共查询到20条相似文献，搜索用时 31 毫秒
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GIS空间动态模型组件的设计与实现 总被引：1，自引：0，他引：1
组件重用技术为GIS与空间模型的集成提供了新的解决方案。该文设计的空间动态模型的GIS组件 -Dy namicGC ,它在传统GIS数据模型的基础上 ,增加了表达空间动态系统的过程和关系 (流 )的数据模型和对象接口 ,为GIS环境下创建复杂动态过程模型提供了新的工具和解决方案。该组件基于微软组件对象模型 (COM/DCOM)实现 ,充分考虑了互操作性、模型建模语言以及模型系统的可获取性需求 ,由一系列支持动态数据计算的OLE自动化对象集组成 ,可支持VB、Dephi、VisualC 等通用开发环境 ,也支持VBA、VBSCRIPT、JAVASCRIPT等脚本语言环境。使用VBA创建了经典的“生命游戏”的元胞自动机模型的实现 ,作为该组件创建动态过程模型的应用实例。 相似文献
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Bo Huang Bin Jiang Hui Li 《International journal of geographical information science》2013,27(5):439-456
This paper explores the way in which GIS, Virtual Reality (VR) and the Internet are closely integrated through the link of Virtual Reality Modelling Language (VRML) for spatial data visualization, analysis and exploration. Integration takes advantage of each component, and enables the dynamic 3D content to be built, visualized, interacted with and deployed all on the Web. To accomplish this, a hybrid approach that merges the conventional client-side and server-side methods is proposed, which offers the best of both worlds in terms of flexibility and capability, as well as the rational use of computing resources. Based on this approach, a Web-based prototype toolkit is designed and implemented by using an affordable desktop GIS through its macro language together with Java, Common Gateway Interface (CGI) and HTML programming. This toolkit comprises a 3D visualization tool, a 3D analysis tool, and a Java/VRML interface, which are respectively used for the creation of VRML models from 2D maps, surface analysis (e.g. profile creation and visibility analysis), and interaction (e.g. selecting and querying) with the output VRML worlds of 3D visualization and analysis. It is demonstrated that this toolkit provides an integrated environment, facilitating users to gain insights from the interaction with virtual environments that are built from existing GIS databases. 相似文献
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“面向区域”的GIS控件的设计与使用 总被引：4，自引：0，他引：4
本文提出了一个“面向区域”GIS控件的概念———即以特定的地理区域为对象,将基础地理信息连同有关的GIS功能操作融合为一个可重用的程序模块,以Microsoft的COM(即“组件对象模型”)技术为基础,组织为“GIS化”的ActiveX控件。这种GIS控件,将面向对象技术中的“对象”扩展到了整个特定的地理区域空间,其核心思想是不仅封装了GIS的数据模型,必要的功能操作,而且封装了所有的基础地理信息。由于省去了对空间数据的处理,因而这种GIS控件可被广大非GIS专业的信息系统开发者灵活、简便地用于各种管理信息系统、办公自动化系统和决策支持系统的GIS功能扩充,也可用于构建一般的地理信息系统,因而有利于GIS技术应用的普及。文章最后给出了有关陕西省的应用实例 相似文献
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关于虚拟地理环境研究的几点思考 总被引：10，自引：0，他引：10
该文主要回答了目前被频繁问及的有关虚拟地理环境的几个问题。重点阐述了虚拟地理环境的概念、发展现状及其基本理论、方法、关键技术与应用,以及与传统地理信息系统的区别。指出虚拟地理环境是在空间数据库和地理模型管理基础上构建的、同时表达地理静态和模拟动态现象的、面向多用户的分布式协同虚拟环境。因此,虚拟地理环境突破地理信息系统以数据共享为核心的框架,走向以数据库和模型库为双核心的知识共享平台,进而形成一个新知识的生成环境。 相似文献
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该文介绍了一个基于 3G集成的 12 0急救系统的设计 :信息流的分析 ,系统结构组成 ,以及构建 12 0急救系统的核心技术分析。并对与GIS、GPS技术联系紧密的三个重要部分进行分析 :1)系统构件关系设计 ;2 )数据收录处理 ;3)急救车路径规划。 相似文献
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GIS系统集成的理论与实践 总被引：61，自引：0，他引：61
本文探讨了ＧＩＳ系统集成的若干理论问题，集成系统的体系结构及系统集成的方法与步骤，并结合作者在“八五”攻关课题“洪水灾害遥感监测与评估技术研究”以及“重大自然灾害遥感监测评估集成系统研究”中的实践，介绍了集成的内容和若干工程性提出了运用对象连接与嵌入技术实现模型与ＧＩＳ动态集成的方法。 相似文献
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I.StduyAreaPUschRjdgeoftheSantaCatalinaMountains,CoronadONaionalForest,SoutheastArizona,wasselectedasastudyareafOrvegetationmopingandatestoftheroleOfGISinaidingrem0teIysenseddataclassificati0n.BeinganepitOmeoftheSantaCatalinaMountains,PUscllmdgeiscomprisedOf23O.65sqUarelQnoflandIocatedonthesouthwesternPOrti0noftheSantaCarelinaRangerDistrictOftheCoronadoNationalForest.ltprovidesasharPcontrastbebeenthenamralruggdnessOftheSantaCatalinaMountainsandtheCityOfTucson,Arizona,araPdl… 相似文献
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基于模块的分布式水文模拟系统及其应用 总被引：3，自引：2，他引：1
由于水文循环过程的复杂性和空间变异性,集成不同的水循环模型,基于模块化结构、构建面向多目标的水文模拟系统已经成为当今水文模拟技术发展的一个重要方向。本文从科学研究和水资源管理的实际需要,首次研发国内基于模块化的分布式水文模拟系统,并提出了“信息化水文模拟系统(HydroInformatic Modeling System, 简称HIMS)”。HIMS是一个以水循环信息平台为基础,基于组件式结构设计的开放式综合水循环模拟系统,侧重于分布式水文过程的模拟与应用。文中对HIMS的设计思路,主要功能与结构进行了详细介绍,包括基于国产GIS软件SuperMap的水循环信息系统、模型数据前/后处理系统和水文模型方法库系统。其中,HIMS的水文模型方法库系统集成了水文过程方法库和多种水文模型,并提供定制水文模型的功能。HIMS的提出发展了水文模型理论和建模技术,拓宽了国内分布式水文模型的研究思路。 相似文献
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论“数字城市”及其三维再现关键技术 总被引：31，自引：6，他引：31
“数字城市”是以计算机技术、多媒体技术和大规模存储技术为基础 ,以宽带网络为纽带 ,运用 3S技术、遥测、仿真—虚拟技术等对城市进行多分辨率、多尺度、多时空和多种类的三维描述。通过“数字城市”技术可以将现代城市的信息收集、整理、归纳起来 ,并按照地理坐标建立完整的空间数据模型 ,经过网络联结使每个人都能快速、完整、形象地了解城市的过去、现状和未来。目前国内外“数字城市”研究基本上是停留在软硬环境建设方面 ,至多处于研究的初期阶段 ,并没有在“数字城市”研究方面取得实质性的进展。本文主要探讨我国实现“数字城市”的关键技术 ,诸如 :数字城市空间基础设施、多种GIS系统集成模型研究、 3D GIS、三维城市规划、城市仿真与虚拟现实技术、数字城市支持下的数字社区等等。 相似文献
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基于神经网络的元胞自动机及模拟复杂土地利用系统 总被引：57，自引：9，他引：57
本文提出了基于神经网络的元胞自动机(CellularAutomata),并将其用来模拟复杂的土地利用系统及其演变。国际上已经有许多利用元胞自动机进行城市模拟的研究,但这些模型往往局限于模拟从非城市用地到城市用地的转变。模拟多种土地利用的动态系统比一般模拟城市演化要复杂得多,需要使用许多空间变量和参数,而确定模型的参数值和模型结构有很大困难。本文通过神经网络、元胞自动机和GIS相结合来进行土地利用的动态模拟,并利用多时相的遥感分类图像来训练神经网络,能十分方便地确定模型参数和模型结构,消除常规模拟方法所带来的弊端。 相似文献
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Jonathan L. Goodall David R. Maidment 《International journal of geographical information science》2013,27(2):233-247
Despite a long history of synergy, current techniques for integrating Geographic Information System (GIS) software with hydrologic simulation models do not fully utilize the potential of GIS for modeling hydrologic systems. Part of the reason for this is a lack of GIS data models appropriate for representing fluid flow in space and time. Here we address this challenge by proposing a spatiotemporal data model designed specifically for large‐scale river basin systems. The data model builds from core concepts in geographic information science and extends these concepts to accommodate mathematical representations of fluid flow at a regional scale. Space–time is abstracted into three basic objects relevant to hydrologic systems: a control volume, a flux and a flux coupler. A control volume is capable of storing mass, energy or momentum through time, a flux represents the movement of these quantities within space–time and a flux coupler insures conservation of the quantities within an overall system. To demonstrate the data model, a simple case study is presented to show how the data model could be applied to digitally represent a river basin system. 相似文献
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CRAIG M. TROTTER 《International journal of geographical information science》2013,27(2):225-239
Abstract Remotely-sensed image data have long served as a primary source of information for. geographical information systems (GIS), with the transformation of data to information provided by visual image interpretation. Digital image data, in combination with recent advances in computer technology, currently allow visual image interpretation to be realised in a completely digital processing environment. However, it remains desirable to capitalize even further on the potential of digital image data for GIS, through the use of schemes involving automated data processing. The opportunities for, and impediments to, such schemes are considered here with particular reference to the provision of information for natural resource management. It is concluded that further—although foreseeable—developments in both research and technology will be required before fully operational procedures for the automated acquisition of GIS information from image data can be established. 相似文献
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Geospatial data and tools are key in locating lost or missing persons in as short a time as possible. In this study, we used a geographic information system (GIS) to analyze four years of search and rescue (SAR) mission data from Colorado to determine the appropriate use of GIS for volunteer-based SAR organizations with limited resources and GIS expertise. GIS can provide more sophisticated analyses of geospatial data than simple mapping technologies, but our findings indicated that complex spatial analysis might not be required on all missions, because the majority of missions were completed within six to ten hours. Instead, new technologies such as tablets with mapping software and online GIS systems that provide quick and easy access to up-to-date geospatial data such as imagery offer capabilities that could improve mission planning. Here we provide a framework in which SAR missions can apply geospatial technologies to aid with missions, identify critical “hotspots,” and enhance postanalysis and training. The work here is highly applicable for nonprofit SAR groups when deciding on what GIS technologies to consider for their areas. 相似文献
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地理信息系统发展趋势 总被引：10，自引：0，他引：10
本文根据国内外在地理信息系统方面的进展，就地理信息系统的科学概念、基本构成和它的以下一些发展趋势作了讨论：（1）地理信息系统是构成地理学日臻完善的技术体系的重要部分；（2）空间分析功能是系统研究和应用的主要目标；（3）系统最重要的技术问题是管理和存储大量空间数据的数据结构；（4）综合性的发展特色日益明显；（5）标准化和智能型的发展方向已引起关注。 相似文献
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Abstract The field of geographical information systems (GIS) is reviewed from the viewpoint of spatial analysis which is the key component of the familiar four-part model of input, storage, analysis and output Input is constrained by the limits of manual methods and problems of ambiguity in scanning. The potential for developments in output is seen to be limited to the query mode of GIS operation, and to depend on abandoning the cartographic model. Discussion of storage methods is organized around the raster versus vector debate and the need to represent two spatial dimensions in one. A taxonomy of GIS spatial analysis operations is presented together with a generic data model. Prospects for implementation are discussed and seen to depend on appropriate scales of organization in national and international academic research. 相似文献
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D. J. ABEL S. K. YAP R. ACKLAND M. A. CAMERON D. F. SMITH G. WALKER 《International journal of geographical information science》2013,27(3):193-204
Abstract Recent changes in information technology offer the opportunity to explore alternative architectures for geographical information systems (GIS) which might better support advanced applications. This paper describes the architecture and implementation of the environmental decision support system (EDSS), a prototype GIS tool kit. The architecture is based on a simple yet powerful systems model using only data collections, views and operations as the basic entity types. The design of the user interface, data management and data analysis within the model are outlined, with particular emphasis on the advanced facilities for which implementation is simplified by the architecture. A prototype applications system, BANKSIA, is also described. 相似文献