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ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings
nom du congrès :
ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century
début du congrès :
06/08/2001
fin du congrès :
10/08/2001
ville du congrès :
Pékin
pays du congrès :
Chine
site des actes du congrès :
|
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Spatial object aggregation based on data structure, local triangulation and hierarchical analyzing method / Liu Yaolin (2001)
contenu dans Mapping the 21st century: the 20th International Cartographic Conference, ICC 2001, Beijing, China, August 6 - 10, 2001, vol 3. Proceedings / L. Li (2001)
Titre : Spatial object aggregation based on data structure, local triangulation and hierarchical analyzing method Type de document : Article/Communication Auteurs : Liu Yaolin, Auteur ; Martien Molenaar, Auteur ; Menno-Jan Kraak, Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2001 Conférence : ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings Importance : pp 1625 - 1640 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] agrégation de données
[Termes IGN] approche hiérarchique
[Termes IGN] classification ascendante hiérarchique
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] information sémantique
[Termes IGN] modèle conceptuel de données
[Termes IGN] objet géographique
[Termes IGN] structure de données localisées
[Termes IGN] triangulation de DelaunayRésumé : (Auteur) Aggregation for spatial objects plays an important role in database or model generalization in GI since reducing spatial complexity is one of the major aims of model generalization. The aggregation operation can be considered as a geometrical operation under the control of semantic and spatial relation of objects. The process of spatial object aggregation is the process of spatial, semantic analyzing, decision-making and the implementation of operation. This process needs not only the geometric and thematic attributes of the objects, but also the spatial and semantic relationship among the objects. It also needs the supporting data structure and analyzing tools in order to make analyzing, decision-making and computation easy in aggregation process. There is still lack of studies on how data structure supports aggregation process and also lack of the method for semantic analysis in aggregation process. This paper is to focus methods and process of spatial aggregation based on semantic and geometric characteristics of spatial objects and relations among the object with the help of spatial data structure (Formal Data Structure), local constrained Delaunay triangulations and semantic hierarchy. The adjacent relation among connected objects an unconnected objects has been studied through constrained triangle as elementary processing unit aggregation operation. The hierarchical semantic analytical matrix is given for analyzing the similarity between object types and between objects (including different levels). It will govern and guide aggregation process. The several different cases of aggregation have been presented in this paper. Numéro de notice : C2001-041 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f11058.pd [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64949
contenu dans Mapping the 21st century: the 20th International Cartographic Conference, ICC 2001, Beijing, China, August 6 - 10, 2001, vol 5. Proceedings / L. Li (2001)
Titre : Status of data quality in European national mapping agencies Type de document : Article/Communication Auteurs : Antti Jakobsson, Auteur ; François Vauglin , Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2001 Conférence : ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings Importance : pp 2875 - 2883 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] Europe (géographie politique)
[Termes IGN] information géographique
[Termes IGN] organisme cartographique national
[Termes IGN] qualitéRésumé : (Auteur) EuroGeographics (formerly CERCO) brings together representatives from the European National Mapping Agencies (NMAs). Its mission is to represent Europe's NMAs and coordinate their efforts to develop the European Geographic Information Infrastructure. It has created several working groups for exchanging information and discussing issues relating to geographical information including the Working Group on Quality. This group is considering three subjects : 'Quality management' and 'ISO 9000', 'Data quality issues and Standards'. The Sub-WorkingGroup on Data Quality (SWG) aims to share experiences in methods used to write dataset specifications, measure quality, assess user requirements and evaluate fitness for use.
The SWG used product life cycle as a basis for further study of other issues relating data quality and to prepare a questionnaire based on diffèrent steps in the product life cycle.
The questionnaire on data quality was prepared in 1999 and received answers from 18 countries, including the USA. This paper is based on the results of the questionnaire.
The questionnaire covered a total of 226 datasets. All NMAs produce topographic datasets and about half also produce cadastral datasets. The questionnaire also covered other datasets produced by the NMAs. The reasons for producing the datasets was divided between legal obligations and market reasons. The user requirements were identified mainly through customer interviews.
The specifications and production of the datasets are discussed. Generally, datasets have a product specification, but there is a clear need for standardization. Graphical maps are still considered to be the main source of datasets. NMAs have defined general criteria for quality of datasets, but detailed criteria will be used in the future. Subcontracting the production appears to be quite common. Nearly 75% of the NMAs subcontract part of their production. Surprisingly, cost is not the major reason cited, but rather the acceleration of production.
Finally, quality evaluation procedures and data quality issues are discussed. The NMAs recognize the geographic standards are being developed, but evidently some education is needed to evaluate quality. Some quality elements and elements are not well known. Assuring customer of data quality appears to be a major issue. However, quality results are not forwarded to customers, which implies that evaluation procedures are not functioning properly. Current attitudes on quality and the need for proper quality specification indicate the possibility that remaining issues will be solved in the future.Numéro de notice : C2001-014 Affiliation des auteurs : COGIT+Ext (1988-2011) Thématique : GEOMATIQUE Nature : Communication DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f20008.pd [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64923 Structuring and enriching metadata to enable users' access to geographic information resources / Bénédicte Bucher (2001)
contenu dans Mapping the 21st century: the 20th International Cartographic Conference, ICC 2001, Beijing, China, August 6 - 10, 2001, vol 4. Proceedings / L. Li (2001)
Titre : Structuring and enriching metadata to enable users' access to geographic information resources Type de document : Article/Communication Auteurs : Bénédicte Bucher , Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2001 Conférence : ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings Importance : pp 2791 - 2797 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] carte interactive
[Termes IGN] information géographique
[Termes IGN] intelligence artificielle
[Termes IGN] interface utilisateur
[Termes IGN] internet
[Termes IGN] métadonnées
[Termes IGN] utilisateurRésumé : (Auteur) A crucial requirement for the effective exploitation of geographic information is users' access to the knowledge held in corresponding stored resources, i.e. their understanding of what can be derived from available geographic databases and software. At the core of it is the problem of how to share and reuse knowledge, a major current challenge of Artificial Intelligence (AI). The work presented here extends upon lessons learnt in AI. The proposed solution to the users access issue is an expert system that stores geographical knowledge derivation recipes, and that allows users to browse and customise these recipes. Specifically, we build a model representing the recipes components,i.e. geographic application patterns. This model structures metadata about geographic data and metadata about stored processes, and it describes the usage of these data and processes. A prototype of this system, coded in java, is presented in this paper. Numéro de notice : C2001-013 Affiliation des auteurs : COGIT (1988-2011) Autre URL associée : vers HAL Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f19005.pd [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64922 Documents numériques
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contenu dans Mapping the 21st century: the 20th International Cartographic Conference, ICC 2001, Beijing, China, August 6 - 10, 2001, vol 2. Proceedings / L. Li (2001)
Titre : The world in the pocket : toward a mobile cartography Type de document : Article/Communication Auteurs : Tumasch Reichenbacher, Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2001 Conférence : ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings Importance : pp 2514 - 2521 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] appareil portable
[Termes IGN] format SVG
[Termes IGN] ordinateur de poche
[Termes IGN] ordinateur portable
[Termes IGN] système d'information géographique
[Termes IGN] système de numérisation mobile
[Termes IGN] transmission de données
[Termes IGN] visualisation dynamiqueRésumé : (Auteur) The dawn of new technologies on the horizon, such as telecommunication, mobile internet; and computing devices, offers new chances to the discipline of cartography. However, existing approches to mobile cartography mostly have a commercial background and are rather technology centred. This quite narrow view ignores many relevant problems and does not fully profit from the new possibilities a mobile cartography could provide. Hence, we will sketch a general conceptual framework for cartography in a mobile environment .After the identification of specific user tasks and requests in a mobile environment suitable models of context and user's interests of preferences are highlighted. The process of adaptive and dynamic generation of visualisations for mobile users is illustrated and the key research fields involved are pointed out. An example demonstrates the benefits of dynamic visualisation of geoinformation on mobile device. It should illustrate the basic ideas of mobile cartography and prove the flexibility of vector data (e.g. SVG) as an efficient and useful means of visualisation in a mobile context. Numéro de notice : C2001-052 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f16005.pd [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64959
contenu dans Mapping the 21st century: the 20th International Cartographic Conference, ICC 2001, Beijing, China, August 6 - 10, 2001, vol 2. Proceedings / L. Li (2001)
Titre : Three-dimensional city modeling from airborne laser scanning Type de document : Article/Communication Auteurs : Hiroshi Masaharu, Auteur ; et al., Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2001 Conférence : ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings Importance : pp 1337 - 1343 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] lasergrammétrie
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] modélisation 3D
[Termes IGN] réalité virtuelle
[Termes IGN] système d'information géographique
[Termes IGN] visualisation 3DRésumé : (Auteur) A method to automatically make 3-D city models from airborne laser scanner data was developed. By comparing another 3-D model made using 2-D map data, the 3-D data specifications are discussed from a cartographic aspect. Though there are normally no boundary data between parts of a building with different stories in 2-D map data, we consider the distinction is necessary for 3D modeling. This indicates a merit of segmentation method of laser scanner data in 3D modeling. Numéro de notice : C2001-051 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f11043.pd [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64958 PermalinkVirtual and augmented reality interfaces: empirical findings and implications for spatial visualization / Nick Hedley (2001)PermalinkPermalink