化学事故具有突发性强、环境污染破坏严重、救援难度大等特点,对突发化学事故的影响范围、破坏程度进行快速评估,为事故抢险救援提供决策支持,是应对重特大突发化学事故、降低事故损失的重要手段。本文基于三维地理信息系统(Three-dimen...化学事故具有突发性强、环境污染破坏严重、救援难度大等特点,对突发化学事故的影响范围、破坏程度进行快速评估,为事故抢险救援提供决策支持,是应对重特大突发化学事故、降低事故损失的重要手段。本文基于三维地理信息系统(Three-dimensional Geographic Information System,3D GIS),在充分考虑下垫面影响的前提下,研究了大气污染扩散模型,提出了扩散场快速构建技术及兼顾污染分区的救援力量调度方法,并以此为核心建立了系统总体框架,形成了集扩散模拟、危害分析、救援调度等功能于一体的突发化学事故危害评估与救援辅助决策支持系统,可为突发化学事故危害后果评估与辅助救援决策提供有效的技术支撑。展开更多
为了城市地下管线的可持续发展,要解决传统市政管线管理模式中存在的信息不透明、管理难度大等问题,以实现三维可视化、管线状态监测及视频监控、故障定位等目标。从系统总体架构和系统功能、数据库建设等方面出发,整合应用建筑信息模型...为了城市地下管线的可持续发展,要解决传统市政管线管理模式中存在的信息不透明、管理难度大等问题,以实现三维可视化、管线状态监测及视频监控、故障定位等目标。从系统总体架构和系统功能、数据库建设等方面出发,整合应用建筑信息模型(building information modeling,BIM)技术与三维地理信息系统(three-dimensional geographic information system,3D GIS)技术,提出智慧地下管线系统的建设方案。结合工程实例,应用智慧地下管线系统,分析与评价其应用效果。以期为未来地下管线的巡查、分析、决策提供数据支持,为相关工程提供借鉴。展开更多
Regional Geological Information System combines the multi-dimensional and dynamic spatial information into an integrated spatial information system. 3D geological modeling and its preprocessing or post-processing are ...Regional Geological Information System combines the multi-dimensional and dynamic spatial information into an integrated spatial information system. 3D geological modeling and its preprocessing or post-processing are the most difficult problems for constructing the system. Based on the current 3D GIS technique, some basic problems in establishing the system are discussed in this paper, including 3D spatial data model, 3D geological modeling, and visu- alization of 3D geological data. A kind of 3D vector data model based on boundary representation for geological object and its topology was developed in order to model and visualize complex geological structures. In addition, some key techniques are pointed out for further study.展开更多
The relentless progress in the research of geographic spatial data models and their application scenarios is propelling an unprecedented rich Level of Detail(LoD)in realistic 3D representation and smart cities.This pu...The relentless progress in the research of geographic spatial data models and their application scenarios is propelling an unprecedented rich Level of Detail(LoD)in realistic 3D representation and smart cities.This pursuit of rich details not only adds complexity to entity models but also poses significant computational challenges for model visualization and 3D GIS.This paper introduces a novel method for deriving multi-LOD models,which can enhance the efficiency of spatial computing in complex 3D building models.Firstly,we extract multiple facades from a 3D building model(LoD3)and convert them into individual semantic facade models.Through the utilization of the developed facade layout graph,each semantic facade model is then transformed into a parametric model.Furthermore,we explore the specification of geometric and semantic details in building facades and define three different LODs for facades,offering a unique expression.Finally,an innovative heuristic method is introduced to simplify the parameterized facade.Through rigorous experimentation and evaluation,the effectiveness of the proposed parameterization methodology in capturing complex geometric details,semantic richness,and topological relationships of 3D building models is demonstrated.展开更多
In city planning managing, the third dimension is becoming a necessity. Using 3D GIS modeling offers a flexible interactive system while providing one of the best visual interpretation of data which supports planning ...In city planning managing, the third dimension is becoming a necessity. Using 3D GIS modeling offers a flexible interactive system while providing one of the best visual interpretation of data which supports planning and decision processes for city planners. As a result, 3D GIS model expresses terrain features in an intuitive way which enhances the management and analysis of a proposed project through 3D visualization. This paper discusses the concept of 3D GIS modeling techniques using a simple procedure to generate a university campus model （real 3D GIS model） which will show the effectiveness of this approach. The 3D GIS model provides access to mapping data to support planning, design and data management. Intelligent GIS models and GIS tools help community planning and apply regional and discipline-specific standards. Integration of GIS spatial data with campus organization helps to improve quality, productivity and asset management. The following study built 3D GIS map and all utility information for AI al-Bayt University campus as an example. The primary objective is to improve data management （e.g., maps, plans, usage of facilities and services） and to develop methods using 3D spatial analysis for specific applications at the university.展开更多
铁路站场调车防护系统作为各铁路局日常调车作业的信息化管理手段,目前已在铁路运输调度投入运用。应用不断深入后,基于二维GIS的调车防护系统在表现三维地理空间不够直观,给系统带来巨大挑战,并形成系统应用瓶颈。针对此现状,以三维地...铁路站场调车防护系统作为各铁路局日常调车作业的信息化管理手段,目前已在铁路运输调度投入运用。应用不断深入后,基于二维GIS的调车防护系统在表现三维地理空间不够直观,给系统带来巨大挑战,并形成系统应用瓶颈。针对此现状,以三维地理信息系统(3D GIS)和建筑信息模型(Building Information Modeling,BIM)技术为背景,研究基于系统整体性能的优化改进,并提出一种基于3D GIS+BIM的铁路站场调车防护系统设计方法。旨在运用三维GIS特性,提高系统整体性能。展开更多
文摘化学事故具有突发性强、环境污染破坏严重、救援难度大等特点,对突发化学事故的影响范围、破坏程度进行快速评估,为事故抢险救援提供决策支持,是应对重特大突发化学事故、降低事故损失的重要手段。本文基于三维地理信息系统(Three-dimensional Geographic Information System,3D GIS),在充分考虑下垫面影响的前提下,研究了大气污染扩散模型,提出了扩散场快速构建技术及兼顾污染分区的救援力量调度方法,并以此为核心建立了系统总体框架,形成了集扩散模拟、危害分析、救援调度等功能于一体的突发化学事故危害评估与救援辅助决策支持系统,可为突发化学事故危害后果评估与辅助救援决策提供有效的技术支撑。
文摘为了城市地下管线的可持续发展,要解决传统市政管线管理模式中存在的信息不透明、管理难度大等问题,以实现三维可视化、管线状态监测及视频监控、故障定位等目标。从系统总体架构和系统功能、数据库建设等方面出发,整合应用建筑信息模型(building information modeling,BIM)技术与三维地理信息系统(three-dimensional geographic information system,3D GIS)技术,提出智慧地下管线系统的建设方案。结合工程实例,应用智慧地下管线系统,分析与评价其应用效果。以期为未来地下管线的巡查、分析、决策提供数据支持,为相关工程提供借鉴。
基金Project 2001AA135170 supported by the National High-Tech Research and Development 863 Program of China
文摘Regional Geological Information System combines the multi-dimensional and dynamic spatial information into an integrated spatial information system. 3D geological modeling and its preprocessing or post-processing are the most difficult problems for constructing the system. Based on the current 3D GIS technique, some basic problems in establishing the system are discussed in this paper, including 3D spatial data model, 3D geological modeling, and visu- alization of 3D geological data. A kind of 3D vector data model based on boundary representation for geological object and its topology was developed in order to model and visualize complex geological structures. In addition, some key techniques are pointed out for further study.
基金National Natural Science of China(No.42201463)Guangxi Natural Science Foundation(No.2023GXNSFBA026350)+1 种基金Special Fund of Guangxi Science and Technology Base and Talent(Nos.Guike AD22035158,Guike AD23026167)Guangxi Young and Middle-aged Teachers’Basic Scientific Research Ability Improvement Project(No.2023KY0056).
文摘The relentless progress in the research of geographic spatial data models and their application scenarios is propelling an unprecedented rich Level of Detail(LoD)in realistic 3D representation and smart cities.This pursuit of rich details not only adds complexity to entity models but also poses significant computational challenges for model visualization and 3D GIS.This paper introduces a novel method for deriving multi-LOD models,which can enhance the efficiency of spatial computing in complex 3D building models.Firstly,we extract multiple facades from a 3D building model(LoD3)and convert them into individual semantic facade models.Through the utilization of the developed facade layout graph,each semantic facade model is then transformed into a parametric model.Furthermore,we explore the specification of geometric and semantic details in building facades and define three different LODs for facades,offering a unique expression.Finally,an innovative heuristic method is introduced to simplify the parameterized facade.Through rigorous experimentation and evaluation,the effectiveness of the proposed parameterization methodology in capturing complex geometric details,semantic richness,and topological relationships of 3D building models is demonstrated.
文摘In city planning managing, the third dimension is becoming a necessity. Using 3D GIS modeling offers a flexible interactive system while providing one of the best visual interpretation of data which supports planning and decision processes for city planners. As a result, 3D GIS model expresses terrain features in an intuitive way which enhances the management and analysis of a proposed project through 3D visualization. This paper discusses the concept of 3D GIS modeling techniques using a simple procedure to generate a university campus model （real 3D GIS model） which will show the effectiveness of this approach. The 3D GIS model provides access to mapping data to support planning, design and data management. Intelligent GIS models and GIS tools help community planning and apply regional and discipline-specific standards. Integration of GIS spatial data with campus organization helps to improve quality, productivity and asset management. The following study built 3D GIS map and all utility information for AI al-Bayt University campus as an example. The primary objective is to improve data management （e.g., maps, plans, usage of facilities and services） and to develop methods using 3D spatial analysis for specific applications at the university.
文摘铁路站场调车防护系统作为各铁路局日常调车作业的信息化管理手段,目前已在铁路运输调度投入运用。应用不断深入后,基于二维GIS的调车防护系统在表现三维地理空间不够直观,给系统带来巨大挑战,并形成系统应用瓶颈。针对此现状,以三维地理信息系统(3D GIS)和建筑信息模型(Building Information Modeling,BIM)技术为背景,研究基于系统整体性能的优化改进,并提出一种基于3D GIS+BIM的铁路站场调车防护系统设计方法。旨在运用三维GIS特性,提高系统整体性能。
