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A generalized cross-tabulation matrix to compare soft-classified maps at multiple resolutions / Robert Gilmore Pontius in International journal of geographical information science IJGIS, vol 20 n° 1 (january 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 1 (january 2006) . - pp 1 - 30 Titre : A generalized cross-tabulation matrix to compare soft-classified maps at multiple resolutions Type de document : Article/Communication Auteurs : Robert Gilmore Pontius, Auteur ; L. Cheuk, Auteur Année de publication : 2006 Article en page(s) : pp 1 - 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] algèbre de Boole [Termes IGN] classification pixellaire [Termes IGN] données multiéchelles [Termes IGN] matrice [Termes IGN] numérisation [Termes IGN] système d'information géographique Résumé : (Auteur) This paper addresses two grand challenges in the development of methods for Geographic Information Science (GIS). First, this paper presents techniques to compute a cross-tabulation matrix for soft-classified pixels. Second, it shows how to compute the cross-tabulation matrix at multiple scales. The traditional approach to construct the cross-tabulation matrix uses a Boolean operator to analyse pixels that are hard-classified. For soft-classified pixels, the contemporary approach uses a Multiplication operator ; the fuzzy approach uses a Minimum operator ; whereas this paper proposes a multiple-resolution approach that uses a Composite operator. There are difficulties with the traditional, contemporary, and fuzzy methods of computing the cross-tabulation matrix. The proposed multiple-resolution method resolves those difficulties. Furthermore, the proposed method facilitates multiple-resolution analysis, so it can examine how results change as a function of scale. The paper derives the equations to compute cross-tabulation matrices at multiple resolutions and connects those equations to ontological foundations of GIS. Numéro de notice : A2006-023 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810500391024 En ligne : https://doi.org/10.1080/13658810500391024 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27750 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Fourier series and the cartographic line / G.J. Lawford in International journal of geographical information science IJGIS, vol 20 n° 1 (january 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 1 (january 2006) . - pp 31 - 52 Titre : Fourier series and the cartographic line Type de document : Article/Communication Auteurs : G.J. Lawford, Auteur Année de publication : 2006 Article en page(s) : pp 31 - 52 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] Australie [Termes IGN] données vectorielles [Termes IGN] échelle cartographique [Termes IGN] généralisation cartographique automatisée [Termes IGN] matrice [Termes IGN] reconnaissance de formes [Termes IGN] segment de droite [Termes IGN] série de Fourier [Termes IGN] simplification de contour [Termes IGN] système d'information géographique [Termes IGN] trait de côte [Termes IGN] transformation de Fourier Résumé : (Auteur) The application of Fourier Series to cartography and GIS, in particular to shape analysis, fine simplification and enhancement, and the measurement of cartographic scale, is explored. Vector representations of the Australian coastline are manipulated using Fourier techniques and the output appraised in terms of its ability to encapsulate the shape of the original coastline, or as a simplified or enhanced version of the original. Using Fourier techniques on vector representations of parts of the Australian coastline at six different cartographic scales, a relationship between cartographic scale and line complexity is found to exist, and an empirical expression of that relationship developed. The intent of developing an empirical relationship is to bring greater consistency to the process of assigning cartographic scale to data, and thereby to the process of map production, data simplification and GIS analysis. Fourier techniques are found to be a poor encapsulator of cartographic shape, a good method of line simplification and enhancement, and a promising method of measuring cartographic scale. As background, some revision of the history and mathematics of Fourier Series, and previous research into the application of Fourier Series to cartography, is given. Numéro de notice : A2006-024 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810512331319109 En ligne : https://doi.org/10.1080/13658810512331319109 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27751 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A hybrid interpolation method for the refinement of a regular grid digital elevation model / W.Z. Shi in International journal of geographical information science IJGIS, vol 20 n° 1 (january 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 1 (january 2006) . - pp 53 - 67 Titre : A hybrid interpolation method for the refinement of a regular grid digital elevation model Type de document : Article/Communication Auteurs : W.Z. Shi, Auteur ; Yuan Tian, Auteur Année de publication : 2006 Article en page(s) : pp 53 - 67 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] grille régulière [Termes IGN] interpolation linéaire [Termes IGN] interpolation non-linéaire [Termes IGN] matrice [Termes IGN] modèle numérique de surface [Termes IGN] système d'information géographique Résumé : (Auteur) A digital elevation model (DEM), which is used to represent a terrain surface. is normally constructed by applying an interpolation method on given sample elevation points. Interpolation methods can be classified into two classes: linear methods, which have a low time cost and are suitable for terrains where there is little change in elevation, and non-linear methods, which normally consume comparatively more time and are more suitable for terrains where there are frequent changes in elevation. A hybrid interpolation method, which involves both a linear method and a non-linear method of interpolation, is proposed in this paper. The proposed method aims to integrate the advantages of both linear and non-linear interpolation methods for the refinement of regular grid DEM. Here, the bilinear is identified as the linear method, and the bi-cubic is taken to be the non-linear interpolation method. The hybrid method is an integration of a linear model and non-linear interpolation model with a parameter that defines the weights for each of the models. The parameter is dependent on the complexity of the terrain, for which a DEM is to be interpolated. The experimental results in this study demonstrate that the hybrid method is effective for interpolating DEMs for various types of terrain. Numéro de notice : A2006-025 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810500286943 En ligne : https://doi.org/10.1080/13658810500286943 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27752 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A discussion on the computational limitations of outranking methods for land-use suitability assessment / O. Marinoni in International journal of geographical information science IJGIS, vol 20 n° 1 (january 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 1 (january 2006) . - pp 69 - 87 Titre : A discussion on the computational limitations of outranking methods for land-use suitability assessment Type de document : Article/Communication Auteurs : O. Marinoni, Auteur Année de publication : 2006 Article en page(s) : pp 69 - 87 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse multicritère [Termes IGN] base de données localisées [Termes IGN] données maillées [Termes IGN] itération [Termes IGN] outil d'aide à la décision [Termes IGN] système d'information géographique [Termes IGN] utilisation du sol Résumé : (Auteur) The family of outranking methods includes a set of well-known and popular decision-aid methods. Heterogeneous variables of various scales can be introduced, and data transformations are not required. But it is also recognized that these methods are subject to computational limitations with respect to the number of decision alternatives. Dealing with large raster datasets and considering every raster cell a location alternative, these methods reach their computational limits quickly. This paper discusses these computational limits and presents an iterative approach which enables a modeller to easily and transparently apply outranking methods for land-suitability assessment with practically no limit in the sizes of the raster datasets. An example using the PROMETHEE outranking approach is performed. Numéro de notice : A2006-026 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500287040 En ligne : https://doi.org/10.1080/13658810500287040 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27753 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

On the use of dimensioned measures of error to evaluate the performance of spatial interpolators / C.J. Willmot in International journal of geographical information science IJGIS, vol 20 n° 1 (january 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 1 (january 2006) . - pp 89 - 102 Titre : On the use of dimensioned measures of error to evaluate the performance of spatial interpolators Type de document : Article/Communication Auteurs : C.J. Willmot, Auteur ; K. Matsuura, Auteur Année de publication : 2006 Article en page(s) : pp 89 - 102 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] carte thématique [Termes IGN] climatologie [Termes IGN] erreur moyenne quadratique [Termes IGN] interpolation spatiale [Termes IGN] performance [Termes IGN] température au sol Résumé : (Auteur) Spatial cross-validation and average-error statistics are examined with respect to their abilities to evaluate alternate spatial interpolation methods. A simple cross-validation methodology is described, and the relative abilities of three dimensioned error statistics -the root-mean-square error (RMSE), the mean absolute error (MAE), and the mean bias error (MBE)- to describe average interpolator performance are examined. To illustrate our points, climatologically averaged weather-station temperatures were obtained from the Global Historical Climatology Network (GHCN), Version 2, and then alternately interpolated spatially (gridded) using two spatial-interpolation procedures. Substantial differences in the performance of our two spatial interpolators are evident in maps of the cross-validation error fields, in the average-error statistics, as well as in estimated land-surface-average air temperatures that differ by more than 2°C. The RMSE and its square, the mean-square error (MSE), are of particular interest, because they are the most widely reported average-error measures, and they tend to be misleading. It (RMSE) is an inappropriate measure of average error because it is a function of three characteristics of a set of errors, rather than of one (the average error). Our findings indicate that MAE and MBE are natural measures of average error and that (unlike RMSE) they are unambiguous. Numéro de notice : A2006-027 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500286976 En ligne : https://doi.org/10.1080/13658810500286976 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27754 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06012	RAB	Revue	Centre de documentation	En réserve L003	Disponible

First evidence of West Nile virus amplification and relationship to human infections / C.N. Theophilides in International journal of geographical information science IJGIS, vol 20 n° 1 (january 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 1 (january 2006) . - pp 103 - 115 Titre : First evidence of West Nile virus amplification and relationship to human infections Type de document : Article/Communication Auteurs : C.N. Theophilides, Auteur ; Sean C. Ahearn, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 103 - 115 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse diachronique [Termes IGN] analyse spatio-temporelle [Termes IGN] Aves [Termes IGN] Egypte [Termes IGN] épidémie [Termes IGN] Insecta [Termes IGN] Kappa de Cohen [Termes IGN] Nil (fleuve) Résumé : (Auteur) The spatio-temporal relationship between unusual sightings, of dead birds and human West Nile virus infections has been observed in man, studies and has been proposed as an indicator of an intense amplification cycle between birds and mosquitoes. However, to date, no single study has provided quantitative evidence that the amplification cycle occurs at the local level and that it operates within certain temporal parameters. Here, we use a novel geostatistical and spatial analytic methodology and present the first evidence that the localized unusual space-time correspondence of dead birds models the amplification cycle and that this cycle peaks 15-16 days prior to human onset of West Nile virus infections. During the process of establishing this relationship, we extend the traditional Knox space-time interaction measure to overcome pair-dependency, limitations and use a novel implementation of the kappa non-chance agreement measure to identify the temporal characteristics of the association of bird deaths to human West Nile infections. Numéro de notice : A2006-028 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500286968 En ligne : https://doi.org/10.1080/13658810500286968 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27755 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06012	RAB	Revue	Centre de documentation	En réserve L003	Disponible