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Geometric variability of raster cell class assignment / A.M. Shortridge in International journal of geographical information science IJGIS, vol 18 n° 6 (october 2004)
[article]
Titre : Geometric variability of raster cell class assignment Type de document : Article/Communication Auteurs : A.M. Shortridge, Auteur Année de publication : 2004 Article en page(s) : pp 539 - 558 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] classification
[Termes IGN] données maillées
[Termes IGN] données vectorielles
[Termes IGN] grille
[Termes IGN] limite de résolution géométrique
[Termes IGN] maille carrée
[Termes IGN] pixel
[Termes IGN] polygone
[Termes IGN] rastérisation
[Termes IGN] simulationRésumé : (Auteur) Applications like land-cover mapping frequently require the transformation of vector polygons to raster grids, such that each cell in the output raster is assigned a single class. Cell value assignment is a direct function of the geometric relationship between the vector polygons and the origin, orientation and spatial resolution of the raster structure, acting in conjunction with the value assignment rule employed by the algorithm. Results of an alternative approach to characterizing origin assignment variability are reported. A simulation approach is employed to perturb the origin of the grid lattice by amounts smaller than the grid spacing. The distribution of results across all output raster realizations indicates the rasterization variability for a particular input vector map at a particular cell size. Results for a representative vector land-cover dataset are presented, indicating that substantial variability is possible. The paper concludes with a discussion of theoretical and practical implications for the identification of appropriate cell resolutions, as well as for identifying particular input shapes and polygon configurations that may be especially sensitive to rasterization error. Numéro de notice : A2004-349 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810410001702012 En ligne : https://doi.org/10.1080/13658810410001702012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26876
in International journal of geographical information science IJGIS > vol 18 n° 6 (october 2004) . - pp 539 - 558[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-04061 RAB Revue Centre de documentation En réserve L003 Disponible 079-04062 RAB Revue Centre de documentation En réserve L003 Disponible Spatial variability in classification accuracy of agricultural crops in the Dutch national land-cover database / A.J.W. Van Oort in International journal of geographical information science IJGIS, vol 18 n° 6 (october 2004)
[article]
Titre : Spatial variability in classification accuracy of agricultural crops in the Dutch national land-cover database Type de document : Article/Communication Auteurs : A.J.W. Van Oort, Auteur ; Arnold K. Bregt, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 611 - 626 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] base de données d'occupation du sol
[Termes IGN] base de données localisées
[Termes IGN] classe d'objets
[Termes IGN] cultures
[Termes IGN] données maillées
[Termes IGN] occupation du sol
[Termes IGN] Pays-Bas
[Termes IGN] paysage
[Termes IGN] pixel
[Termes IGN] précision de la classificationRésumé : (Auteur) Variability in per cell classification accuracy is predominantly modelled with landcover class as the explanatory variable, i.e. with users' accuracies from the error matrix. Logistic regression models were developed to include other explanatory variables: heterogeneity in the 3 x 3 window around a cell, the size of the patch and the complexity of the landscape in which a cell is located. It was found that per cell, the probability of correct classification was significantly (a = 0.05) higher for cells with a less heterogeneous neighbourhood, for cells part of larger patches and for cells in regions with a less heterogeneous landscape. To validate the models, a leave-one-out procedure was applied in which the absolute difference between the actual and the model-estimated number of cells correctly classified was summarized over 55 regions in the Netherlands. The sum of differences reduced from 60.9 to 48.1 after adding the variables 'patch size' and 'landscape dominance' to the land-cover class model. Spatial variability thus modelled therefore led to a substantial improvement in the estimation of the per cell classification accuracy. Numéro de notice : A2004-353 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810410001701969 En ligne : https://doi.org/10.1080/13658810410001701969 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26880
in International journal of geographical information science IJGIS > vol 18 n° 6 (october 2004) . - pp 611 - 626[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-04061 RAB Revue Centre de documentation En réserve L003 Disponible 079-04062 RAB Revue Centre de documentation En réserve L003 Disponible Mapping wildfire occurrence at regional scale / J. De La Riva in Remote sensing of environment, vol 92 n° 3 (30 August 2004)
[article]
Titre : Mapping wildfire occurrence at regional scale Type de document : Article/Communication Auteurs : J. De La Riva, Auteur ; F. Perez-Cabello, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 363 - 369 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse diachronique
[Termes IGN] cartographie automatique
[Termes IGN] données maillées
[Termes IGN] estimation par noyau
[Termes IGN] incendie de forêt
[Termes IGN] interpolation
[Termes IGN] reconnaissance de surfaceRésumé : (Auteur) When assessing fire danger, interpolation of the dependent variable-historic fire occurrence-is required in order to statistically compare and analyze it with human factors, environmental parameters and census statistics. To confirm the compatibility between the distinct data types, occasionally, for this kind of spatial analysis, historical observations of the primary wildland fire (given as x and y coordinates) must be transformed either to continuous surfaces or to area data. The simple overlay approach converts single point observations to area data. However, this procedure assumes lack of spatial uncertainties that would otherwise result in serious errors caused by the positional inaccuracies of the original point observations.
Here, we used kernel density interpolation to convert the original data on wildland fire ignition into an expression of areal units, defined by a raster grid and, subsequently, by the administrative borders of the municipalities in two study areas in Spain. By overlaying a normal bivariate probability density function (kernel) over each point observation, each ignition point was considered an uncertain point location rather than an exact one.Numéro de notice : A2004-385 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.06.022 En ligne : https://doi.org/10.1016/j.rse.2004.06.022 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26912
in Remote sensing of environment > vol 92 n° 3 (30 August 2004) . - pp 363 - 369[article]Landsat urban mapping based on a combined spectral-spatial methodology / B. Guindon in Remote sensing of environment, vol 92 n° 2 (15/08/2004)
[article]
Titre : Landsat urban mapping based on a combined spectral-spatial methodology Type de document : Article/Communication Auteurs : B. Guindon, Auteur ; Y. Zhang, Auteur ; C. Dillabaugh, Auteur Année de publication : 2004 Article en page(s) : pp 218 - 232 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Calgary
[Termes IGN] cartographie urbaine
[Termes IGN] classification
[Termes IGN] données maillées
[Termes IGN] données vectorielles
[Termes IGN] fusion d'images
[Termes IGN] identification automatique
[Termes IGN] image Landsat-TM
[Termes IGN] milieu urbain
[Termes IGN] occupation du sol
[Termes IGN] Ontario (Canada)
[Termes IGN] Ottawa
[Termes IGN] pixel
[Termes IGN] utilisation du solRésumé : (Auteur) Urban mapping using Landsat Thematic Mapper (TM) imagery presents numerous challenges. These include spectral mixing of diverse land cover components within pixels, spectral confusion with other land cover features such as fallow agricultural fields and the fact that urban classes of interest are of the land use and not the land cover category. A new methodology to address these issues is proposed. This approach involves, as a first step, the generation of two independent but rudimentary land cover products, one spectral-based at the pixel level and the other segment-based. These classifications are then merged through a rule-based approach to generate a final product with enhanced land use classes and accuracy. A comprehensive evaluation of derived products of Ottawa, Calgary and cities in southwestern Ontario is presented based on conventional ground reference data as well as inter-classification consistency analyses. Producer accuracies of 78% and 73% have been achieved for urban 'residential' and 'commercial/industrial' classes. respectively. The capability of Landsat TM to detect low density residential areas is assessed based on dwelling and population data derived from aerial photography and the 2001 Canadian census. For low population densities (i.e. below 3000 persons/km2), density is observed to be monotonically related to the fraction of pixels labeled 'residential'. At higher densities, the fraction of pixels labeled 'residential' remains constant due to Landsat's inability to distinguish between high-rise apartment dwellings and commercial/industrial structures. Numéro de notice : A2004-335 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.06.015 En ligne : https://doi.org/10.1016/j.rse.2004.06.015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26862
in Remote sensing of environment > vol 92 n° 2 (15/08/2004) . - pp 218 - 232[article]A global kinetic spatial data structure for a marine simulation / Mir Abolfazl Mostafavi in International journal of geographical information science IJGIS, vol 18 n° 3 (april - may 2004)
[article]
Titre : A global kinetic spatial data structure for a marine simulation Type de document : Article/Communication Auteurs : Mir Abolfazl Mostafavi, Auteur Année de publication : 2004 Article en page(s) : pp 211 - 227 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] circulation océanique
[Termes IGN] courant marin
[Termes IGN] diagramme de Voronoï
[Termes IGN] données localisées dynamiques
[Termes IGN] données maillées
[Termes IGN] littoral
[Termes IGN] modèle conceptuel de données localisées
[Termes IGN] relation topologique
[Termes IGN] simulation
[Termes IGN] simulation dynamique
[Termes IGN] structure de données localisées
[Termes IGN] triangulation de DelaunayRésumé : (Auteur) This paper proposes a new Free-Lagrange method based on the kinetic Voronoi diagram for fluid simulation. The objective here is to combine the advantages of an adoptive mesh structure with the advantages of kinetic mesh maintenance, and demonstrate their value for dynamic simulation. Despite the theoretical advantages of the Free-Lagrange method, its use has been handicapped with the reconstruction of topology after each time step that considerably reduces the efficiency of the method. In addition, the use of fixed time steps causes problems such as overshoots and undetected collisions. In order to demonstrate the ability of the proposed model to solve these problems, the method is applied to a dam-breaking problem and global tides. With the results obtained from these numerical experiments, the validity of the global kinetic data structure is approved. In particular, the method is found to be more efficient than existing methods. In addition, qualitative comparison of physical results with analytical solutions demonstrates the similarity of the results and confirms the physical validity of the proposed method. Further investigations with real-world data and the complete equation of motion are suggested to compare it with other numerical methods. Numéro de notice : A2004-158 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810310001620942 En ligne : https://doi.org/10.1080/13658810310001620942 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26685
in International journal of geographical information science IJGIS > vol 18 n° 3 (april - may 2004) . - pp 211 - 227[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-04031 RAB Revue Centre de documentation En réserve L003 Disponible 079-04032 RAB Revue Centre de documentation En réserve L003 Disponible Using quadtree segmentation to support error modelling in categorical raster data / S. De Bruin in International journal of geographical information science IJGIS, vol 18 n° 2 (march 2004)PermalinkQualité des eaux superficielles et assolement dans le bassin versant du Madon (Lorraine) / F. Masutti (2004)PermalinkA comparison of vector and raster GIS methods for calculating landscape metrics used in environmental assessments / T.G. Wade in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 12 (December 2003)PermalinkScale-independent land-use allocation modeling in raster GIS / R.G. Cromley in Cartography and Geographic Information Science, vol 30 n° 4 (October 2003)PermalinkEfficient estimation of qualitative topological relations based on the weighted walkthroughs model / S. Cicerone in Geoinformatica, vol 7 n° 3 (September - November 2003)PermalinkFuzzy 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)PermalinkA comparative analysis of scanned maps and imagery for mapping applications / Costas Armenakis in ISPRS Journal of photogrammetry and remote sensing, vol 57 n° 5-6 (April - May 2003)PermalinkInteractive maps for visual exploration of grid and vector geodata / Gennady Andrienko in ISPRS Journal of photogrammetry and remote sensing, vol 57 n° 5-6 (April - May 2003)PermalinkLe raster : une source d'informations de mieux en mieux exploitée ? / Françoise de Blomac in SIG la lettre, n° 45 (mars 2003)PermalinkPermalink