Paru le : 01/03/2000 ISBN/ISSN/EAN : 1365-8816 | ![]() |
[n° ou bulletin]
[n° ou bulletin]
| ![]() |
Exemplaires(1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
---|---|---|---|---|---|
079-00021 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
Dépouillements


Quantifying positional error induced by line simplification / H. Veregin in International journal of geographical information science IJGIS, vol 14 n° 2 (march 2000)
![]()
[article]
Titre : Quantifying positional error induced by line simplification Type de document : Article/Communication Auteurs : H. Veregin, Auteur Année de publication : 2000 Article en page(s) : pp 113 - 130 Note générale : Bibliographie 1 page Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] données localisées
[Termes IGN] erreur de positionnement
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] noeud
[Termes IGN] qualité des données
[Termes IGN] simplification de contourRésumé : (Auteur) This study examines the effects of line simplification on the positional accuracy of linear features. The goal is to quantify the relation between the level of simplification and the degree of positional error, so that users can choose appropriate levels of simplification that will yield results meeting specific accuracy criteria. The study focuses on the Douglas-Peucker line simplification algorithm and examines both natural and anthropogenic features (streams and roads) derived from United States Geological Survey Digital Line Graphs. Results show that error can be modelled at an aggregate level using cumulative frequency curves and their confidence limits. This makes it possible to identify the level of simplification that eliminates the largest number of vertices while still attaining a specific positional accuracy standard. A simple implementation strategy is described in which an optimal level of simplification is identified and simplification is applied selectively for different lines. The study shows that management of simplification-induced error is possible using simple tools well within the reach of GIS users. Numéro de notice : A2000-235 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240877 En ligne : https://doi.org/10.1080/136588100240877 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21650
in International journal of geographical information science IJGIS > vol 14 n° 2 (march 2000) . - pp 113 - 130[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 079-00021 RAB Revue Centre de documentation En réserve L003 Disponible Modelling sustainable urban development by the integration of constrained cellular automata and GIS / X. Li in International journal of geographical information science IJGIS, vol 14 n° 2 (march 2000)
![]()
[article]
Titre : Modelling sustainable urban development by the integration of constrained cellular automata and GIS Type de document : Article/Communication Auteurs : X. Li, Auteur ; A.G. Yeh, Auteur Année de publication : 2000 Article en page(s) : pp 131 - 152 Note générale : Bibliographie 1 page Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] automate cellulaire
[Termes IGN] croissance urbaine
[Termes IGN] développement durable
[Termes IGN] modèle de simulation
[Termes IGN] planification urbaine
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Cellular Automata (CA) have attracted growing attention in urban simulation because their capability in spatial modelling is not fully developed in GIS. This paper discusses how cellular automata (CA) can be extended and integrated with GIS to help planners to search for better urban forms for sustainable development. The cellular automata model is built within a grid-GIS system to facilitate easy access to GIS databases for constructing the constraints. The essence of the model is that constraint space is used to regulate cellular space. Local, regional and global constraints play important roles in affecting modelling results. In addition, 'grey' cells are defined to represent the degrees or percentages of urban land development during the iterations of modelling for more accurate results. The model can be easily controlled by the parameter k using a power transformation function for calculating the constraint scores. It can be used as a useful planning tool to test the effects of different urban development scenarios. Numéro de notice : A2000-236 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240886 En ligne : https://doi.org/10.1080/136588100240886 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21651
in International journal of geographical information science IJGIS > vol 14 n° 2 (march 2000) . - pp 131 - 152[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 079-00021 RAB Revue Centre de documentation En réserve L003 Disponible Fuzzy set theory and thematic maps: accuracy assessment and area estimation / Curtis E. Woodcock in International journal of geographical information science IJGIS, vol 14 n° 2 (march 2000)
![]()
[article]
Titre : Fuzzy set theory and thematic maps: accuracy assessment and area estimation Type de document : Article/Communication Auteurs : Curtis E. Woodcock, Auteur ; Sucharita Gopal, Auteur Année de publication : 2000 Article en page(s) : pp 153 - 172 Note générale : Bibliographie 1 page Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] carte de la végétation
[Termes IGN] Etats-Unis
[Termes IGN] forêt
[Termes IGN] précision
[Termes IGN] sous ensemble flouRésumé : (Auteur) Traditionally, the classes in thematic maps have been treated as crisp sets, using classical set theory. In this formulation, map classes are assumed to be mutually exclusive and exhaustive. This approach limits the ability of thematic maps to represent the continuum of variation found in most landscapes. Substitution of fuzzy sets allows more flexibility for treatment of map classes in the areas of accuracy assessment and area estimation. Accuracy assessment methods based on fuzzy sets allow consideration of the magnitude of errors and assessment of the frequency of ambiguity in map classes. An example of an accuracy assessment from a vegetation map of the Plumas National Forest illustrates the implementation of these methods. Area estimation based on fuzzy sets and using accuracy assessment data allows estimation of the area of classes as a function of levels of class membership. The fuzzy area estimation methods are an extension of previous methods presented by Card (1982). One interesting result is that the sum of the areas of the classes in a map need not be unity. This approach allows a wider range of queries within a GIS. Numéro de notice : A2000-237 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240895 En ligne : https://doi.org/10.1080/136588100240895 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21652
in International journal of geographical information science IJGIS > vol 14 n° 2 (march 2000) . - pp 153 - 172[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 079-00021 RAB Revue Centre de documentation En réserve L003 Disponible Application of fuzzy measures in multi-criteria evaluation in GIS / H. Jiang in International journal of geographical information science IJGIS, vol 14 n° 2 (march 2000)
![]()
[article]
Titre : Application of fuzzy measures in multi-criteria evaluation in GIS Type de document : Article/Communication Auteurs : H. Jiang, Auteur ; J. Ronald Eastman, Auteur Année de publication : 2000 Article en page(s) : pp 173 - 184 Note générale : Bibliographie 1 page Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] analyse multicritère
[Termes IGN] flou
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Multi-criteria évaluation (MCE) is perhaps the most fondamental of decision support opérations in geographical information systems (GIS). This paper reviews two main MCE approaches employed in GIS, namely Boolean and Weighted Linear Combination (WLC), and discusses issues and problems associated with both. To resolve the conceptuel differences between the two approaches, this paper proposes the application of fuzzy measures, a concept that is broader but that includes fuzzy set membership, and argues that the standardized factors of MCE belong to a general class of fuzzy measures and the more specific instance of fuzzy set membership. This perspective provides a strong theoretical basis for the standardisation of factors and their subsequent aggregation. In this contexte, a new aggregation operator that accommodates and extends the Boolean and WLC approaches is discussed : the Ordered Weighted Average. A case study of industriel allocation in Nakuru, Kenya is employed to illustrate the different approaches. Numéro de notice : A2000-238 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240903 En ligne : https://doi.org/10.1080/136588100240903 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21653
in International journal of geographical information science IJGIS > vol 14 n° 2 (march 2000) . - pp 173 - 184[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 079-00021 RAB Revue Centre de documentation En réserve L003 Disponible Analysing forest fragmentation using spatial autocorrelation, graphs and GIS / S.A. Roberts in International journal of geographical information science IJGIS, vol 14 n° 2 (march 2000)
![]()
[article]
Titre : Analysing forest fragmentation using spatial autocorrelation, graphs and GIS Type de document : Article/Communication Auteurs : S.A. Roberts, Auteur ; G. Brent Hall, Auteur ; P.H. Calamai, Auteur Année de publication : 2000 Article en page(s) : pp 185 - 204 Note générale : Bibliographie 2 pages Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] autocorrélation spatiale
[Termes IGN] écologie
[Termes IGN] forêt
[Termes IGN] graphe
[Termes IGN] système d'information géographiqueRésumé : (Auteur) This paper presents a replicable methodology to assess the extent of fragmentation in forests induced by natural and man-made features and disturbances. The analysis is presented in the context of conservation ecology research and its relevance to the development of environmental protection policy is discussed. Methodologically, the approach utilizes Geographical Information Systems (GIS), Relational Database Management Systems (DBMS), symbolic mathematics software, spatial autocorrelation statistics and graph data structures. The intersection of these technologies and techniques offers a potentially fertile area to extend the meaningful definition of natural forested areas and their management as well as our understanding of how these areas can be preserved through conservation policy. The paper concludes with suggestions for further extensions of the research. Numéro de notice : A2000-239 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240912 En ligne : https://doi.org/10.1080/136588100240912 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21654
in International journal of geographical information science IJGIS > vol 14 n° 2 (march 2000) . - pp 185 - 204[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 079-00021 RAB Revue Centre de documentation En réserve L003 Disponible