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[n° ou bulletin]
est un bulletin de Cartography and Geographic Information Science / Cartography and geographic information society (1999 -) ![]()
[n° ou bulletin]
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Exemplaires(1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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032-01041 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
Dépouillements
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On the uncertainty of local shape of lines and surfaces / B. Schneider in Cartography and Geographic Information Science, vol 28 n° 4 (October 2001)
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[article]
Titre : On the uncertainty of local shape of lines and surfaces Type de document : Article/Communication Auteurs : B. Schneider, Auteur Année de publication : 2001 Article en page(s) : pp 237 - 247 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] discrétisation spatiale
[Termes IGN] échelle cartographique
[Termes IGN] interpolation spatiale
[Termes IGN] modélisation spatiale
[Termes IGN] précision de localisationRésumé : (Auteur) Modeling line or surface phenomena digitally involves two tasks : discretization of the phenomenon, which yields a finite set of data, and subsequent interpolation, which reconstructs the continuum. Many mathematical techniques exist for the latter task, and most methods require a number of parameters to be specified. The shape of digital line or surface models between the data points (that is, the local shape) and the information derived from these models both depend on the selected method and, possibly, on the specification of parameters. The reconstruction of the continuum thus introduces uncertainty. This paper examines the sources and effects of this type of uncertainty. For this purpose, the modeling of lines and surfaces is separated into an abstraction, an implementation, and measurement. The individual factors affecting uncertainty of local shape in each step are identified and discussed. The paper concludes that local shape uncertainty, unlike positional uncertainty of given data, cannot be numerically assessed. Instead, measures of plausibility have to be used to denote the quality of digital models of lines and surfaces. Finally, the concept and potential problems of future empirical investigations are discussed. Numéro de notice : A2001-161 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1559/152304001782152991 En ligne : https://doi.org/10.1559/152304001782152991 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21856
in Cartography and Geographic Information Science > vol 28 n° 4 (October 2001) . - pp 237 - 247[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-01041 RAB Revue Centre de documentation En réserve L003 Disponible Developing Web-based mapping applications through distributed object technology / X. Zhu in Cartography and Geographic Information Science, vol 28 n° 4 (October 2001)
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Titre : Developing Web-based mapping applications through distributed object technology Type de document : Article/Communication Auteurs : X. Zhu, Auteur Année de publication : 2001 Article en page(s) : pp 249 - 258 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] base de données répartie
[Termes IGN] carte interactive
[Termes IGN] cartographie par internet
[Termes IGN] CORBA
[Termes IGN] toile d'araignée mondialeRésumé : (Auteur) Emerging webbased mapping technologies use the World Wide Web (WWW) and Internet protocols to provide the ability to distribute, access, and visualize geospatial information over the Internet. Many webbased mapping applications have been developed to deliver geospatial information within and across organizations and even to the public at large. A major technological challenge is to achieve interoperability amongst webbased mapping applications so that mapping and geoprocessing resources distributed over the Internet can be shared and integrated. This paper presents an approach to the development of webbased mapping applications using distributed object technology in order to enable interoperability. Distributed object technology combines object technology, which utilizes reusable software components (called objects) that model realworld entities to build software systems, and distributed computing, which allows computing resources to be distributed and accessed over computer networks. The paper introduces a distributed object technology, the Common Object Request Broker Architecture (CORBA); proposes an architecture for webbased mapping using CORBA ; and presents a prototype implementation. Numéro de notice : A2001-162 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304001782152973 En ligne : https://doi.org/10.1559/152304001782152973 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21857
in Cartography and Geographic Information Science > vol 28 n° 4 (October 2001) . - pp 249 - 258[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-01041 RAB Revue Centre de documentation En réserve L003 Disponible Extracting high points from statistical surfaces: a case study using digital elevation model / E.A. Wentz in Cartography and Geographic Information Science, vol 28 n° 4 (October 2001)
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[article]
Titre : Extracting high points from statistical surfaces: a case study using digital elevation model Type de document : Article/Communication Auteurs : E.A. Wentz, Auteur ; M. Kuby, Auteur ; B. Vogt, Auteur Année de publication : 2001 Article en page(s) : pp 259 - 271 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] Arizona (Etats-Unis)
[Termes IGN] extraction automatique
[Termes IGN] modèle numérique de surface
[Termes IGN] sommet (relief)
[Termes IGN] surface (géométrie)Résumé : (Auteur) We introduce and test an algorithm for extracting highpoint locations from statistical surface data. The algorithm uses map algebra and local neighbourhood analysis via three key parameters: minimum vertical gain, vertical gain neighbourhood, and horizontal separation neighbourhood. Though the method is applicable to any x,y,z data set, we tested it on 1:250,000 digital elevation models (DEMs) for Arizona. The resulting high points were compared quantitatively with an independent data set of named summits from the USGS Geographic Names Information System (GNIS). The comparison showed that, on an aggregate basis, the extraction method can approximate the number and spatial pattern of high points when compared to the GN IS points. However, extraction by neighbourhood analysis may consistently misdiagnose certain features, such as the edges of troughs (e.g., canyon rims). Numéro de notice : A2001-163 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1559/152304001782152964 En ligne : https://doi.org/10.1559/152304001782152964 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21858
in Cartography and Geographic Information Science > vol 28 n° 4 (October 2001) . - pp 259 - 271[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 032-01041 RAB Revue Centre de documentation En réserve L003 Disponible