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Use of LDAP partially implement the OGIS discovery service / S. Ramroop in International journal of geographical information science IJGIS, vol 15 n° 5 (july 2001)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 15 n° 5 (july 2001) . - pp 391 - 413 Titre : Use of LDAP partially implement the OGIS discovery service Type de document : Article/Communication Auteurs : S. Ramroop, Auteur ; R. Pascoe, Auteur Année de publication : 2001 Article en page(s) : pp 391 - 413 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] données localisées numériques [Termes IGN] information sémantique [Termes IGN] métadonnées géographiques [Termes IGN] protocole [Termes IGN] requête spatiale [Termes IGN] système d'information géographique Résumé : (Auteur) The geographical information systems (GIS) community has over the years captured and generated large amounts of geographical data. Discovery of these heterogeneous data sets is our main concern. Research described in this paper is focussed on one component of a Georesource Centre, an infrastructure facilitating the sharing of geographical data and processes among organisations. The role of this component, the Selector Broker, is to process metadata queries in the search for appropriate data sets. Processing of queries within the Selector Broker involves translation of the metadata semantics and query syntax. There are several ways such a translation can be done and we have adopted the direct translation of semantics and syntax in this paper. In direct translation, semantic and syntactic differences are mapped directly between systems without going through an intermediate system. In the design of the Centre, organisations use the Lightweight Directory Access Protocol (LDAP) to store entries of geographical data sets they have collected. The Selector Broker processes these entries using pre-defined semantic and syntactic mappings to translate the initial queries. The service provided by the Selector Broker is accessed through the Common Request Broker Architecture (CORBA). Numéro de notice : A2001-111 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810110047230 En ligne : https://doi.org/10.1080/13658810110047230 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21811 [article]

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Uncertainty and sensitivity analysis: tools for GIS-based model implementation / M. Crosetto in International journal of geographical information science IJGIS, vol 15 n° 5 (july 2001)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 15 n° 5 (july 2001) . - pp 415 - 437 Titre : Uncertainty and sensitivity analysis: tools for GIS-based model implementation Type de document : Article/Communication Auteurs : M. Crosetto, Auteur ; S. Tarantola, Auteur Année de publication : 2001 Article en page(s) : pp 415 - 437 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] analyse coût-avantage [Termes IGN] analyse de sensibilité [Termes IGN] hydrologie [Termes IGN] implémentation (informatique) [Termes IGN] incertitude des données [Termes IGN] modélisation spatiale Résumé : (Auteur) A novel procedure to analyse the uncertainty associated to the output of GIS-based models is presented. The procedure can handle models of any degree of complexity that accept any kind of input data. Two important aspects of spatial modelling are addressed: the propagation of uncertainty from model inputs and model parameters up to the model output (uncertainty analysis) ; and the assessment of the relative importance of the sources of uncertainty in the output uncertainty (sensitivity analysis). Two main applications are proposed. The procedure allows implementation of a GIS-based model whose output can reliably support the decision process with an optimised allocation of resources for spatial data acquisition. This is possible in low cost strategy, based on numerical simulations on a small prototype of the GIS-based model. Furthermore, the procedure provides an effective model building tool to choose, from a group of alternative models, the best one in terms of cost-benefit analysis. A comprehensive case study is described. It concerns the implementation of a new GIS-based hydrologic model, whose goal is providing near real-time flood forecasting. Numéro de notice : A2001-112 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810110053125 En ligne : https://doi.org/10.1080/13658810110053125 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21812 [article]

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An integration of GIS, virtual reality and the Internet for visualization, analysis and exploration of spatial data / B. Huang in International journal of geographical information science IJGIS, vol 15 n° 5 (july 2001)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 15 n° 5 (july 2001) . - pp 439 - 456 Titre : An integration of GIS, virtual reality and the Internet for visualization, analysis and exploration of spatial data Type de document : Article/Communication Auteurs : B. Huang, Auteur ; Bin Jiang, Auteur ; H. Li, Auteur Année de publication : 2001 Article en page(s) : pp 439 - 456 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] analyse spatiale [Termes IGN] données localisées 3D [Termes IGN] données localisées numériques [Termes IGN] géovisualisation [Termes IGN] HTML [Termes IGN] Java (langage de programmation) [Termes IGN] langage de modélisation [Termes IGN] réalité virtuelle [Termes IGN] script CGI [Termes IGN] système d'information géographique [Termes IGN] toile d'araignée mondiale [Termes IGN] visualisation 3D [Termes IGN] VRML Résumé : (Auteur) 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 visualisation, analysis and exploration. Integration takes advantage of each component, and enables the dynamic 3D content to be built, visualised, 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 visualisation 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 visualisation 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. Numéro de notice : A2001-113 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810110046574 En ligne : https://doi.org/10.1080/13658810110046574 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21813 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
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Assessing fitness for use: the expected value of spatial data sets / S. De Bruin in International journal of geographical information science IJGIS, vol 15 n° 5 (july 2001)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 15 n° 5 (july 2001) . - pp 457 - 471 Titre : Assessing fitness for use: the expected value of spatial data sets Type de document : Article/Communication Auteurs : S. De Bruin, Auteur ; Arnold K. Bregt, Auteur Année de publication : 2001 Article en page(s) : pp 457 - 471 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] incertitude des données [Termes IGN] jeu de données localisées [Termes IGN] modèle numérique de surface Résumé : (Auteur) This paper proposes and illustrates a decision analytical approach to compare the value of alternative spatial data sets. In contrast to other work addressing value of information, its focus is on value of control. This is a useful concept when choosing the best data set for decision making under uncertainty due to error in the reported data. Application of the concept requires probabilistic accuracy measures and a loss function representing the cost of incorrect judgement about some target property. This is illustrated by an assessment of the suitability of two digital elevation models (DEMs) for determining the volume of sand required for building a container port. To demonstrate flexibility of the approach, accuracy assessment was based on both a random and a systematic sample of error data, using designbased estimation and model-based prediction, that is geostatistics. Analysis results included the expected loss for each combination of DEM and sampling strategy. These indicated that both DEMs were equally suitable for the intended use. Operational practicability of the method is highly dependent on the willingness of database producers to give access to sample information similar to the quick looks provided to potential users of remote sensing imagery. Numéro de notice : A2001-114 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810110053116 En ligne : https://doi.org/10.1080/13658810110053116 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21814 [article]

Exemplaires(1)

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On the accuracy of TIGER-type geocoded address data in relation to cadastral and census areal units / J.H. Ratcliffe in International journal of geographical information science IJGIS, vol 15 n° 5 (july 2001)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 15 n° 5 (july 2001) . - pp 473 - 485 Titre : On the accuracy of TIGER-type geocoded address data in relation to cadastral and census areal units Type de document : Article/Communication Auteurs : J.H. Ratcliffe, Auteur Année de publication : 2001 Article en page(s) : pp 473 - 485 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] adresse postale [Termes IGN] cadastre étranger [Termes IGN] géocodage [Termes IGN] précision des données [Termes IGN] recensement démographique [Termes IGN] système d'information géographique Résumé : (Auteur) In many applications of Geographical Information Systems (GIS) a common task is the conversion of addresses into grid coordinates. In many countries this is usually accomplished using address range TIGER-type files in conjunction with geocoding packages within a GIS. Improvements in GIS functionality and the storage capacity of large databases mean that the spatial investigation of data at the individual address level is now commonly performed. This process relies on the accuracy of the geocoding mechanism and this paper examines this accuracy in relation to cadastral records and census tracts. Results from a study of over 20000 addresses in Sydney, Australia, using a TIGER-type geocoding process suggest that 5-7.5% (depending on geocoding method) of addresses may be misallocated to census tracts, and more than 50% may be given coordinates within the land parcel of a different property. Numéro de notice : A2001-115 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810110047221 En ligne : https://doi.org/10.1080/13658810110047221 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21815 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-01051	RAB	Revue	Centre de documentation	En réserve L003	Disponible