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Knowledge acquisition for the automatic interpretation of spatial data / Monika Sester in International journal of geographical information science IJGIS, vol 14 n° 1 (january 2000)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 14 n° 1 (january 2000) . - pp 1 - 24 Titre : Knowledge acquisition for the automatic interpretation of spatial data Type de document : Article/Communication Auteurs : Monika Sester, Auteur Année de publication : 2000 Article en page(s) : pp 1 - 24 Note générale : Bibliographie 2 pages Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] acquisition de connaissances [Termes IGN] données localisées [Termes IGN] interprétation automatique [Termes IGN] système à base de connaissances Résumé : (Auteur) In order to handle the ever increasing amount of digital data efficiently, methods and techniques for automation have to be available. A key issue is the use of knowledge-based systems to interpret the data and operate on it in an automatic way. Interpretation requires knowledge about the underlying concepts in the data. Providing the necessary knowledge, however, is a bottleneck in automation. In this paper, an approach to semi-automatic knowledge acquisition is described. The knowledge is derived from given example data using supervised machine learning. An application of the approach in the domain of the interpretation of unstructured spatial data is given, and possible further applications are outlined. Numéro de notice : A2000-223 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240930 En ligne : https://doi.org/10.1080/136588100240930 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21638 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-00011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Accuracy of count data transferred through the areal weighting interpolation method / Yukio Sadahiro in International journal of geographical information science IJGIS, vol 14 n° 1 (january 2000)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 14 n° 1 (january 2000) . - pp 25 - 50 Titre : Accuracy of count data transferred through the areal weighting interpolation method Type de document : Article/Communication Auteurs : Yukio Sadahiro, Auteur Année de publication : 2000 Article en page(s) : pp 25 - 50 Note générale : Bibliographie 1 page Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] interpolation par pondération de zones [Termes IGN] modèle stochastique [Termes IGN] précision des données Résumé : (Auteur) This paper analyses the accuracy of count data transferred from a zonal system to an incompatible zone through the areal weighting interpolation method. To treat a variety of situations in a theoretical framework, stochastic models representing areal weighting interpolation are developed. The relationship between the accuracy of estimates and the size of source zones is analytically investigated by use of a proposed model. The results strongly suggested that smaller zones give better estimates on a wide range of zonal systems. The effect of the shape of source zones and the target zone on estimation accuracy is also numerically examined, and is also found to be significant. Numéro de notice : A2000-224 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240949 En ligne : https://doi.org/10.1080/136588100240949 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21639 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-00011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A stochastic process-based model for the positional error of line segments in GIS / Wei Shi in International journal of geographical information science IJGIS, vol 14 n° 1 (january 2000)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 14 n° 1 (january 2000) . - pp 51 - 66 Titre : A stochastic process-based model for the positional error of line segments in GIS Type de document : Article/Communication Auteurs : Wei Shi, Auteur ; W. Liu, Auteur Année de publication : 2000 Article en page(s) : pp 51 - 66 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] modèle stochastique [Termes IGN] modélisation [Termes IGN] segment de droite [Termes IGN] système d'information géographique Résumé : (Auteur) This paper presents a model for describing the positional error of line segments in geographical information systems (GIS). The model is based on stochastic process theory with the assomptions that the errors of the endpoints of a line segment follow two-dimensional normal distributions. The distribution and density fonctions of the line segments are derived statistically. The uncertainty information matrix of line segments is derived to indicate the error of an arbitrary point on the line segment. This model covers the cases where two-end points are correlated to each other and points on the line segment are stochastically continuous to each other. The model is a more generic error band model than those previously developed ans is called the G-Band model. Numéro de notice : A2000-225 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240958 En ligne : https://doi.org/10.1080/136588100240958 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21640 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-00011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Assessment of error in digital vector data using fractal geometry / Matt Duckham in International journal of geographical information science IJGIS, vol 14 n° 1 (january 2000)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 14 n° 1 (january 2000) . - pp 67 - 84 Titre : Assessment of error in digital vector data using fractal geometry Type de document : Article/Communication Auteurs : Matt Duckham, Auteur ; Jane E. Drummond, Auteur Année de publication : 2000 Article en page(s) : pp 67 - 84 Note générale : Bibliographie 2 pages Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] données localisées numériques [Termes IGN] données vectorielles [Termes IGN] erreur [Termes IGN] géométrie fractale [Termes IGN] modèle d'erreur [Termes IGN] modèle d'incertitude [Termes IGN] Ordnance Survey (UK) Résumé : (Auteur) This paper presents a new method for assessment of error in digital vector geographic data, where the features represented can be modelled closely by fractal geometry. Using example hydrological data from Ordnance Survey of Great Britain maps at a range of scales, a resolution smaller than which the digital representation of the feature does not exhibit fractal characteristics can be calculated. It is proposed that this resolution reflects the minimum ground resolution of the map, which in turn can be related to the source map scale. Numéro de notice : A2000-227 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/136588100240967 En ligne : https://doi.org/10.1080/136588100240967 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21642 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-00011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Using desktop GIS for the investigation of accessibility by public transport: an isochrone approach / D. O'sullivan in International journal of geographical information science IJGIS, vol 14 n° 1 (january 2000)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 14 n° 1 (january 2000) . - pp 85 - 104 Titre : Using desktop GIS for the investigation of accessibility by public transport: an isochrone approach Type de document : Article/Communication Auteurs : D. O'sullivan, Auteur ; A. Morrison, Auteur ; J. Shearer, Auteur Année de publication : 2000 Article en page(s) : pp 85 - 104 Note générale : Bibliographie 1 page Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] accessibilité [Termes IGN] système d'information géographique [Termes IGN] transport collectif [Termes IGN] transport public Résumé : (Auteur) The application of existing desktop geographical information systems (GIS) to the assessment of accessibility by public transport bas been investigated. Two approaches to the measurement of accessibility-aggregate accessibility measures and the space-time geography framework-are described. It is suggested that isochrones (lines of equal travel time) are a natural way to combine these approaches in a GIS setting. A desktop GIS application bas been developed which can automatically generate isochrones for travel by public transport. The application successfully copes with the complexity of the public transport of a large city (Glasgow), comprising bus, rail, and underground services. Journeys may include an initial walk to a public transport stop, several interchanges between services of the same or different modes, and a final walk. Options provide for plotting isochrones for journeys by bus only or train only; and for exact or approximate isochrones, the latter generated more quickly. The application is described in some detail, and assessed. Sample outputs are presented, including an example involving further processing of isochrones to produce a constrained accessibility map, which demonstrates the generality of this approach. Numéro de notice : A2000-234 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240976 En ligne : https://doi.org/10.1080/136588100240976 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21649 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-00011	RAB	Revue	Centre de documentation	En réserve L003	Disponible