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Modelling and prediction of GPS availability with digital photogrammetry and LiDAR / Georges E. Taylor in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 1 - 20 Titre : Modelling and prediction of GPS availability with digital photogrammetry and LiDAR Type de document : Article/Communication Auteurs : Georges E. Taylor, Auteur ; J. Li, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 1 - 20 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] application informatique [Termes IGN] constellation GPS [Termes IGN] données lidar [Termes IGN] modèle numérique de terrain [Termes IGN] photogrammétrie numérique [Termes IGN] positionnement cinématique en temps réel [Termes IGN] récepteur GPS [Termes IGN] satellite GPS [Termes IGN] système d'information géographique [Termes IGN] temps réel [Termes IGN] visibilité Résumé : (Auteur) This paper describes an automated method for predicting the number of satellites visible to a GPS receiver, at any point on the Earth's surface at any time. Intervisibility analysis between a GPS receiver and each potentially visible GPS satellite is performed using a number of different surface models and satellite orbit calculations. The developed software can work with various ephemeris data, and will compute satellite visibility in real time. Real-time satellite availability prediction is very useful for mobile applications such as in-car navigation systems, personal navigations systems and LBS. The implementation of the method is described and the results are reported. Copyright Taylor & Francis Numéro de notice : A2007-023 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810600816540 En ligne : https://doi.org/10.1080/13658810600816540 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28389 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
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079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Metric details of topological line-line relations / K.A. Nedas in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 21 - 48 Titre : Metric details of topological line-line relations Type de document : Article/Communication Auteurs : K.A. Nedas, Auteur ; Max J. Egenhofer, Auteur ; D. Wilmsen, Auteur Année de publication : 2007 Article en page(s) : pp 21 - 48 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] analyse discriminante [Termes IGN] données vectorielles [Termes IGN] intersection spatiale [Termes IGN] objet géographique linéaire [Termes IGN] relation topologique [Termes IGN] spatial metrics [Termes IGN] système d'information géographique Résumé : (Auteur) Many real and artificial entities in geographic space, such as transportation networks and trajectories of movement, are typically modelled as lines in geographic information systems. In a similar fashion, people also perceive such objects as lines and communicate about them accordingly as evidence from research on sketching habits suggests. To facilitate new modalities like sketching that rely on the similarity between qualitative representations, oftentimes multi-resolution models are needed to allow comparisons between sketches and database scenes through successively increasing levels of detail. Within such a setting, topology alone is sufficient only for a coarse estimate of the spatial similarity between two scenes, whereas metric refinements may help extract finer details about the relative positioning and geometry between the objects. The nine-intersection is a topological model that distinguishes 33 relations between two lines based on the content invariant (empty–non-empty intersections) among boundaries, interiors, and exteriors of the lines. This paper extends the nine-intersection model by capturing metric details for line–line relations through splitting ratios and closeness measures. Splitting ratios, which apply to the nine-intersection's non-empty values, are normalized values of lengths and areas of intersections. Closeness measures, which apply to the nine-intersection's empty values, are normalized distances between disjoint object parts. Both groups of measures are integrated into compact representations of topological relations, thereby addressing topological and metric properties of arbitrarily complex line–line relations. Copyright Taylor & Francis Numéro de notice : A2007-024 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600852164 En ligne : https://doi.org/10.1080/13658810600852164 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28390 [article]

Exemplaires(2)

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079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Comparative tempo-spatial pattern analysis: CTSPA / Y. Xie in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 49 - 69 Titre : Comparative tempo-spatial pattern analysis: CTSPA Type de document : Article/Communication Auteurs : Y. Xie, Auteur ; X. Ye, Auteur Année de publication : 2007 Article en page(s) : pp 49 - 69 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse comparative [Termes IGN] analyse de données [Termes IGN] analyse diachronique [Termes IGN] analyse spatiale [Termes IGN] caractérisation [Termes IGN] centroïde [Termes IGN] détection de changement [Termes IGN] Détroit [Termes IGN] données vectorielles [Termes IGN] géographie urbaine [Termes IGN] géométrie vectorielle [Termes IGN] paysage urbain [Termes IGN] polygone [Termes IGN] utilisation du sol [Termes IGN] zone urbaine Résumé : (Auteur) A new method is illustrated for describing the characteristics of urban pattern changes over different time periods. This method employs vector geometry, paired centroids, shared boundary lines, and overlain polygons. Three new statistics are proposed for characterizing local polygon feature changes in quantity, shape, and size. These statistics are standardized, based on conventional theories from urban geography such as directional concentric zones and user-designated corridors to document both regional and global patterns of land-use change. This method is used to analyse land-use changes in metropolitan Detroit between 1990 and 2000. The Detroit case study indicates that the CTSPA statistics are effective in describing urban spatial pattern changes and in characterizing the evolution of discrete urban landscapes over selected periods. Copyright Taylor & Francis Numéro de notice : A2007-025 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600894265 En ligne : https://doi.org/10.1080/13658810600894265 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28391 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Contour line thinning and multigrid generation of raster-based digital elevation models / E. Katona in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 71 - 82 Titre : Contour line thinning and multigrid generation of raster-based digital elevation models Type de document : Article/Communication Auteurs : E. Katona, Auteur Année de publication : 2007 Article en page(s) : pp 71 - 82 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] contour [Termes IGN] données matricielles [Termes IGN] échantillonnage de données [Termes IGN] fonction spline d'interpolation [Termes IGN] modèle numérique de surface Résumé : (Auteur) Thin plate spline interpolation is a widely used approach to generate a digital elevation model (DEM) from contour lines and scattered data. In practice, contour maps are scanned and vectorized, and after resampling in the target grid resolution, interpolation is performed. In this paper we demonstrate the limited accuracy of this process, and propose a high-resolution processing method (without vectorization) that ensures maximum utilization of information in the source data. First, we discuss the mathematical background of thin plate spline interpolation, and explain the multigrid relaxation principle used to speed up convergence. After, we will show why fine tuning is necessary, especially when contour lines and elevation points are processed at the same time. Finally, our own contour thinning method that produces a significant reduction of elevation bias is described. Copyright Taylor & Francis Numéro de notice : A2007-026 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810600816474 En ligne : https://doi.org/10.1080/13658810600816474 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28392 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Measuring rice paddy persistence spanning a century with Japan's oldest topographic maps: georeferencing the Rapid Survey Maps for GIS analysis / D.S. Sprague in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 83 - 95 Titre : Measuring rice paddy persistence spanning a century with Japan's oldest topographic maps: georeferencing the Rapid Survey Maps for GIS analysis Type de document : Article/Communication Auteurs : D.S. Sprague, Auteur ; N. Iwasaki, Auteur ; S Takahashi, Auteur Année de publication : 2007 Article en page(s) : pp 83 - 95 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] carroyage [Termes IGN] carte topographique [Termes IGN] géoréférencement [Termes IGN] Japon [Termes IGN] numérisation de carte [Termes IGN] point d'appui [Termes IGN] projection [Termes IGN] rizière [Termes IGN] système d'information géographique Résumé : (Auteur) The Rapid Survey Maps, or Jinsoku Sokuzu, are the first series of topographic maps covering a large region drawn by modern surveying methods in Japan. These maps have no projection or map grid. To incorporate them into a historical GIS, analysts need to identify valid ground control points to georeference these maps, and identify features that are more likely to be distorted than other features. We studied the internal distortion in Rapid Survey Maps while carrying out an overlay analysis for rice paddies between them and a modern land use map. An irregular overall pattern of distortion implied that most were due to local surveying errors. In particular, long, thin rice paddy branches were distorted, leading to mismatches between rice paddies in the older maps with those in the newer map. This mismatch tended to exaggerate the area of rice paddies lost to non-paddy land uses in the overlay analysis with a modern land use map. Copyright Taylor & Francis Numéro de notice : A2007-027 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600816433 En ligne : https://doi.org/10.1080/13658810600816433 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28393 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Modelling the risk of cyclone wave damage to coral reefs using GIS: a case study of the Great Barrier Reef, 1969-2003 / M.L. Puotinen in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 97 - 120 Titre : Modelling the risk of cyclone wave damage to coral reefs using GIS: a case study of the Great Barrier Reef, 1969-2003 Type de document : Article/Communication Auteurs : M.L. Puotinen, Auteur Année de publication : 2007 Article en page(s) : pp 97 - 120 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] analyse diachronique [Termes IGN] Australie [Termes IGN] cyclone [Termes IGN] dommage matériel [Termes IGN] données maillées [Termes IGN] impact sur l'environnement [Termes IGN] modèle physique [Termes IGN] récif corallien [Termes IGN] répartition géographique [Termes IGN] système d'information géographique Résumé : (Auteur) Tropical cyclones (hurricanes and typhoons) produce high winds that can generate waves capable of damaging coral reefs. As cyclones frequently pass through northeast Australia's Great Barrier Reef (GBR), it is important to understand how the spatial distribution of reef damage changes over time. However, direct measurements of wave damage, or even wave heights or wind speeds, are rare within the GBR. An important factor in estimating whether cyclone damage was possible is the magnitude and duration of high-energy wind and waves. Thus, before the spatio-temporal dynamics of past cyclone damage can be modelled, it is necessary to reconstruct the spread, intensity, and duration of high-energy conditions during individual cyclones. This was done every hour along the track taken by each of 85 cyclones that passed near the GBR from 1969 to 2003, by implementing a cyclone wind hindcasting model directly within a raster GIS using cyclone data available from the Australian Bureau of Meteorology. Three measures of cyclone energy (maximum wind speed—MAX, duration of gales—GALES, and continuous duration of gales—CGALES) were derived from these data. For three cyclones, where field data documenting actual reef damage from cyclone-generated waves were available, the predictive ability of each measure was assessed statistically. All three performed better in predicting reef damage at sites surveyed along the high-energy reef front than those surveyed along the more protected reef back. MAX performed best for cyclone Joy (r2 = 0.5), while CGALES performed best for cyclones Ivor (r2 = 0.23) and Justin (r2 = 0.48). Using thresholds for MAX and GALES obtained via comparison with field data of damage, it was possible to produce a preliminary prediction of the risk of wave damage across the GBR from each of the 85 cyclones. The results suggest that while up to two-thirds of the GBR was at risk from some damage for 30–50% of the time series (~18 out of 35 years), only scattered areas of the region were at risk more frequently than that. Copyright Taylor & Francis Numéro de notice : A2007-028 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600852230 En ligne : https://doi.org/10.1080/13658810600852230 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28394 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Multi-scale correlations between topography and vegetation in a hillside catchment of Honduras / A. Nelson in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 145 - 174 Titre : Multi-scale correlations between topography and vegetation in a hillside catchment of Honduras Type de document : Article/Communication Auteurs : A. Nelson, Auteur ; T. Oberthur, Auteur ; S. Cook, Auteur Année de publication : 2007 Article en page(s) : pp 145 - 174 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse multiéchelle [Termes IGN] appariement d'images [Termes IGN] déboisement [Termes IGN] dégradation de l'environnement [Termes IGN] données topographiques [Termes IGN] flore locale [Termes IGN] Honduras [Termes IGN] indice de végétation [Termes IGN] modèle conceptuel de données localisées [Termes IGN] utilisation du sol Résumé : (Auteur) All systems have causes and effects that can be appreciated at different spatial scales. Understanding and representing the complexity of multi-scale patterns in maps and spatial models are key research objectives. We describe the use of three types of correlation analyses: (1) a standard Pearson correlation coefficient, (2) a ‘global’ multi-scale correlation, and (3) local geographically weighted correlation. These methods were applied to topographic and vegetation indices in a small catchment in Honduras that is representative of the country's hillsides agro-ecosystem which suffers from severe environmental degradation due to land-use decisions that lead to deforestation, overgrazing, and unsustainable agricultural. If the geographical scale at which topography matters for land-use allocation can be determined, then integration of knowledge systems can be focused. Our preliminary results show that: (1) single-scale correlations do not adequately represent the relationship between NDVI and topographic indices; (2) peaks in the global multi-scale correlations in agricultural areas coincided with the median farm size, but there was no evidence of any community or larger-scale land-use planning or optimization; and (3) local multi-scale correlations varied considerably from the global results at all scales, and these variations have a strong spatial structure which may indicate local optimization of land use. Copyright Taylor & Francis Numéro de notice : A2007-030 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810600852263 En ligne : https://doi.org/10.1080/13658810600852263 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28396 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Exact cell decomposition on base map features for optimal path finding / L.S. Pun-Cheng in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 175 - 185 Titre : Exact cell decomposition on base map features for optimal path finding Type de document : Article/Communication Auteurs : L.S. Pun-Cheng, Auteur ; M.Y. Tanghe, Auteur ; I.K.L. Cheung, Auteur Année de publication : 2007 Article en page(s) : pp 175 - 185 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] arc [Termes IGN] itinéraire [Termes IGN] modèle de représentation des données [Termes IGN] navigation pédestre [Termes IGN] noeud [Termes IGN] recherche du chemin optimal, algorithme de [Termes IGN] théorie des graphes Résumé : (Auteur) Path-finding problems have attracted widespread research interest in GIS-T. Previous research has largely been conducted on developing shortest path algorithms in GIS. The conventional approach is to adopt the arc-node network model, which allows only users with expert knowledge to generate measurements such as optimal paths from a map. However, the generation and maintenance of a centreline network are difficult and tedious because these are not natural on-ground features but imaginary lines on a map. To remedy the situation, a revolutionary approach has been suggested that path-finding method is independent of extra arc-node data creations by end-users. By using the cell-decomposition method borrowed from motion planning of a robot, general map users may obtain an optimal path by just identifying familiarized symbols/outlines from a digital topographic map without resorting to generating an extra set of centrelines. Copyright Taylor & Francis Numéro de notice : A2007-031 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600852206 En ligne : https://doi.org/10.1080/13658810600852206 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28397 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

DEM resolution dependencies of terrain attributes across a landscape / Y. Deng in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 187 - 213 Titre : DEM resolution dependencies of terrain attributes across a landscape Type de document : Article/Communication Auteurs : Y. Deng, Auteur ; B.O. Bauers, Auteur ; J.P. Wilson, Auteur Année de publication : 2007 Article en page(s) : pp 187 - 213 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse de groupement [Termes IGN] attribut géomètrique [Termes IGN] classification non dirigée [Termes IGN] corrélation [Termes IGN] échantillonnage d'image [Termes IGN] limite de résolution géométrique [Termes IGN] modèle numérique de surface [Termes IGN] régression [Termes IGN] relief Résumé : (Auteur) This paper documents resolution dependencies in terrain analysis and describes how they vary across landform location. Six terrain attributes were evaluated as a function of DEM resolution—slope, plan curvature, profile curvature, north–south slope orientation, east–west slope orientation, and topographic wetness index. The research highlights the effect of varying spatial resolution through a spatial sampling/resampling scheme while maintaining sets of indexed sample points at various resolutions. Tested sample points therefore coincide exactly between two directly compared resolutions in terms of their location and elevation value. An unsupervised landform classification procedure based on statistical clustering algorithms was employed to define landform classes in a reproducible manner. Correlation and regression analyses identified sensitive and consistent responses for each attribute as resolution was changed, although the tested terrain attributes responded in characteristically different ways. These responses displayed distinguishable patterns among various landform classes, a conclusion that was further verified by a series of two-sample, two-tailed t-tests. Copyright Taylor & Francis Numéro de notice : A2007-032 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810600894364 En ligne : https://doi.org/10.1080/13658810600894364 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28398 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Efficient transmission of vector data over the Internet / B. Yang in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 215 - 237 Titre : Efficient transmission of vector data over the Internet Type de document : Article/Communication Auteurs : B. Yang, Auteur ; Ross S. Purves, Auteur ; Robert Weibel, Auteur Année de publication : 2007 Article en page(s) : pp 215 - 237 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Produits informatiques [Termes IGN] architecture client-serveur [Termes IGN] cohérence des données [Termes IGN] diffusion de données [Termes IGN] données vectorielles [Termes IGN] logiciel de réseau [Termes IGN] protocole IP [Termes IGN] protocole TCP [Termes IGN] qualité des données [Termes IGN] relation topologique [Termes IGN] serveur de données localisées Résumé : (Auteur) This paper proposes and implements a new methodology for progressive transmission of vector lines and polygons over the Internet. The methodology generates continuous vector data through constrained remove operations of vertices on the server side, maintains consistent topology via a set of constraint rules, and restores original vector data through a reconstruction operator on the client side. The prototype system was implemented to investigate the performance of the methodology in terms of the preservation of consistent topology, transmission time, and qualities of the resulting visualizations. The method is shown to be scalable to large data sets, to produce graphically acceptable results and to maintain topology. Copyright Taylor & Francis Numéro de notice : A2007-033 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600894281 En ligne : https://doi.org/10.1080/13658810600894281 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28399 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Assessing the effect of attribute uncertainty on the robustness of choropleth map classification / N. Xiao in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 1-2 (january 2007) . - pp 121 - 144 Titre : Assessing the effect of attribute uncertainty on the robustness of choropleth map classification Type de document : Article/Communication Auteurs : N. Xiao, Auteur ; C.A. Calder, Auteur ; Marc P. Armstrong, Auteur Année de publication : 2007 Article en page(s) : pp 121 - 144 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] attribut [Termes IGN] carte choroplèthe [Termes IGN] classification dirigée [Termes IGN] incertitude des données [Termes IGN] précision de la classification [Termes IGN] visualisation Résumé : (Auteur) Choropleth maps are often used to visualize the spatial distribution of information collected for enumeration units. Such maps, however, are normally produced without considering the effect of uncertainty associated with data, which can contribute to incorrect interpretation. The purpose of this paper is to develop a method that can be used to evaluate the classification robustness of choropleth maps when the attribute uncertainty associated with the data is known or can be estimated. We first develop a measure to indicate the robustness of classification schemes. We then design a set of experiments to examine the robustness of different choropleth map classifications under various levels and types of uncertainty. Our experiments suggest that the robustness of a choropleth classification scheme is a function of uncertainty and the number of classes used. Increases in data uncertainty will decrease map robustness. However, it is possible to increase map robustness by choosing a smaller number of classes. We also discuss a visualization approach that can be used to display the classification robustness of each enumeration unit within a choropleth map. Numéro de notice : A2007-029 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600894307 En ligne : https://doi.org/10.1080/13658810600894307 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78189 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07012	RAB	Revue	Centre de documentation	En réserve L003	Disponible