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
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
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
In the face of complicated, diversified three-dimensional world, the existing 3D GIS data models suffer from certain issues such as data incompatibility, insufficiency in data representation and representation types, ...In the face of complicated, diversified three-dimensional world, the existing 3D GIS data models suffer from certain issues such as data incompatibility, insufficiency in data representation and representation types, among others. It is often hard to meet the requirements of multiple application purposes(users) related to GIS spatial data management and data query and analysis, especially in the case of massive spatial objects. In this study, according to the habits of human thinking and recognition, discrete expressions(such as discrete curved surface(DCS), and discrete body(DB)) were integrated and two novel representation types(including function structure and mapping structure) were put forward. A flexible and extensible ubiquitous knowledgeable data representation model(UKRM) was then constructed, in which structurally heterogeneous multiple expressions(including boundary representation(B-rep), constructive solid geometry(CSG), functional/parameter representation, etc.) were normalized. GIS's ability in representing the massive, complicated and diversified 3D world was thus greatly enhanced. In addition, data reuse was realized, and the bridge linking static GIS to dynamic GIS was built up. Primary experimental results illustrated that UKRM was overwhelmingly superior to the current data models(e.g. IFC, City GML) in describing both regular and irregular spatial objects.展开更多
To improve the reusability of three-dimensional （3D） models and simplify the complexity of natural scene reconstruction, this paper presents a 3D model database for universal 3D GIS. After the introduction of its ex...To improve the reusability of three-dimensional （3D） models and simplify the complexity of natural scene reconstruction, this paper presents a 3D model database for universal 3D GIS. After the introduction of its extensible function architecture, accompanied by the conclusion of implicit spatial-temporal hierarchy of models in any reconstructed scene of 3D GIS for general purpose, several key issues are discussed in detail, such as the storage and management of 3D models and related retrieval and load method, as well as the interfaces for further on-demand development. Finally, the validity and feasibility of this model database are proved through its application in the development of 3D visualization system of railway operation.展开更多
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.
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。
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。
基金supported by the National Natural Science Foundation of China(Grant No.41271196)the Key Project of the 12th Five-year Plan,Chinese Academy of Sciences(Grant No.KZZD-EW-07-02-003)
文摘In the face of complicated, diversified three-dimensional world, the existing 3D GIS data models suffer from certain issues such as data incompatibility, insufficiency in data representation and representation types, among others. It is often hard to meet the requirements of multiple application purposes(users) related to GIS spatial data management and data query and analysis, especially in the case of massive spatial objects. In this study, according to the habits of human thinking and recognition, discrete expressions(such as discrete curved surface(DCS), and discrete body(DB)) were integrated and two novel representation types(including function structure and mapping structure) were put forward. A flexible and extensible ubiquitous knowledgeable data representation model(UKRM) was then constructed, in which structurally heterogeneous multiple expressions(including boundary representation(B-rep), constructive solid geometry(CSG), functional/parameter representation, etc.) were normalized. GIS's ability in representing the massive, complicated and diversified 3D world was thus greatly enhanced. In addition, data reuse was realized, and the bridge linking static GIS to dynamic GIS was built up. Primary experimental results illustrated that UKRM was overwhelmingly superior to the current data models(e.g. IFC, City GML) in describing both regular and irregular spatial objects.
基金Supported by the National Natural Science Foundation of China (No.40871212, No.40671158)the National High Technology Research and Development Program of China (No.2008AA121600)
文摘To improve the reusability of three-dimensional （3D） models and simplify the complexity of natural scene reconstruction, this paper presents a 3D model database for universal 3D GIS. After the introduction of its extensible function architecture, accompanied by the conclusion of implicit spatial-temporal hierarchy of models in any reconstructed scene of 3D GIS for general purpose, several key issues are discussed in detail, such as the storage and management of 3D models and related retrieval and load method, as well as the interfaces for further on-demand development. Finally, the validity and feasibility of this model database are proved through its application in the development of 3D visualization system of railway operation.
