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By establishing a distributed high complexity C/S architecture, coding CAD/GIS plug-in to achieve the export function, and based on the interactive visualization platform of 3D spatial data, 3DGIS platform was developed, and the virtual mine simulation platform was built by combining VR technology. The results show that the virtual mine simulation system can classify the internal operation program, separate the external display operation from the internal logic operation, and the system operation delay is low, efficient and stable. The system has a strong vertical transfixtion ability of spatial data and realizes the integration of different dimensional data. The system has unique advantages in dynamic visualization of mine objects. On the basis of restoring various physical and geographic information of mines, it can be independently set and select the information of simulated scenes.

The similarities and differences between industry foundation classes (IFC) and city geography markup Language (CityGML) are analyzed in terms of geometric expression and semantic information. A transformation method between IFC and CityGML for utility tunnel is established including semantic extraction, geometry and coordinate system transformation. Then the transformation experiment of utility tunnel in Liupanshui city is carried out and the results show that the mapping rules of the IFC utility tunnel model and the CityGML utility tunnel model can realize the transformation of the IFC utility tunnel model to the CityGML model, at the same time, the converted CityGML utility tunnel model contains the property information extracted by the IFC model, which can be used for the integration of three dimension geographical information system (3DGIS) and building information modeling (BIM), it helps to promote the life cycle management of urban underground utility tunnels. [ABSTRACT FROM AUTHOR]

In cities, the main source of air pollutants is vehicle exhaust. It has become an urgent problem for many cities to explore the law of vehicle exhaust diffusion and actively seek for improvement measures. At present, there are many researches on the simulation of vehicle exhaust diffusion, but few on the modeling of diffusion process and volume visualization analysis. This paper integrates California line source dispersion model‐4(CALINE4) model and 3DGIS to solve the problem of urban vehicle exhaust diffusion simulation and dynamic visualization. Firstly, a street‐scale framework of vehicle exhaust diffusion simulation and visualization is established, and a continuous concentration field is established to express the diffusion processing. A unified data model is used in the semantic space to integrate the data of buildings, roads, trees and dynamic diffusion process data. Secondly, a graphics processing unit ‐ based direct volume rendering method is used to visualize the dynamic diffusion data, and this algorithm is improved in real‐time gradient calculation, texture sampling and time‐based interpolation. Finally, this paper analyzes the vehicle exhaust diffusion of a road in the central business district area of Beijing. The experimental results show that the coupling application of 3DGIS and CALINE4 model can better reveal the spatial and temporal distribution characteristics of urban vehicle exhaust and concentration, which verifies the reliabless and efficiency of the proposed method. [ABSTRACT FROM AUTHOR]

A display implementation method of coal mine business data based on 3DGIS was put forward. The method adopts way of data center to manage basic spatial data and business system data. Combining with 2DGIS and 3DGIS, it can comprehensively and intuitively show coal mine business data taking desktop platform and Web platform as the carrier. The method not only can provide intuitive and efficient way of data acquisition and perception for coal users, but also can provide functions of efficient space analysis and hidden information mining.

A single architecture cannot meet the demand for the development of an emergency early warning auxiliary decision system.In order to solve this problem,a microservice architecture is introduced to design and develop the system.By analyzing the advantages of applying a microservice architecture in a complex systeminstead of a traditional monomer-type structure,we designed a microservice architecture based on the emergency early warning information release auxiliary decision system. This system selects the Spring Cloud service framework, and makes an appropriate extension on itto create the registry and gateway based on the system design.The system adopts a 2D and 3D integrated geographic information system as the display platform.By accessing the static monitoring data and hazard source dymamic monitoring data on various industries, the system can integrate and processes data according to the set mode,and assists in command and decision-making in the early warning information generation,release,and emergency response stages.This design scheme lias been applied tothe Hubei province emergency early warning and release aided decision system.The rationality and effectiveness of this kind of system,which uses a microservice architecture, has been verified. [ABSTRACT FROM AUTHOR]

Aiming at the demands of quick visualization and dynamic information management of large-scale wind farm, a Skyline-based method was proposed for dynamically constructing three-dimensional scenes of wind turbine generator system(WTGS). The proposed method firstly utilized Terra Builder software to generate 3D basic terrain scenes for Wind Farm. Then 3D refined models of tower, nacelle and wind turbine rotor were unifiedly built by Skech Up tools, respectively. Finally, the 3D model of wind farm was dynamically constructed by combining three 3D refined models according to the associated position and attribute information. The results indicate that our method can rapidly realize 3D representation and dynamic simulation of wind turbine generators. [ABSTRACT FROM AUTHOR]

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The visualization of the traditional 3DGIS is relatively backward and difficult to meet the needs of some practical applications. To improve the simulation fidelity of 3DGIS, we apply the most popular deferred shading technology to the 3DGIS and combine with the physical BRDF illumination model, SSAO and HDR technology, to propose a new 3DGIS rendering method (named as BSHRF). The physical BRDF illumination model improves the material effect of 3DGIS. The SSAO technology improves the light details of scene reality using cheap computing; the HDR technology raises the image fidelity one level again. Finally, to validate the proposed method is feasible and advanced, the vegetation scene and 3D building scene are rendered respectively using the BSHRF method in a 3DGIS software platform Gaea explorer, and the BSHRF method is compared with the current popular 3DGIS software Google Earth and ArcScene from two aspects of the rendering quality and efficiency. The results show that the BSHRF method can get a better rendering fidelity under the condition of no loss of rendering efficiency. [ABSTRACT FROM AUTHOR]

The current two causes of poor train quality of coal special operators were analyzed. It was indicated that the main cause of ineffective training of coal special operators was backwardness of training means. The defect of training and teaching software which was developed with traditional virtual reality technology was analyzed. The characteristics of virtual reality technology development platform based on three-dimensional geographic information system were introduced. The advantages of training software for special operators based on 3DGIS were analyzed. A new idea to improve the quality of safety training for coal special operators was provided by the virtual reality teaching means.