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Shall 3-D city models be managed in a commercial database? / G. Groger in GIS Geo-Informations-Systeme, vol 2004 n° 9 (September 2004)

Public [article]  inGIS Geo-Informations-Systeme > vol 2004 n° 9 (September 2004) . - pp 9 - 15 Titre : Shall 3-D city models be managed in a commercial database? Type de document : Article/Communication Auteurs : G. Groger, Auteur ; M. Reuter, Auteur ; L. Plumer, Auteur Année de publication : 2004 Article en page(s) : pp 9 - 15 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes descripteurs IGN] Arbre-R [Termes descripteurs IGN] base de données relationnelles [Termes descripteurs IGN] modèle 3D de l'espace urbain [Termes descripteurs IGN] Oracle 9I [Termes descripteurs IGN] performance [Termes descripteurs IGN] requête spatiale [Termes descripteurs IGN] système de gestion de base de données [Termes descripteurs IGN] système de gestion de bases de données relationnelles Résumé : (Auteur) An increasing number of municipalities and companies start to build up three-dimensional city models. These are the precondition for many relevant GIS applications, for example visualization, city and land use planning as well as telecommunications planning and disaster management. These municipalities and companies are faced with the strategic decision how to manage the collected data in a sustainable and interoperable way. The paper answers the questions whether commercial databases shall be used to manage 3-D city models, and to which degree modeling, efficient analysis and interoperable exchange of data is supported by these databases. The focus is on the widespread commercial database system oracle 9i Spatial. Numéro de notice : A2004-402 Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26929 [article]

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Linking different geospatial databases by explicit relations / S. Volz in GIS Geo-Informations-Systeme, vol 2004 n° 9 (September 2004)

Public [article]  inGIS Geo-Informations-Systeme > vol 2004 n° 9 (September 2004) . - pp 16 - 23 Titre : Linking different geospatial databases by explicit relations Type de document : Article/Communication Auteurs : S. Volz, Auteur ; Volker Walter, Auteur Année de publication : 2004 Article en page(s) : pp 16 - 23 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes descripteurs IGN] appariement semi-automatique [Termes descripteurs IGN] appariement topologique [Termes descripteurs IGN] base de données localisées [Termes descripteurs IGN] intégration de données [Termes descripteurs IGN] ontologie [Termes descripteurs IGN] représentation multiple Résumé : (Auteur) The growing awareness of the importance of spatial information has led to a continuously increasing demand for geospatial data. Thus, a lot of different companies and institutions have evolved that are aiming at satisfying this demand by capturing the real world according to the needs of different applications. This process involves that one and the same real world object is stored in several representations in different geospatial databases. The integration of these representations is a major research challenge in the field of GIS. In our approach we use a semi-automatic matching tool for defining relations between representations on the instance level. These relations are used in order to automatically derive an integrated data schema. The relations on the instance level as well as the integrated data schema can be used for automatically merging data sets, for automatically transferring updates from one data set into another or for a common analysis of spatial data from different sources. Numéro de notice : A2004-403 Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26930 [article]

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Continuous generalization for fast and smooth visualization on small displays / Monika Sester in GIS Geo-Informations-Systeme, vol 2004 n° 9 (September 2004)

Public [article]  inGIS Geo-Informations-Systeme > vol 2004 n° 9 (September 2004) . - pp 24 - 30 Titre : Continuous generalization for fast and smooth visualization on small displays Type de document : Article/Communication Auteurs : Monika Sester, Auteur ; C. Brenner, Auteur Année de publication : 2004 Article en page(s) : pp 24 - 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] algorithme de Douglas-Peucker [Termes descripteurs IGN] généralisation à la volée [Termes descripteurs IGN] généralisation cartographique automatisée [Termes descripteurs IGN] simplification de contour [Termes descripteurs IGN] simplification de surface [Termes descripteurs IGN] système de numérisation mobile [Termes descripteurs IGN] visualisation 3D [Termes descripteurs IGN] visualisation cartographique [Vedettes matières IGN] Généralisation Résumé : (Auteur) With the increasing availability of small mobile computers, there is also an increasing demand for visualizing cartographic objects on those devices. Prominent applications are location based services in general, and car and pedestrian navigation in particular. In order to be able to offer both detail and overview of a spatial situation, the devices have to provide flexible zooming in and out in real-time. The presentation of spatial data sets in different zoom levels or resolutions is usually achieved using generalization operations. In this paper, we will describe an approach to decompose generalization methods into elementary operations that can then be implemented in a continuous way. For example in the case of displacement, an object will not simply jump from one position to the other, but slowly shifted from its original position to the new one. In the case of simplification of building ground plans, the elementary operations e.g. care for removing extrusions or intrusions of buildings, as well as offsets. Numéro de notice : A2004-404 Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26931 [article]

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Determination of characteristic site period and preliminary ground response analysis according to resonance by using GIS / M. Tun in GIS Geo-Informations-Systeme, vol 2004 n° 9 (September 2004)

Public [article]  inGIS Geo-Informations-Systeme > vol 2004 n° 9 (September 2004) . - pp 31 - 36 Titre : Determination of characteristic site period and preliminary ground response analysis according to resonance by using GIS Type de document : Article/Communication Auteurs : M. Tun, Auteur ; Ugur Avdan, Auteur ; M. Altan, Auteur Année de publication : 2004 Article en page(s) : pp 31 - 36 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes descripteurs IGN] bâtiment [Termes descripteurs IGN] ESKISEHIR [Termes descripteurs IGN] milieu urbain [Termes descripteurs IGN] résonance [Termes descripteurs IGN] risque naturel [Termes descripteurs IGN] séisme [Termes descripteurs IGN] système d'information géographique [Termes descripteurs IGN] Turquie [Termes descripteurs IGN] vibration Résumé : (Auteur) Ground response analyses are mostly used for the development of design response spectra in the modern earthquake engineering. After 1999 Marmara Earthquake, the damages were mostly related with unavailable soil conditions and this unavailability were analysed according to liquefaction analysis. In this study, granular soil which the Eskisehir urban area is located has been studied according to vibration period. Eskisehir is the city, which would be influenced negatively by the earthquake due to unavailable soil conditions and uncontrolled constructions. Five different districts of the Eskisehir municipality were included in this studied area. Characteristic site period (Ts), which is defined as the period of vibration corresponding to the fundamental frequency has been obtained for each 32 test points. GIS which is a powerful tool and technique for especially earth science, has been used for the preparation of characteristic site period map (Tf) of the studied area. After that, the number of story of each building has been determined by in-situ studies in the studied districts. Numéro de notice : A2004-405 Thématique : GEOMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26932 [article]

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High resolution mapping with small satellites / R. Sandau in GIS Geo-Informations-Systeme, vol 2004 n° 9 (September 2004)

Public [article]  inGIS Geo-Informations-Systeme > vol 2004 n° 9 (September 2004) . - pp 37 - 42 Titre : High resolution mapping with small satellites Type de document : Article/Communication Auteurs : R. Sandau, Auteur Année de publication : 2004 Article en page(s) : pp 37 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] analyse comparative [Termes descripteurs IGN] capteur (télédétection) [Termes descripteurs IGN] capteur en peigne [Termes descripteurs IGN] capteur passif [Termes descripteurs IGN] limite de résolution géométrique [Termes descripteurs IGN] pas d'échantillonnage au sol Résumé : (Auteur) Civil space-borne Earth surface mapping started in 1972 with a 80 m GSD provided by ERTS, later renamed to landsat-1. Nowadays, the GSD approaches 1 m or even less. This trend was supported by the improvements in diverse fields of technology as for instance optics, mechanics and materials, electronics, signal processing, communications and navigation. The space-borne mapping systems always attempted to achieve the highest ground resolution possible with the available technology at the given time. SAR systems are an alternative to passive optical systems ; they also benefit from the technology improvements. But the most promising prospects for high resolution mapping with small satellites are connected with passive optical systems, especially push-broom systems. The paper tries to analyse how far can we go in decreasing the GSD using instruments and spacecrafts decreasing in size, mass and power consumption. Numéro de notice : A2004-406 Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26933 [article]

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