a new approach and framework is explored to combine the advantages of Web technologies in dealing with big data and the rendering technologies on spatial information for the current requirements in monitoring the spatial distributions of heavy metals in soil on the Web.Based on the requirements of Web systems for monitoring the spatial information of heavy metals in soils and the characteristics of WebGIS technologies,some appropriate mapping engine technologies are evaluated for developing the systems on assessing and monitoring the heavy metals in soils.Meanwhile,to cover the shortages that the current technologies are not good at rendering the spatial distribution of soil contaminants,various schemes are explored to deal the big data,and the optimal scheme is selected and recommended for assessing and monitoring the heavy metals in soil.To better visualize the indices in form of charts and tables,and to simulate the diffusion of heavy metals in soils,the advantages to render E-charts and the thermodynamic chart are also discussed and evaluated.Therefore,with the combination of aforementioned characteristics,in this study,a new web system for assessing and monitoring the spatial information of heavy metals in soil is developed in the thoughts of modularization,and three sub-systems are contained,such as simulating the transforming process of heavy metals in soil,querying the required information both on the tables and maps,as well as matching the dynamic and static routers for resources storage.In addition,this new system exploits the lightweight framework,which incorporates the spatial interpolation technologies,models on assessing the heavy metals in soils,and the spatial mapping technologies.This new system is better at the visualizing the spatial mapping heavy metals in soils both in rapid and high-performance ways,which greatly improve the conveniences in decision-making on assessing the heavy metals in soils.