| China is a country with a large population.Food security is related to the prosperity and development of the national economy and the stability of the social environment.Ensuring food security mainly relies on real-time monitoring and daily inspection of the grain storage process.The collected grain situation data is managed and analyzed through the granary management system.Grain management systems therefore play an indispensable role in ensuring food security.Traditional silo management systems are generally desktop-based software.It records and displays relevant food storage information based on pictures and table files,and then analyzes and processes the data by manual verification.Therefore,the existing granary management system Inefficiency is difficult to fully apply to daily work.At this stage,more and more experts and scholars have put forward their own research content and results on the granary management system,but most of the research content is still on the desktop,and there is no combination of three-dimensional real-world models and grain situation data.Most 3D management systems are restricted by related 3D plug-ins,making it difficult to seamlessly browse across platforms.In order to solve the limitations of hardware configuration,operating system and related three-dimensional plug-ins in the existing granary management system,and to improve the visualization of the grain situation data,based on the three-dimensional WebGIS theory,With the aid of 3D visualization technology,a browser-side 3D granary visualization system is implemented.The main research contents include:(1)A granary visualization system based on 3D WebGIS is constructed.Based on the three-dimensional WebGIS theory,with the help of the newly developed WebGL technology,using the better three-dimensional visualization engine in WebGL-Three.js,through the research on the visualization model of the grain data,the visualization model is combined with the three-dimensional real-world model Constructed a three-dimensional visualization system of the granary running on mobile devices and PC browsers,which solved the problem that the traditional granary management system cannot cross-platform and plug-in-free browsing.(2)It realizes the loading and rendering of large-scale 3D scene model on the browser side.In the 3D model construction stage,the amount of model file data is reduced by reducing the solid object model,and the original model file is converted into GLTF model file according to the GLTF model conversion method,which reduces the amount of file data while maintaining consistency with the original model.The real-world model of the scope is rendered on the browser side and the loading time is too long or the page is unresponsive.(3)A 3D visualization model based on grain situation data was constructed.Introduce the concept of spatial model in GIS theory,realize the solid object model in threedimensional space through the corresponding spatial relationship of grain situation data,and combining with the real scene model of 3D granary,the 3D data visualization model of grain situation is constructed.Different visualization models of grain situation data are divided according to the functions of the system and integrated into the various functional modules of the system,which solves the problems of the single form of traditional grain situation data and the low degree of visualization.(4)Realize the functions of 3D video surveillance and library area roaming.According to the real geographic coordinates of the surveillance camera and the CAD point map,a three-dimensional solid model of the surveillance camera is constructed,and on this basis,the user's first-person library area roaming function is realized.The user clicks on the current corresponding camera model while roaming to obtain real-time video surveillance images at the current point,which solves the problems of the lack of real geographic information in traditional video surveillance functions and the lack of immersion when users browse. |
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