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Mapping nighttime flood from MODIS observations using support vector machines / R. Zhang in Photogrammetric Engineering & Remote Sensing, PERS, vol 78 n° 11 (November 2012)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 78 n° 11 (November 2012) . - pp 1151 - 1161 Titre : Mapping nighttime flood from MODIS observations using support vector machines Type de document : Article/Communication Auteurs : R. Zhang, Auteur ; D. Sun, Auteur ; Y. Yu, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 1151 - 1161 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] classification par séparateurs à vaste marge [Termes IGN] détection de changement [Termes IGN] image Terra-MODIS [Termes IGN] inondation [Termes IGN] nuit [Termes IGN] température de luminance [Termes IGN] zone sinistrée Résumé : (Auteur) This work proposes a nighttime flood mapping method for Moderate Resolution Imaging Spectroradiometer (modis) data. Brightness temperatures at 3.9 um, and BT11 um channels (BT 3.9, and BT 11, respectively) and differences of brightness temperatures between 3.9 um and 4.0 um, and between 11 um and 12 um (BT 3.9-BT 4.0, and BT 11- BT 12, respectively) are used to identify nighttime water pixels by a support vector machines (SVM) classifier. Prominent flood locations are detected by a change detection process using a reference water-land map. To test the effectiveness of the proposed method, two flood cases caused by heavy rains were chosen as trial scenarios. The nighttime mapping results are validated with the flood maps, which are obtained from the visual interpretation based on the daytime flood identification results. The experimental results indicate that the proposed method is effective for the delineation of inundated areas with standing water during the nighttime. Numéro de notice : A2012-583 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.78.11.1151 En ligne : https://doi.org/10.14358/PERS.78.11.1151 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32029 [article]

Indexing fast moving objects for kNN queries based on nearest landmarks / D. Lin in Geoinformatica, vol 10 n° 4 (December 2006)  

Public [article]  inGeoinformatica > vol 10 n° 4 (December 2006) . - pp 423 - 445 Titre : Indexing fast moving objects for kNN queries based on nearest landmarks Type de document : Article/Communication Auteurs : D. Lin, Auteur ; R. Zhang, Auteur ; A. Zhou, Auteur Année de publication : 2006 Article en page(s) : pp 423 - 445 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] arbre (mathématique) [Termes IGN] classification barycentrique [Termes IGN] index spatial [Termes IGN] mise à jour de base de données [Termes IGN] objet mobile [Termes IGN] point de repère [Termes IGN] requête spatiale Résumé : (Auteur) With the rapid advancements in positioning technologies such as the Global Positioning System (GPS) and wireless communications, the tracking of continuously moving objects has become more convenient. However, this development poses new challenges to database technology since maintaining up-to-date information regarding the location of moving objects incurs an enormous amount of updates. Existing indexes can no longer keep up with the high update rate while providing speedy retrieval at the same time. This study aims to improve k nearest neighbor (kNN) query performance while reducing update costs. Our approach is based on an important observation that queries usually occur around certain places or spatial landmarks of interest, called reference points. We propose the Reference-Point-based tree (RP-tree), which is a two-layer index structure that indexes moving objects according to reference points. Experimental results show that the RP-tree achieves significant improvement over the TPR-tree. Copyright Springer Numéro de notice : A2006-546 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-0341-9 En ligne : https://doi.org/10.1007/s10707-006-0341-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28269 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-06041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A proposed approach to determine the infrared emissivities of terrestrial surfaces from airborne or spaceborne platforms / R. Zhang in International Journal of Remote Sensing IJRS, vol 9 n° 3 (May 1988)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 9 n° 3 (May 1988) . - pp 591 - 595 Titre : A proposed approach to determine the infrared emissivities of terrestrial surfaces from airborne or spaceborne platforms Type de document : Article/Communication Auteurs : R. Zhang, Auteur Année de publication : 1988 Article en page(s) : pp 591 - 595 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bande infrarouge [Termes IGN] emissivité [Termes IGN] radiométrie [Termes IGN] surface (géométrie) Numéro de notice : A1988-116 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168808954879 En ligne : https://doi.org/10.1080/01431168808954879 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24695 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-88031	RAB	Revue	Centre de documentation	En réserve L003	Disponible