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A software framework to create vector-topology in parallel GIS operations / M.J. Mineter in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 3 (may 2003) . - pp 203 - 222 Titre : A software framework to create vector-topology in parallel GIS operations Type de document : Article/Communication Auteurs : M.J. Mineter, Auteur Année de publication : 2003 Article en page(s) : pp 203 - 222 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] données vectorielles [Termes IGN] jeu de données localisées [Termes IGN] programmation informatique [Termes IGN] relation topologique [Termes IGN] système d'information géographique [Termes IGN] traitement parallèle Résumé : (Auteur) Parallel processing comprises the concurrent use of multiple processors to speed execution of one operation. Although techniques suited to most of the common geographical data models have been prototyped, the prominent exception has been vector topology. This paper explores whether operations that create a vectortopological dataset can benefit from parallelisation. It describes techniques for using multiple processors concurrently to create vectortopology for multiple subareas, and for stitching these subareas together to form the resultant dataset. To achieve performance gains over sequential processing, the overhead of the stitching must be less than the gains from the parallel processing of subareas. These methods are tested in the context of the conversion of raster data to polygonal vectortopology. Speedup in comparison to singleprocessor performance is achieved on both a 4processor sharedmemory Sun server and using up to 15 processors of a Cray T3E. The approach taken hides the parallelism and the management of the vectortopology in a software framework that simplifies the task of parallel application development. Numéro de notice : A2003-042 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810210149443 En ligne : https://doi.org/10.1080/13658810210149443 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22339 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-03031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-03032	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Rough and fuzzy geographical data integration / K. Oukbir in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 3 (may 2003) . - pp 223 - 234 Titre : Rough and fuzzy geographical data integration Type de document : Article/Communication Auteurs : K. Oukbir, Auteur ; O. Ahlqvist, Auteur ; J. Keukelaar, Auteur Année de publication : 2003 Article en page(s) : pp 223 - 234 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] approximation [Termes IGN] classification floue [Termes IGN] incertitude des données [Termes IGN] intégration de données [Termes IGN] sous ensemble flou [Termes IGN] traitement d'image Résumé : (Auteur) We show how fuzzy and rough data are transformed into a unified representation using the concept of rough fuzzy sets. We introduced a representation for rough fuzzy classifications that might be used when the classification process introduces uncertainty in the data due to vagueness and indiscernibility. We demonstrate the viability of our method by performing classification experiments using real data. The experiment uses data that have been classified using different classification schemes. To make them compatible we reclassify some data and use some additional knowledge that requires the use of rough fuzzy classifications. Numéro de notice : A2003-043 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810210157750 En ligne : https://doi.org/10.1080/13658810210157750 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22340 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-03031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-03032	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Fuzzy set approach to assessing similarity of categorical maps / Alex Hagen-Zanker in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 3 (may 2003) . - pp 235 - 249 Titre : Fuzzy set approach to assessing similarity of categorical maps Type de document : Article/Communication Auteurs : Alex Hagen-Zanker, Auteur Année de publication : 2003 Article en page(s) : pp 235 - 249 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] carte thématique [Termes IGN] données maillées [Termes IGN] estimation statistique [Termes IGN] Kappa de Cohen [Termes IGN] logique floue [Termes IGN] pixel [Termes IGN] processus [Termes IGN] similitude [Termes IGN] sous ensemble flou Résumé : (Auteur) For the evaluation of results from remote sensing and highresolution spatial models it is often necessary to assess the similarity of sets of maps. This paper describes a method to compare raster maps of categorical data. The method applies fuzzy set theory and involves both fuzziness of location and fuzziness of category. The fuzzy comparison yields a map, which specifies for each cell the degree of similarity on a scale of 0 to 1. Besides this spatial assessment of similarity also an overall value for similarity is derived. This statistic corrects the cellaverage similarity value for the expected similarity. It can be considered the fuzzy equivalent of the Kappa statistic and is therefore called KFuzzy A hypothetical case demonstrates how the comparison method distinguishes minor changes and fluctuations within patterns from major changes. Finally, a practical case illustrates how the method can be useful in a validation process. Numéro de notice : A2003-044 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810210157822 En ligne : https://doi.org/10.1080/13658810210157822 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22341 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-03031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-03032	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Modelling error propagation in vector-based buffer analysis / Wei Shi in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 3 (may 2003) . - pp 251 - 271 Titre : Modelling error propagation in vector-based buffer analysis Type de document : Article/Communication Auteurs : Wei Shi, Auteur ; C.K. Cheung, Auteur ; C. Zhu, Auteur Année de publication : 2003 Article en page(s) : pp 251 - 271 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] analyse de données [Termes IGN] analyse numérique [Termes IGN] analyse spatiale [Termes IGN] base de données localisées [Termes IGN] données vectorielles [Termes IGN] propagation d'erreur [Termes IGN] zone tampon Résumé : (Auteur) Error propagation of buffer analysis in a vectorbased geographical information system (GIS) is studied with the use of statistics and numerical analyses. In this paper, such factors as the error of commission, the error of omission, the discrepant area and the normalized discrepant area are proposed as the error indicators of buffer analysis. Analytical expressions for the error indicators are developed as multiple integrals. A numerical integration method is recommended to find an approximation to the analytical expression. Numéro de notice : A2003-045 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/1365881022000016007 En ligne : https://doi.org/10.1080/1365881022000016007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22342 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-03031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-03032	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Wavelet triangulated irregular networks / J. Wu in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 3 (may 2003) . - pp 273 - 289 Titre : Wavelet triangulated irregular networks Type de document : Article/Communication Auteurs : J. Wu, Auteur ; K. Amaratunga, Auteur Année de publication : 2003 Article en page(s) : pp 273 - 289 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] filtrage linéaire [Termes IGN] format d'image [Termes IGN] jeu de données localisées [Termes IGN] ondelette [Termes IGN] résolution multiple [Termes IGN] transformation en ondelettes [Termes IGN] Triangulated Irregular Network Résumé : (Auteur) GIS applications have recently begun to emerge on the Internet. The management of threedimensional geographic datasets in this distributed environment poses a particularly challenging problem, which highlights the need for a good data representation. This paper presents a new multiresolution data representation: the Wavelet Triangulated Irregular Network (WTIN). Compared to the traditional cellbased Digital Elevation Model (DEM) format and the Triangulated Irregular Network (TIN) format, it is more compact and suitable for scalable distributed GIS services. This format is based on the second generation wavelet theory and is specially designed for geographical height field data. The modified Butterfly scheme is used for constructing the wavelet transform. For every point in the geographic surface, only a single wavelet coefficient is used, which makes the final data representation very efficient and easy to compress. Because the transform used in the data representation is a linear filter operation, the computational efficiency is better than other multiresolution data formats for terrain surfaces. Results from numerical experiments on real data are given to demonstrate that the proposed data representation can be efficiently implemented. The results show that the proposed WTIN data format can provide multiresolution data sets, which achieve significant compression while preserving geographical features. The quality is found to be quite acceptable for geographical terrain representation. Numéro de notice : A2003-046 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/1365881022000016016 En ligne : https://doi.org/10.1080/1365881022000016016 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22343 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-03031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-03032	RAB	Revue	Centre de documentation	En réserve L003	Disponible