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Modelling error propagation in vector-based overlay analysis / Wei Shi in ISPRS Journal of photogrammetry and remote sensing, vol 59 n° 1-2 (August 2004 - April 2005)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 59 n° 1-2 (August 2004 - April 2005) . - pp 47 - 59 Titre : Modelling error propagation in vector-based overlay analysis Type de document : Article/Communication Auteurs : Wei Shi, Auteur ; C.K. Cheung, Auteur ; X. Tong-Tong, Auteur Année de publication : 2004 Article en page(s) : pp 47 - 59 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] données vectorielles [Termes IGN] erreur de positionnement [Termes IGN] modèle analytique [Termes IGN] modélisation [Termes IGN] noeud [Termes IGN] polygone [Termes IGN] propagation d'erreur Résumé : (Auteur) This paper proposes two methods for analyzing error propagation in overlay analysis of vector polygons, an analytical and simulation method. First, for the analytical method, the error is derived based on the error propagation law in statistics. In the second method, error propagation of overlay is simulated based on the positional error of the original polygon vertices, assuming a given error distribution of the vertices. For both methods, several geometrical error measures for the derived polygons are defined: (i) error measures for the perimeter, area and center of gravity of a polygon, and (ii) the error intervals for the polygon vertices. A test is performed to compare the differences between the two methods and their applicability. The results indicate that there is no significant difference in estimating the propagated error between the two methods. However, these two methods are suitable for different cases. The analytical method is applicable when the error ellipse of any intersection point of the original polygons does not intersect with error ellipses of all the vertices of the original polygons, if the intersection point or, in case of disjoint polygon boundaries, the error ellipse of any point on the boundary of one original polygon does not intersect with the error ellipse of any point on the boundary of the other original polygons. On the other hand, the simulation method is more generic, but more time consuming. Copyright ISPRS Numéro de notice : A2004-314 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2004.05.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2004.05.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26841 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-04031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Estimation of the positional uncertainty in line simplification in GIS / C.K. Cheung in Cartographic journal (the), vol 41 n° 1 (June 2004)  

Public [article]  inCartographic journal (the) > vol 41 n° 1 (June 2004) . - pp 37 - 45 Titre : Estimation of the positional uncertainty in line simplification in GIS Type de document : Article/Communication Auteurs : C.K. Cheung, Auteur ; Wei Shi, Auteur Année de publication : 2004 Article en page(s) : pp 37 - 45 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] estimation statistique [Termes IGN] généralisation cartographique automatisée [Termes IGN] incertitude géométrique [Termes IGN] lissage de courbe [Termes IGN] lissage de données [Termes IGN] propagation d'incertitude [Termes IGN] simplification de contour [Termes IGN] système d'information géographique [Vedettes matières IGN] Généralisation Résumé : (Auteur) This paper presents a new model for handling positional uncertainty in the process of line simplification. It considers that positional uncertainty in a simplified line is caused by (a) positional uncertainty in an initial line propagated through the process and (b) a deviation of the simplified line from the initial line. In order to describe the uncertainty in the simplified line, the maximum distance is defined as a measure. This measure is further adopted to determine parameters to a line simplification algorithm. Therefore, this model makes a step forward in the implementation of an uncertainty indicator for the line simplification. As compared existing models, the proposed uncertainty model in this paper is more comprehensive in uncertainty assessment for line simplification Numéro de notice : A2004-279 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870404225019990 En ligne : https://www.tandfonline.com/doi/abs/10.1179/000870404225019990 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26806 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-04011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A probability-based uncertainty model for point-in-polygon analysis in GIS / C.K. Cheung in Geoinformatica, vol 8 n° 1 (March - May 2004)  

Public [article]  inGeoinformatica > vol 8 n° 1 (March - May 2004) . - pp 71 - 98 Titre : A probability-based uncertainty model for point-in-polygon analysis in GIS Type de document : Article/Communication Auteurs : C.K. Cheung, Auteur ; Wei Shi, Auteur ; X. Zhou, Auteur Année de publication : 2004 Article en page(s) : pp 71 - 98 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] analyse de données [Termes IGN] incertitude géométrique [Termes IGN] modèle mathématique [Termes IGN] noeud [Termes IGN] point [Termes IGN] polygone [Termes IGN] propagation d'erreur [Termes IGN] système d'information géographique Résumé : (Auteur) In a geographical information system (GIS), a conventional point-in-polygon analysis is used to determine whether a point is located inside a polygon with a Boolean result. Due to positional uncertainties existing with both the point and the polygon, the Boolean answer cannot describe the relationship of closeness between the point and the polygon. This paper aims to develop a model and to provide a continuous index - the probability value - to indicate the extent of the uncertain point located inside the uncertain polygon based upon existing research development. This probability index is derived based on probability and statistical theories considering the statistical uncertainty distributions of the point and the polygon's vertices. The associated mathematical expressions for the probability index are addressed in cases depending on the intersection between the polygon and the error ellipse of the point. The proposed probability index can provide an objective description of the relationship of closeness between an uncertain point and an uncertain polygon. Numéro de notice : A2004-013 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1023/B:GEIN.0000007725.41038.03 En ligne : https://doi.org/10.1023/B:GEIN.0000007725.41038.03 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26541 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-04011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Modelling error propagation in vector-based buffer analysis / Wei Shi in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 3 (may 2003) . - pp 251 - 271 Titre : Modelling error propagation in vector-based buffer analysis Type de document : Article/Communication Auteurs : Wei Shi, Auteur ; C.K. Cheung, Auteur ; C. Zhu, Auteur Année de publication : 2003 Article en page(s) : pp 251 - 271 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] analyse de données [Termes IGN] analyse numérique [Termes IGN] analyse spatiale [Termes IGN] base de données localisées [Termes IGN] données vectorielles [Termes IGN] propagation d'erreur [Termes IGN] zone tampon Résumé : (Auteur) Error propagation of buffer analysis in a vectorbased geographical information system (GIS) is studied with the use of statistics and numerical analyses. In this paper, such factors as the error of commission, the error of omission, the discrepant area and the normalized discrepant area are proposed as the error indicators of buffer analysis. Analytical expressions for the error indicators are developed as multiple integrals. A numerical integration method is recommended to find an approximation to the analytical expression. Numéro de notice : A2003-045 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/1365881022000016007 En ligne : https://doi.org/10.1080/1365881022000016007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22342 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-03031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-03032	RAB	Revue	Centre de documentation	En réserve L003	Disponible