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Noisy data smoothing in DEM construction using least squares support vector machines / C. Chen in Transactions in GIS, vol 18 n° 6 (December 2014)  

Public [article]  inTransactions in GIS > vol 18 n° 6 (December 2014) . - pp 896 – 910 Titre : Noisy data smoothing in DEM construction using least squares support vector machines Type de document : Article/Communication Auteurs : C. Chen, Auteur ; Y. Li, Auteur ; H. Dai, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 896 – 910 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] bruit (théorie du signal) [Termes IGN] données lidar [Termes IGN] modèle numérique du bâti [Termes IGN] séparateur à vaste marge Résumé : (Auteur) Since spatial datasets are subject to sampling errors, a smoothing interpolation method should be employed to remove noise during DEM construction. Although least squares support vector machines (LSSVM) have been widely accepted as a classifier, their effect on smoothing noisy data is almost unknown. In this article, the smoothness of LSSVM was explored, and its effect on smoothing noisy data in DEM construction was tested. In order to improve the ability to deal with large datasets, a local method of LSSVM has been developed, where only the neighboring sampling points around the one to be estimated are used for computation. A numerical test indicated that LSSVM is more accurate than the classical smoothing methods including TPS and kriging, and its error surfaces are more evenly distributed. The real-world example of smoothing noise inherent in lidar-derived DEMs also showed that LSSVM has a positive smoothing effect, which is approximately as accurate as TPS. In short, LSSVM with a high efficiency can be considered as an alternative smoothing method for smoothing noisy data in DEM construction. Numéro de notice : A2014-576 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12078 Date de publication en ligne : 26/02/2014 En ligne : https://doi.org/10.1111/tgis.12078 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74766 [article]

WebGIS performance tests / H. Dai in GIM international, vol 26 n° 1 (January 2012)

Public [article]  inGIM international > vol 26 n° 1 (January 2012) . - pp 23 - 27 Titre : WebGIS performance tests Type de document : Article/Communication Auteurs : H. Dai, Auteur ; L. Chen, Auteur ; C. Chen, Auteur Année de publication : 2012 Article en page(s) : pp 23 - 27 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] analyse comparative [Termes IGN] architecture à trois niveaux [Termes IGN] diffusion de données [Termes IGN] serveur d'application [Termes IGN] test de performance [Termes IGN] traitement réparti [Termes IGN] WebSIG Résumé : (Auteur) A webGIS is usually constructed as a multi-tiers architecture basically consisting for the client side, the server side and the database component. From the client side, users send queries or requests to the server via (wireless) internet. Next the server communicates with database, where the requested information is compiled by the database server. Finally, the result is sent to the client. With the rapid growth of WebGIS application in 2010, the authors tested the performance of two models: centralized and distributed. Numéro de notice : A2012-006 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31454 [article]

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061-2012011	RAB	Revue	Centre de documentation	En réserve L003	Disponible