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Exemplaires(2)
| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 079-08051 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
| 079-08052 | RAB | Revue | Centre de documentation | En réserve L003 | Disponible |
Dépouillements
Ajouter le résultat dans votre panierCartographic generalisation of lines based on a B-spline snake model / E. Guilbert in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)
Titre : Cartographic generalisation of lines based on a B-spline snake model Type de document : Article/Communication Auteurs : E. Guilbert, Auteur ; Eric Saux, Auteur Année de publication : 2008 Article en page(s) : pp 847 - 870 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] algorithme snake
[Termes IGN] fonction spline
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] lissage de courbe
[Termes IGN] navigation maritime
[Termes IGN] objet géographique linéaire
[Termes IGN] simplification de contour
[Termes IGN] système d'information géographique
[Termes IGN] visualisation
[Vedettes matières IGN] GénéralisationRésumé : (Auteur) The automation of cartographic map production is still an important research field in Geographical Information Systems (GIS). With the increasing development of monitoring and decision-aid systems either on computer networks or wireless networks, efficient methods are needed to visualise geographical data while respecting some application constraints (accuracy, legibility, security, etc.). This paper introduces a B-spline snake model to deal with the current operators involved in the cartographic generalisation process of lines. This model enables us to perform those operators with a continuous approach. In order to avoid local conflicts such as intersections or self-intersections, the consistency of the lines is checked and discrete operations such as segment removal are performed during the process. We apply the method to map production in the highly constrained domain of maritime navigation systems. Experimental results of marine chart generalisation yield some discussions about generalisation robustness and quality. Copyright Taylor & Francis Numéro de notice : A2008-305 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701689846 En ligne : https://doi.org/10.1080/13658810701689846 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29298
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 847 - 870[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Image-based quality assessment of road databases Type de document : Article/Communication Auteurs : Markus Gerke, Auteur ; Christian Heipke, Auteur Année de publication : 2008 Article en page(s) : pp 871 - 894 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] analyse de sensibilité
[Termes IGN] base de données routières
[Termes IGN] connexité (graphes)
[Termes IGN] évaluation des données
[Termes IGN] graphe
[Termes IGN] mise à jour de base de données
[Termes IGN] modèle sémantique de données
[Termes IGN] qualité des données
[Termes IGN] raisonnement spatial
[Termes IGN] relation topologique
[Termes IGN] traitement d'imageRésumé : (Auteur) In this paper, an approach to the automatic quality assessment of existing geo-spatial data is presented. The necessary reference information is derived automatically from up-to-date digital remotely sensed images using image analysis methods. The focus is on the quality assessment of roads as these are among the most frequently changing objects in the landscape. In contrast to existing approaches for quality control of road data, the data to be assessed and the objects extracted from the images are modelled and processed together. A geometric-topologic relationship model for the roads and their surroundings is defined. Context objects such as rows of trees support the quality assessment of road vector data as they may explain gaps in road extraction. The extraction and explicit incorporation of these objects in the assessment of a given road database give stronger support for or against its correctness. During the assessment existing relations between road objects from the database and extracted objects are compared to the modelled relations. The certainty measures of the objects are integrated into this comparison. Normally, more than one extracted object gives evidence for a road database object; therefore, a reasoning algorithm which combines evidence given by the extracted objects is used. If the majority of the total evidence argues for the database object and if a certain amount of this database object is covered by extracted objects, the database object is assumed to be correct, i.e. it is accepted, otherwise it is rejected. The procedure is embedded into a two-stage graph-based approach which exploits the connectivity of roads and results in a reduction of false alarms. The algorithms may be incorporated into a semi-automatic environment, where a human operator only checks those objects that have been rejected. The experimental results confirm the importance of the employed advanced statistical modelling. The overall approach can reliably assess the roads from the given database, using road and context objects which have been automatically extracted from remotely sensed imagery. Sensitivity analysis shows that in most cases the chosen two-stage graph-approach reduces the number of false decisions. Approximately 66% of the road objects have been accepted by the developed approach in an extended test area, 1% has been accepted though incorrect. Those false decisions are mainly related to the lack of modelling road junction areas. Copyright Taylor & Francis Numéro de notice : A2008-306 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701703258 En ligne : https://doi.org/10.1080/13658810701703258 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29299
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 871 - 894[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : SRTM resample with short distance-low nugget kriging Type de document : Article/Communication Auteurs : C.H. Grohmann, Auteur ; S.S. Steiner, Auteur Année de publication : 2008 Article en page(s) : pp 895 - 806 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] géostatistique
[Termes IGN] image radar moirée
[Termes IGN] image SRTM
[Termes IGN] interpolation
[Termes IGN] interpolation inversement proportionnelle à la distance
[Termes IGN] krigeage
[Termes IGN] MNS SRTM
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] radargrammétrie
[Termes IGN] rééchantillonnage
[Termes IGN] variogrammeRésumé : (Auteur) The shuttle radar topography mission (SRTM), was flow on the space shuttle Endeavour in February 2000, with the objective of acquiring a digital elevation model of all land between 60° north latitude and 56° south latitude, using interferometric synthetic aperture radar (InSAR) techniques. The SRTM data are distributed at horizontal resolution of 1 arc-second (?30 m) for areas within the USA and at 3 arc-second (?90 m) resolution for the rest of the world. A resolution of 90 m can be considered suitable for the small or medium-scale analysis, but it is too coarse for more detailed purposes. One alternative is to interpolate the SRTM data at a finer resolution; it will not increase the level of detail of the original digital elevation model (DEM), but it will lead to a surface where there is the coherence of angular properties (i.e. slope, aspect) between neighbouring pixels, which is an important characteristic when dealing with terrain analysis. This work intents to show how the proper adjustment of variogram and kriging parameters, namely the nugget effect and the maximum distance within which values are used in interpolation, can be set to achieve quality results on resampling SRTM data from 3” to 1”. We present for a test area in western USA, which includes different adjustment schemes (changes in nugget effect value and in the interpolation radius) and comparisons with the original 1” model of the area, with the national elevation dataset (NED) DEMs, and with other interpolation methods (splines and inverse distance weighted (IDW)). The basic concepts for using kriging to resample terrain data are: (i) working only with the immediate neighbourhood of the predicted point, due to the high spatial correlation of the topographic surface and omnidirectional behaviour of variogram in short distances; (ii) adding a very small random variation to the coordinates of the points prior to interpolation, to avoid punctual artifacts generated by predicted points with the same location than original data points and; (iii) using a small value of nugget effect, to avoid smoothing that can obliterate terrain features. Drainages derived from the surfaces interpolated by kriging and by splines have a good agreement with streams derived from the 1” NED, with correct identification of watersheds, even though a few differences occur in the positions of some rivers in flat areas. Although the 1” surfaces resampled by kriging and splines are very similar, we consider the results produced by kriging as superior, since the spline-interpolated surface still presented some noise and linear artifacts, which were removed by kriging. Copyright Taylor & Francis Numéro de notice : A2008-307 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 13658810701730152 En ligne : https://doi.org/10.1080/13658810701730152 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29300
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 895 - 806[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : 3D noise mapping in urban areas Type de document : Article/Communication Auteurs : Jantien E. Stoter, Auteur ; H., De Kluijver, Auteur ; V. Kurakulas, Auteur Année de publication : 2008 Article en page(s) : pp 907 - 924 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] bruit (audition)
[Termes IGN] cartographie du bruit
[Termes IGN] données localisées 3D
[Termes IGN] impact sur l'environnement
[Termes IGN] milieu urbain
[Termes IGN] modélisation spatialeRésumé : (Auteur) Noise mapping is the process of determining and visualizing noise impact on the environment in order to support environmental policies. Currently most noise impact studies are based on a 2D approach. The 3D output of noise simulation software is processed and visualized in 2D and combined with 2D topographical and other data, such as population distribution, to quantify the effects. The research described in this paper aims at improving visualization and assessment of noise impact on the environment by generating a 3D noise map in cases where 3D effects are relevant. Based on the specific demand, an approach is presented to generate a 3D noise map as a basis for noise impact studies. The proposed concept is proofed by applying it to a sample noise impact study. From experiences with the sample, it can be concluded that the 3D noise map offers significant insight in situations where 3D noise effects are relevant, i.e. in urban areas. Here, current 2D noise maps have limitations. In addition, more accurate assessment of noise impact is possible in particular when different floors of a building close to the noise source and/or behind noise barriers are considered. This paper also elaborates on accuracy aspects in all phases of noise modelling, including a presentation of initial experiments of 3D noise interpolation. Copyright Taylor & Francis Numéro de notice : A2008-308 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810701739039 En ligne : https://doi.org/10.1080/13658810701739039 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29301
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 907 - 924[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Effects of DEM resolution and source on soil erosion modelling: a case study using the WEPP model Type de document : Article/Communication Auteurs : J.X. Zhang, Auteur ; K.T. Chang, Auteur ; J. Qiong, Auteur Année de publication : 2008 Article en page(s) : pp 925 - 942 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] bassin hydrographique
[Termes IGN] bassin sédimentaire
[Termes IGN] érosion hydrique
[Termes IGN] Idaho (Etats-Unis)
[Termes IGN] limite de résolution géométrique
[Termes IGN] modèle de simulation
[Termes IGN] modèle numérique de surface
[Termes IGN] pente
[Termes IGN] précision des données
[Termes IGN] prévention des risques
[Termes IGN] réseau hydrographique
[Termes IGN] ruissellementRésumé : (Auteur) Digital elevation models (DEMs) vary in resolution and accuracy by the production method. DEMs with different resolutions and accuracies can generate varied topographic and hydrological features, which can in turn affect predictions by soil erosion models, such as the WEPP (Water Erosion Prediction Project) model. This study investigates the effects of DEMs on deriving topographic and hydrological attributes, and on predicting watershed erosion using WEPP v2006.5. Six DEMs at three resolutions from three sources were prepared for two small forested watersheds located in northern Idaho, USA. These DEMs were used to calculate topographic and hydrological parameters that served as inputs to WEPP. The model results of sediment yields and runoffs were compared with field observations. For both watersheds, DEMs with different resolutions and sources generated varied watershed shapes and structures, which in turn led to different extracted hill slope and channel lengths and gradients, and produced substantially different erosion predictions by WEPP. Copyright Taylor & Francis Numéro de notice : A2008-309 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810701776817 En ligne : https://doi.org/10.1080/13658810701776817 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29302
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 925 - 942[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Using neural networks and cellular automata for modelling intra-urban land-use dynamics Type de document : Article/Communication Auteurs : C.M. Almeida, Auteur ; J.M. Gleriani, Auteur ; E.F. Castejon, Auteur ; B.S. Soares-Filho, Auteur Année de publication : 2008 Article en page(s) : pp 943 - 963 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse diachronique
[Termes IGN] automate cellulaire
[Termes IGN] milieu urbain
[Termes IGN] modèle de simulation
[Termes IGN] planification urbaine
[Termes IGN] réseau neuronal artificiel
[Termes IGN] Sao Paulo
[Termes IGN] utilisation du sol
[Termes IGN] villeRésumé : (Auteur) Empirical models designed to simulate and predict urban land-use change in real situations are generally based on the utilization of statistical techniques to compute the land-use change probabilities. In contrast to these methods, artificial neural networks arise as an alternative to assess such probabilities by means of non-parametric approaches. This work introduces a simulation experiment on intra-urban land-use change in which a supervised back-propagation neural network has been employed in the parameterization of several biophysical and infrastructure variables considered in the simulation model. The spatial land-use transition probabilities estimated thereof feed a cellular automaton (CA) simulation model, based on stochastic transition rules. The model has been tested in a medium-sized town in the Midwest of Sao Paulo State, Piracicaba. A series of simulation outputs for the case study town in the period 1985-1999 were generated, and statistical validation tests were then conducted for the best results, based on fuzzy similarity measures. Copyright Taylor & Francis Numéro de notice : A2008-310 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701731168 En ligne : https://doi.org/10.1080/13658810701731168 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29303
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 943 - 963[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Generalized network Voronoi diagrams: concepts, computational methods, and applications Type de document : Article/Communication Auteurs : Atsuyuki Okabe, Auteur ; T. Satoh, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 965 - 994 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] diagramme de Voronoï
[Termes IGN] distance euclidienne
[Termes IGN] distance pondérée
[Termes IGN] graphe planaire
[Termes IGN] milieu urbain
[Termes IGN] plus proche voisin, algorithme du
[Termes IGN] polygone
[Termes IGN] polyligne
[Termes IGN] système d'information géographiqueRésumé : (Auteur) In the real world, there are many phenomena that occur on a network or alongside a network; for example, traffic accidents on highways and retail stores along streets in an urbanized area. In the literature, these phenomena are analysed under the assumption that distance is measured with Euclidean distance on a plane. This paper first examines this assumption and shows an empirical finding that Euclidean distance is significantly different from the shortest path distance in an urbanized area if the distance is less than 500 m. This implies that service areas in urbanized areas cannot be well represented by Voronoi diagrams defined on a plane with Euclidean distance, termed generalized planar Voronoi diagrams. To overcome this limitation, second, this paper formulates six types of Voronoi diagrams defined on a network, termed generalized network Voronoi diagrams, whose generators are given by points, sets of points, lines and polygons embedded in a network, and whose distances are given by inward/outward distances, and additively/multiplicatively weighted shortest path distances. Third, in comparison with the generalized planar Voronoi diagrams, the paper empirically shows that the generalized network Voronoi diagrams can more precisely represent the service areas in urbanized areas than the corresponding planar Voronoi diagrams. Fourth, because the computational methods for constructing the generalized planar Voronoi diagrams in the literature cannot be applied to constructing the generalized network Voronoi diagrams, the paper provides newly developed efficient algorithms using the 'extended' shortest path trees. Last, the paper develops user-friendly tools (that are included in SANET, a toolbox for spatial analysis on a network) for executing these computational methods in a GIS environment. Copyright Taylor & Francis Numéro de notice : A2008-311 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701587891 En ligne : https://doi.org/10.1080/13658810701587891 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29304
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 965 - 994[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Earthquake-induced landslide hazard monitoring and assessment using SOM and PROMETHEE techniques: a case study at the Chiufenershan area in Central Taiwan Type de document : Article/Communication Auteurs : W.T. Lin, Auteur Année de publication : 2008 Article en page(s) : pp 995 - 1012 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] carte de Kohonen
[Termes IGN] cindynique
[Termes IGN] effondrement de terrain
[Termes IGN] image multitemporelle
[Termes IGN] image SPOT
[Termes IGN] outil d'aide à la décision
[Termes IGN] planification urbaine
[Termes IGN] risque naturel
[Termes IGN] séisme
[Termes IGN] surveillance géologique
[Termes IGN] TaïwanRésumé : (Auteur) Monitoring and assessment of landslide hazard is an important task for decision making and policy planning in the landslide area. Massive landslides, caused by the catastrophic Chi-Chi earthquake in 1999, occurred in Central Taiwan, especially at Chiufenershan area in Nantou county. This study proposed two useful indicators coupled with the Self-organizing map (SOM) neural network and the Preference Ranking Organization METHod for Enrichment Evaluations (PROMETHEE) technique to quickly extract accurate post-quake landslides from multi-temporal Systeme Probatoire de l'Observation de la Terre (SPOT) images. A GIS-based system was developed to simplify and integrate the procedures such as image pre-processing, the SOM training, the PROMETHEE calculation, landslide extraction and accuracy assessment. The evaluated result shows that the landslide area soon after the earthquake is 209.50 ha (Kappa coefficient 96.88%). Over seven years of vegetation recovery, the denudation area has declined to 112.64 ha (Kappa coefficient 90.64%). Most earthquake-induced landslides could be restored by natural vegetation succession. The developed system is a useful decision-making tool for landslide area planning. Copyright Taylor & Francis Numéro de notice : A2008-312 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810801914458 En ligne : https://doi.org/10.1080/13658810801914458 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29305
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 995 - 1012[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Exploring spatial data uncertainties in land-use change scenarios Type de document : Article/Communication Auteurs : N. Dendoncker, Auteur ; C. Schmit, Auteur ; M. Rounsevell, Auteur Année de publication : 2008 Article en page(s) : pp 1013 - 1030 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] agrégation spatiale
[Termes IGN] carte d'occupation du sol
[Termes IGN] changement d'utilisation du sol
[Termes IGN] données localisées
[Termes IGN] incertitude des données
[Termes IGN] limite de résolution géométrique
[Termes IGN] Luxembourg
[Termes IGN] planification
[Termes IGN] rastérisation
[Termes IGN] simulationRésumé : (Auteur) This paper evaluates errors and uncertainties in representing landscapes that arise from different data rasterization methods, spatial resolutions, and downscaled land-use change (LUC) scenarios. A vector LU dataset for Luxembourg (minimum mapping unit: 0.15 ha; year 2000) was used as the baseline reference map. This map was rasterized at three spatial resolutions using three cell class assignment methods. The landscape composition and configuration of these maps were compared. Four alternative scenarios of future LUC were also generated for the three resolutions using existing LUC scenarios and a statistical downscaling method creating 37 maps of LUC for the year 2050. These maps were compared in terms of composition and spatial configuration using simple metrics of landscape fragmentation and an analysis of variance (ANOVA). Differences in landscape composition and configuration between the three cell class assignment methods and the three spatial resolutions were found to be at least as large as the differences between the LUC scenarios. This occurred in spite of the large LUC projected by the scenarios. This demonstrates the importance of the rasterization method and the level of aggregation as a contribution to uncertainty when developing future LUC scenarios and in analysing landscape structure in ecological studies. Numéro de notice : A2008-313 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701812836 En ligne : https://doi.org/10.1080/13658810701812836 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29306
in International journal of geographical information science IJGIS > vol 22 n° 8-9 (august 2008) . - pp 1013 - 1030[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-08051 RAB Revue Centre de documentation En réserve L003 Disponible 079-08052 RAB Revue Centre de documentation En réserve L003 Disponible
