共查询到20条相似文献，搜索用时 31 毫秒
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HOWARD TURNER 《International journal of geographical information science》2013,27(4):295-306
Abstract Databases used in geographical information systems must be supplied with current data. Maps are usually out of date when they are published. Satellite imagery and aerial photographs supply up-to-date three-dimensional data. Three different models for real-time quality assurance control in three-dimensional data collection for geographical information systems are discussed. Emphasis is placed on the visual detection of ‘blunders’ in three-dimensional data. One data collection quality assurance model has been implemented in the Photogrammetric Analysis Laboratory at Purdue University. An example from this system is given and the precision and speed of digitization of three-dimensional data are discussed. 相似文献
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MICHAEL F. GOODCHILD SUN GUOQING YANG SHIREN 《International journal of geographical information science》2013,27(2):87-103
Abstract An error model for spatial databases is defined here as a stochastic process capable of generating a population of distorted versions of the same pattern of geographical variation. The differences between members of the population represent the uncertainties present in raw or interpreted data, or introduced during processing. Defined in this way, an error model can provide estimates of the uncertainty associated with the products of processing in geographical information systems. A new error model is defined in this paper for categorical data. Its application to soil and land cover maps is discussed in two examples: the measurement of area and the measurement of overlay. Specific details of implementation and use are reviewed. The model provides a powerful basis for visualizing error in area class maps, and for measuring the effects of its propagation through processes of geographical information systems. 相似文献
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区域喀斯特石漠化信息系统的设计研究 总被引：2，自引：0，他引：2
本系统采用ArcGIS 软件作为基本平台, 以广西都安县为例, 借助其中的空间叠加分析与 地理统计分析方法, 构建了基于ArcObjects 的专业型GIS———区域喀斯特石漠化信息系统 (RKRDIS)。该系统是以喀斯特石漠化专业分析模型为核心, 以空间数据为信息材料, 以计算机网 络为传输载体, 解决喀斯特石漠化研究数据分析、查询、显示和管理等信息处理技术, 实现从“数 据”提取“信息”, 提供喀斯特石漠化的空间数据分析、动态监测、驱动诊断、预警分析、灾害评估和 辅助决策等多方面支持。 相似文献
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JOHN HASLETT GRAHAM WILLS ANTONY UNWIN 《International journal of geographical information science》2013,27(3):285-296
Interactive statistical graphics are reviewed in the contexts of spatial data and geographical information systems (GIS). GIS provide the user with an active geographical view of the data—a map that can be used as an entry point to the data base. Prototype software—SPIDER—illustrates the possibilities of using statistical graphics as further views of the data, which can be made active and thus provide alternative means of querying the data. These views can be cross-referenced by 'linking'. It is argued that such a system can provide a very rich environment for pursuing exploratory statistical analysis of spatial data. 相似文献
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Javier Lacasta F. Javier Lopez-Pellicer Borja Espejo-García Javier Nogueras-Iso F. Javier Zarazaga-Soria 《International journal of geographical information science》2017,31(8):1583-1605
Geospatial data catalogs enable users to discover and access geographical information. Prevailing solutions are document oriented and fragment the spatial continuum of the geospatial data into independent and disconnected resources described through metadata. Due to this, the complete answer for a query may be scattered across multiple resources, making its discovery and access more difficult. This paper proposes an improved information retrieval process for geospatial data catalogs that aggregates the search results by identifying the implicit spatial/thematic relations between the metadata records of the resources. These aggregations are constructed in such a way that they match better the user query than each resource individually. 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
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DAVID RHIND 《International journal of geographical information science》2013,27(3):229-241
Abstract This paper summarizes the numerous developments in geographical information systems (GIS) in the United Kingdom over the past few years, covering the development of systems, the creation of data bases, the elucidation of user needs, the education and training of staff and the role adopted by government. The review is organized by the different sectors now actively involved in GIS. 相似文献
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论地理信息系统及其在地理学中的地位 总被引：44，自引：0，他引：44
地理信息系统技术的兴起代表了地理学发展的一个重要方向。地理信息系统是一门处理地理(空间)数据的综合信息技术,它属于技术地理学的范畴,它为资源与环境的管理和规划以及地理学的研究提供了一个革命性工具。另一方面,地理信息系统的建立和应用又依赖于地理学理论和实用模型的发展。进一步勾通地理信息系统与空间分析之间的关系是目前促进地理信息系统发展的重要课题。 相似文献
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HARVEY J. MILLER 《International journal of geographical information science》2013,27(3):287-301
Abstract The space-time Of time geographical framework is a powerful perspective from which to analyse human behaviour. One of the central concepts in this framework is the space-time prism, which models individual accessibility to an environment. In this paper, the derivation and manipulation of space-time prism concepts within a geographical information system (GIS) are discussed. The required system inputs and desired outputs are identified and a generic GIS based procedure is presented Given these basic requirements, issues are discussed which can determine the feasibility of current GIS technology to handle the derivation of space-time prism concepts. 相似文献
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WIM G. M. VAN DER KNAAP 《International journal of geographical information science》2013,27(2):159-170
Abstract Many geographical information systems offer the possibility of converting vector data to raster data and using the raster pattern for analysis. This conversion process is already well known and has been used for many years. This paper shows how a selection of eight geographical information systems convert vector test data to a raster pattern. Each system handles this process in its own way, giving results that differ both in number and in the location of assigned raster cells in the raster pattern. The results of the conversions are compared with a desired raster pattern based on five simple principles. Suggestions are made about standardizing the process of conversion for all geographical information systems to make it possible to create and exchange data more safely. 相似文献
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Raphael Sussman 《International journal of geographical information science》2013,27(4):367-377
Abstract The City of Scarborough, like many corporations, recently re-evaluated its information technology requirements. The decision was made to model the City's needs in terms of activities and data requirements, concentrating on the Municipal Data Model. First, a two year study was undertaken to understand the business activities of all the disparate components that make up the corporation. This study resulted in individual Information Resource Plans (IRP) for each department. A third year was spent in reconciling the many separate documents and creating a high-level Conceptual Data Model for a Corporate Information System. Of the thirteen broad data groupings, four were assigned to the GIS Group for the design of Detailed Data Models and to populate the resultant databases. The GIS Group, in fact, were to initiate the new Information System for the entire City. The modelling sessions involved hundreds of users from the entire user community in small and large groups, in intensive entity-definition activities, in technical review sessions and in the general examination of context. The detailed models were validated by involving still more users and by testing the model in prototypes, special projects and joint ventures. The GIS Project has demonstrated that data modelling is an effective and realistic method of reflecting the municipality as an enterprise. 相似文献
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TERRY COPPOCK ERIC ANDERSON 《International journal of geographical information science》2013,27(1):3-11
Abstract This paper comprises the thoughts and perceptions of an interested outsider, an accountant and economist by training, who has recently chaired a Committee of Enquiry into the handling of geographical information. It focuses on the real barriers to getting more practical use from geographical information systems (GIS), most of which have research implications—but not of a technical nature. To an outsider GIS appears as a solution, or more strictly a tool, in search of a problem. Of course, there are numerous problems for GIS to tackle, but the difficulty is that those who have the problems are often either unaware of GIS and the questions they can deal with or, more seriously, are unaware that they have problems and of the questions they should be asking. GIS as a tool is about aiding managers to carry out their jobs more efficiently and effectively, and, more particularly, about better decision-making 相似文献
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JAY LEE 《International journal of geographical information science》2013,27(3):267-285
Abstract Triangulated irregular networks (TINs) are increasingly popular for their efficiency in data storage and their ability to accommodate irregularly spaced elevation points for many applications of geographical information systems. This paper reviews and evaluates various methods for extracting TINs from dense digital elevation models (DEMs) on a sample DEM. Both structural and statistical comparisons show that the methods perform with different rates of success in different settings. Users of DEM to TIN conversion methods should be aware of the strengths and weaknesses of the methods in addition to their own purposes before conducting the conversion. 相似文献
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Howard Veregin 《International journal of geographical information science》2013,27(6):595-619
Abstract This study examines the propagation of thematic error through GIS overlay operations. Existing error propagation models for these operations are shown to yield results that are inconsistent with actual levels of propagation error. An alternate model is described that yields more consistent results. This model is based on the frequency of errors of omission and commission in input data. Model output can be used to compute a variety of error indices for data derived from different overlay operations. 相似文献
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Abstract The accumulation of geological information in digital form, due to modern exploration methods, has introduced the possibility of applying geographical information system technology to the field of geology. To achieve the benefits in information management and in data analysis and interpretation, however, it will be necessary to develop spatial models and associated data structures which are specifically designed for working in three dimensions. Some progress in this direction has already been demonstrated, with the application of octree spatial subdivision techniques to the storage of uniform volume elements representing mineral properties. By imposing octree tessellations on more precisely-defined geometric data, such as triangulated surfaces and polygon line segments, it may now be possible to combine efficient spatial addressing with topologically-coded boundary representations of geological strata. The development of storage schemes capable of representing such geological boundary models at different scales poses a particular problem, a possible solution to which may be by means of hierarchical classification of the vertices of triangulated surfaces according to shape contribution. 相似文献