Centre de documentation
scientifique

Dépouillements

Innovations in individual feature history management: the significance of feature-based temporal model / J. Choi in Geoinformatica, vol 12 n° 1 (March - May 2008)  

Public [article]  inGeoinformatica > vol 12 n° 1 (March - May 2008) . - pp 1 - 20 Titre : Innovations in individual feature history management: the significance of feature-based temporal model Type de document : Article/Communication Auteurs : J. Choi, Auteur ; J. Seong, Auteur ; B. Kim, Auteur ; E. Lynn Usery, Auteur Année de publication : 2008 Article en page(s) : pp 1 - 20 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] couche thématique [Termes IGN] données multitemporelles [Termes IGN] historique des données [Termes IGN] modèle conceptuel de données localisées [Termes IGN] modèle conceptuel de données spatio-temporelles [Termes IGN] modèle relationnel [Termes IGN] SIG 4D Résumé : (Auteur) A feature relies on three dimensions (space, theme, and time) for its representation. Even though spatiotemporal models have been proposed, they have principally focused on the spatial changes of a feature. In this paper, a feature-based temporal model is proposed to represent the changes of both space and theme independently. The proposed model modifies the ISO’s temporal schema and adds new explicit temporal relationship structure that stores temporal topological relationship with the ISO’s temporal primitives of a feature in order to keep track feature history. The explicit temporal relationship can enhance query performance on feature history by removing topological comparison during query process. Further, a prototype system has been developed to test a proposed feature-based temporal model by querying land parcel history in Athens, Georgia. The result of temporal query on individual feature history shows the efficiency of the explicit temporal relationship structure. Copyright Springer Numéro de notice : A2008-067 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-007-0019-y En ligne : https://doi.org/10.1007/s10707-007-0019-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29062 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-08011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Approximating the visible region of a point on a terrain / B. Ben-Moshe in Geoinformatica, vol 12 n° 1 (March - May 2008)  

Public [article]  inGeoinformatica > vol 12 n° 1 (March - May 2008) . - pp 21 - 36 Titre : Approximating the visible region of a point on a terrain Type de document : Article/Communication Auteurs : B. Ben-Moshe, Auteur ; P. Carmi, Auteur ; M.J. Katz, Auteur Année de publication : 2008 Article en page(s) : pp 21 - 36 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] approximation [Termes IGN] interpolation [Termes IGN] Triangulated Irregular Network [Termes IGN] visibilité Résumé : (Auteur) Given a terrain and a point p on or above it, we wish to compute the region Rp that is visible from p. We present a generic radar-like algorithm for computing an approximation of Rp. The algorithm interpolates the visible region between two consecutive rays (emanating from p) whenever the rays are close enough; that is, whenever the difference between the sets of visible segments along the cross sections in the directions specified by the rays is below some threshold. Thus the density of the sampling by rays is sensitive to the shape of the visible region. We suggest a specific way to measure the resemblance (difference) and to interpolate the visible region between two consecutive rays. We also present an alternative algorithm, which uses circles of increasing radii centered at p instead of rays emanating from p. Both algorithms compute a representation of the (approximated) visible region that is especially suitable for is-visible-from-p queries, i.e., given a query point q on the terrain determine whether q is visible from p. Finally, we report on the experiments that we performed with these algorithms and with their corresponding fixed versions, using a natural error measure. Our main conclusion is that the radar-like algorithm is significantly better than the others. Copyright Springer Numéro de notice : A2008-068 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-006-0017-5 En ligne : https://doi.org/10.1007/s10707-006-0017-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29063 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-08011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

An application of advanced spatio-temporal formalisms to behavioural ecology / A. Raffaeta in Geoinformatica, vol 12 n° 1 (March - May 2008)  

Public [article]  inGeoinformatica > vol 12 n° 1 (March - May 2008) . - pp 37 - 72 Titre : An application of advanced spatio-temporal formalisms to behavioural ecology Type de document : Article/Communication Auteurs : A. Raffaeta, Auteur ; T. Caccarelli, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 37 - 72 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] ArcView [Termes IGN] données spatiotemporelles [Termes IGN] MADS [Termes IGN] Mammalia [Termes IGN] migration animale [Termes IGN] modèle conceptuel de données spatio-temporelles [Termes IGN] surveillance écologique [Termes IGN] système d'information géographique Résumé : (Auteur) There is great potential for the development of many new applications using data on mobile objects and mobile regions. To promote these kinds of applications advanced data management techniques for the representation and analysis of mobility-related data are needed. Together with application experts (behavioural ecologists), we investigate how two novel data management approaches may help. We focus on a case study concerning the analysis of fauna behaviour, in particular crested porcupines, which represents a typical example of mobile object monitoring. The first technique we experiment with is a recently developed conceptual spatio-temporal data modelling approach, MADS. This is used to model the schema of the database suited to our case study. Relying on this first outcome a subset of the problem is represented in the logical language MuTACLP. This allows us to formalise and solve the queries which enable the behavioural ecologists to derive crested porcupines behaviour from the raw data on animal movements. Finally, we investigate the support from a commercial Geographic Information System (GIS) for the analysis of spatio-temporal data. We present a way to integrate MuTACLP and a GIS, combining the advantages of GIS technology and the expressive power of MuTACLP. Copyright Springer Numéro de notice : A2008-069 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-006-0016-6 En ligne : https://doi.org/10.1007/s10707-006-0016-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29064 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-08011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A multi-parameter approach to automated building grouping and generalization / Hongxiang Yan in Geoinformatica, vol 12 n° 1 (March - May 2008)  

Public [article]  inGeoinformatica > vol 12 n° 1 (March - May 2008) . - pp 73 - 89 Titre : A multi-parameter approach to automated building grouping and generalization Type de document : Article/Communication Auteurs : Hongxiang Yan, Auteur ; Robert Weibel, Auteur ; B. Yang, Auteur Année de publication : 2008 Article en page(s) : pp 73 - 89 Langues : Anglais (eng) Descripteur : [Termes IGN] détection du bâti [Termes IGN] diagramme de Voronoï [Termes IGN] généralisation cartographique automatisée [Termes IGN] généralisation du bâti [Termes IGN] triangulation de Delaunay [Vedettes matières IGN] Généralisation Résumé : (Auteur) This paper presents an approach to automated building grouping and generalization. Three principles of Gestalt theories, i.e. proximity, similarity, and common directions, are employed as guidelines, and six parameters, i.e. minimum distance, area of visible scope, area ratio, edge number ratio, smallest minimum bounding rectangle (SMBR), directional Voronoi diagram (DVD), are selected to describe spatial patterns, distributions and relations of buildings. Based on these principles and parameters, an approach to building grouping and generalization is developed. First, buildings are triangulated based on Delaunay triangulation rules, by which topological adjacency relations between buildings are obtained and the six parameters are calculated and recorded. Every two topologically adjacent buildings form a potential group. Three criteria from previous experience and Gestalt principles are employed to tell whether a 2-building group is ‘strong,’ ‘average’ or ‘weak.’ The ‘weak’ groups are deleted from the group array. Secondly, the retained groups with common buildings are organized to form intermediate groups according to their relations. After this step, the intermediate groups with common buildings are aggregated or separated and the final groups are formed. Finally, appropriate operators/algorithms are selected for each group and the generalized buildings are achieved. This approach is fully automatic. As our experiments show, it can be used primarily in the generalization of buildings arranged in blocks. Copyright Springer Numéro de notice : A2008-070 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-007-0020-5 En ligne : https://doi.org/10.1007/s10707-007-0020-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29065 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-08011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Techniques for computing fitness of use (FoU) for time series datasets with applications in the geospatial domain / L. Fu in Geoinformatica, vol 12 n° 1 (March - May 2008)  

Public [article]  inGeoinformatica > vol 12 n° 1 (March - May 2008) . - pp 91 - 115 Titre : Techniques for computing fitness of use (FoU) for time series datasets with applications in the geospatial domain Type de document : Article/Communication Auteurs : L. Fu, Auteur ; Leen-Kiat Soh, Auteur ; Ashok Samal, Auteur Année de publication : 2008 Article en page(s) : pp 91 - 115 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] jeu de données localisées [Termes IGN] pertinence [Termes IGN] série temporelle [Termes IGN] théorie de Dempster-Shafer Résumé : (Auteur) Time series data are widely used in many applications including critical decision support systems. The goodness of the dataset, called the Fitness of Use (FoU), used in the analysis has direct bearing on the quality of the information and knowledge generated and hence on the quality of the decisions based on them. Unlike traditional quality of data which is independent of the application in which it is used, FoU is a function of the application. As the use of geospatial time series datasets increase in many critical applications, it is important to develop formal methodologies to compute their FoU and propagate it to the derived information, knowledge and decisions. In this paper we propose a formal framework to compute the FoU of time series datasets. We present three different techniques using the Dempster–Shafer belief theory framework as the foundation. These three approaches investigate the FoU by focusing on three aspects of data: data attributes, data stability, and impact of gap periods, respectively. The effectiveness of each approach is shown using an application in hydrological datasets that measure streamflow. While we use hydrological information analysis as our application domain in this research, the techniques can be used in many other domains as well. Copyright Springer Numéro de notice : A2008-071 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-007-0025-0 En ligne : https://doi.org/10.1007/s10707-007-0025-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29066 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-08011	RAB	Revue	Centre de documentation	En réserve L003	Disponible