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Auteur Wei Shi |
Documents disponibles écrits par cet auteur (18)
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Modelling error propagation in vector-based buffer analysis / Wei Shi in International journal of geographical information science IJGIS, vol 17 n° 3 (may 2003)
[article]
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 tamponRésumé : (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
in International journal of geographical information science IJGIS > vol 17 n° 3 (may 2003) . - pp 251 - 271[article]Réservation
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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 Multi-band wavelet for using Spot panchromatic and multispectral images / Wei Shi in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 5 (May 2003)
[article]
Titre : Multi-band wavelet for using Spot panchromatic and multispectral images Type de document : Article/Communication Auteurs : Wei Shi, Auteur ; C. Zhu, Auteur ; Ca. Zhu, Auteur ; X. Yang, Auteur Année de publication : 2003 Article en page(s) : pp 513 - 520 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] fusion d'images
[Termes IGN] image Landsat-TM
[Termes IGN] image multibande
[Termes IGN] image panchromatique
[Termes IGN] image SPOT
[Termes IGN] ondelette
[Termes IGN] transformation en ondelettes
[Termes IGN] transformation intensité-teinte-saturationRésumé : (Auteur) With the development of remote sensing technology, fusion of remotely sensed images, such as SPOT panchromatic (SPOT P) with SPOT multispectral images (SPOT XS) or Landsat Thematic Mapper (TM), has become more important in order to obtain richer information in the spatial and spectral domains simultaneously. Many fusion methods have been developed based on the twoband wavelet transformation. However, due to the limitations of the transformation characteristics themselves, the twoband wavelet is not very efficient for the fusion of images whose ratio of spatial resolutions is not 2n (n = 1, 2, 3, ...), e.g., for fusing a 101 resolution panchromatic SPOT image and with 30m resolution multispectral TM images. However, a recently developed new wavelet branchmultiband wavelet can potentially be applied to solve this problem. In this paper, we develop a new approach for fusing SPOT P images with multispectral TM images based on multiband wavelet transformation. First, the theoretical basis of multiband wavelet is presented and its transformation properties are analyzed. Second, a new method for fusing a SPOT P image with multispectral images using the multiband wavelet is proposed. Specifically, the threeband wavelet is implemented to fuse 1 10m SPOT panchromatic and 30m multispectral TM images. Third, this new method is compared with previous methods such as the twoband wavelet and IHS methods for image fusion. The proposed multiband wavelet approach demonstrates an improvement in spatial and spectral characteristics for fusing SPOT P and multispectral TM images. Numéro de notice : A2003-082 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.5.513 En ligne : https://doi.org/10.14358/PERS.69.5.513 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22378
in Photogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 5 (May 2003) . - pp 513 - 520[article]A stochastic process-based model for the positional error of line segments in GIS / Wei Shi in International journal of geographical information science IJGIS, vol 14 n° 1 (january 2000)
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Titre : A stochastic process-based model for the positional error of line segments in GIS Type de document : Article/Communication Auteurs : Wei Shi, Auteur ; W. Liu, Auteur Année de publication : 2000 Article en page(s) : pp 51 - 66 Note générale : Bibliographie 1 page Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] données localisées
[Termes IGN] erreur de positionnement
[Termes IGN] modèle stochastique
[Termes IGN] modélisation
[Termes IGN] segment de droite
[Termes IGN] système d'information géographiqueRésumé : (Auteur) This paper presents a model for describing the positional error of line segments in geographical information systems (GIS). The model is based on stochastic process theory with the assomptions that the errors of the endpoints of a line segment follow two-dimensional normal distributions. The distribution and density fonctions of the line segments are derived statistically. The uncertainty information matrix of line segments is derived to indicate the error of an arbitrary point on the line segment. This model covers the cases where two-end points are correlated to each other and points on the line segment are stochastically continuous to each other. The model is a more generic error band model than those previously developed ans is called the G-Band model. Numéro de notice : A2000-225 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/136588100240958 En ligne : https://doi.org/10.1080/136588100240958 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21640
in International journal of geographical information science IJGIS > vol 14 n° 1 (january 2000) . - pp 51 - 66[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-00011 RAB Revue Centre de documentation En réserve L003 Disponible