Centre de documentation
scientifique

Spectral–spatial classification of hyperspectral images with a superpixel-based discriminative sparse model / Leyuan Fang in IEEE Transactions on geoscience and remote sensing, vol 53 n° 8 (August 2015)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 53 n° 8 (August 2015) . - pp 4186 - 4201 Titre : Spectral–spatial classification of hyperspectral images with a superpixel-based discriminative sparse model Type de document : Article/Communication Auteurs : Leyuan Fang, Auteur ; S. Li, Auteur ; Xudong Kang, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 4186 - 4201 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] algorithme d'apprentissage [Termes IGN] analyse discriminante [Termes IGN] apprentissage automatique [Termes IGN] classification spectrale [Termes IGN] image hyperspectrale Résumé : (Auteur) A novel superpixel-based discriminative sparse model (SBDSM) for spectral-spatial classification of hyperspectral images (HSIs) is proposed. Here, a superpixel in a HSI is considered as a small spatial region whose size and shape can be adaptively adjusted for different spatial structures. In the proposed approach, the SBDSM first clusters the HSI into many superpixels using an efficient oversegmentation method. Then, pixels within each superpixel are jointly represented by a set of common atoms from a dictionary via a joint sparse regularization. The recovered sparse coefficients are utilized to determine the class label of the superpixel. In addition, instead of directly using a large number of sampled pixels as dictionary atoms, the SBDSM applies a discriminative K-SVD learning algorithm to simultaneously train a compact representation dictionary, as well as a discriminative classifier. Furthermore, by utilizing the class label information of training pixels and dictionary atoms, a class-labeled orthogonal matching pursuit is proposed to accelerate the K-SVD algorithm while still enforcing high discriminability on sparse coefficients when training the classifier. Experimental results on four real HSI datasets demonstrate the superiority of the proposed SBDSM algorithm over several well-known classification approaches in terms of both classification accuracies and computational speed. Numéro de notice : A2015-384 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2015.2392755 En ligne : https://doi.org/10.1109/TGRS.2015.2392755 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76859 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-2015081	RAB	Revue	Centre de documentation	En réserve L003	Disponible

vol 15 n° 2 - April 2011 (Bulletin de Transactions in GIS) / Suzana Dragićević  

Public [n° ou bulletin]  est un bulletin de Transactions in GIS (1996 -)   Titre : vol 15 n° 2 - April 2011 Type de document : Périodique Auteurs : Suzana Dragićević, Éditeur scientifique ; S. Li, Éditeur scientifique ; M. Brovelli, Éditeur scientifique ; B. Veenendaal, Éditeur scientifique Année de publication : 2011 Importance : 90 p. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] web mapping Numéro de notice : 040-201102 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Numéro de périodique En ligne : http://onlinelibrary.wiley.com/doi/10.1111/tgis.2011.15.issue-2/issuetoc Format de la ressource électronique : URL sommaire Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=13306 [n° ou bulletin]

Contient

• Exploring the boundaries of web map services: the example of the online injury atlas for Ontario / Claus Rinner in Transactions in GIS, vol 15 n° 2 (April 2011)  
• Web-based GIS approaches to enhance public participation in wind farm planning / R. Berry in Transactions in GIS, vol 15 n° 2 (April 2011)  
• Improving the monitoring of the status of the environment through web geo-services: the example of large structures supervision / M. Brovelli in Transactions in GIS, vol 15 n° 2 (April 2011)  
• A web GIS for sea ice information and an ice service archive / S. Li in Transactions in GIS, vol 15 n° 2 (April 2011)  
• Collaborative web-GIS design: a case study for road risk analysis and monitoring / Francesco Pirotti in Transactions in GIS, vol 15 n° 2 (April 2011)  
• Weka-STPM: a software architecture and prototype for semantic trajectory data mining and visualization / Vania Bogorny in Transactions in GIS, vol 15 n° 2 (April 2011)  

A web GIS for sea ice information and an ice service archive / S. Li in Transactions in GIS, vol 15 n° 2 (April 2011)  

Public [article]  inTransactions in GIS > vol 15 n° 2 (April 2011) . - pp 189 - 211 Titre : A web GIS for sea ice information and an ice service archive Type de document : Article/Communication Auteurs : S. Li, Auteur ; C. Xiong, Auteur ; Z. Ou, Auteur Année de publication : 2011 Article en page(s) : pp 189 - 211 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] archives [Termes IGN] Arctique [Termes IGN] données localisées [Termes IGN] géologie [Termes IGN] glace de mer [Termes IGN] service web géographique [Termes IGN] WebSIG Résumé : (Auteur) Sea ice data has significant scientific value for climate, environmental impact and engineering studies leading to the construction of facilities in Arctic waters, as well as to support tourism and fishing planning. Large collections of such data are acquired, compiled, produced and maintained by national and international agencies such as the Canadian Ice Service (CIS). Some of these data collections have been made available online. However, current Internet-based sea ice data dissemination practices do not foster easy access to and use of the data, especially given the amount of the archived sea ice data and the nature of their spatial changes and high temporal variations. This article reports a research effort in developing a web-based geographical information system (GIS) that facilitates the access and use of the historical sea ice data. The system provides online access, exploration, visualization, and analysis of the archived data, mostly in the form of ice charts, within a web-based GIS. The results from a prototype development indicate that web GIS, developed using Rich Internet Application (RIA) technologies, provides added values in serving sea ice data and suggests that such a system can better accommodate more advanced sea ice data access and analysis tools. Numéro de notice : A2011-105 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01250.x Date de publication en ligne : 04/04/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01250.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30885 [article]

Architecture design and prototyping of a Web-based, synchronous collaborative 3D GIS / Z. Chang in Cartography and Geographic Information Science, vol 35 n° 2 (April 2008)  

Public [article]  inCartography and Geographic Information Science > vol 35 n° 2 (April 2008) . - pp 117 - 132 Titre : Architecture design and prototyping of a Web-based, synchronous collaborative 3D GIS Type de document : Article/Communication Auteurs : Z. Chang, Auteur ; S. Li, Auteur Année de publication : 2008 Article en page(s) : pp 117 - 132 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] aide à la décision [Termes IGN] architecture de système [Termes IGN] composant SIG [Termes IGN] SIG 3D [Termes IGN] SIG participatif Résumé : (Auteur) Collaborative GIS has emerged as an efficient, spatial decision-making tool, especially when 3D GIS models are integrated. While centralized architecture is still dominating the design and development of such tools and/or systems, alternative architecture, such as peer-to-peer (P2P), and hybrids have been given increasingly more attention in designing more scalable and efficient systems. This paper presents a conceptual hybrid system architecture for the development of integrated, synchronously collaborative environments with 3D GIS tools for group decision-making and 3D information sharing. In this paper, we discuss the major design issues related to such an architectural design and identify the spatial requirements of synchronous collaborative 3D GIS. A hybrid architectural model integrating centralized and replicated computing architecture is then designed to address the identified requirements. The proposed architecture was tested using data/message flow models developed to facilitate component-based collaborative 3D GIS systems. The results show that collaborative 3D GIS require collaboration computing different from that applied in generic GIS systems, and that a component-based development approach can lead to more light-weight systems. Copyright CaGISociety Numéro de notice : A2008-192 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1559/152304008784090577 En ligne : https://doi.org/10.1559/152304008784090577 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29187 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-08021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A complete classification of topological relations using the 9-intersection method / S. Li in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 589 - 610 Titre : A complete classification of topological relations using the 9-intersection method Type de document : Article/Communication Auteurs : S. Li, Auteur Année de publication : 2006 Article en page(s) : pp 589 - 610 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] géométrie euclidienne [Termes IGN] objet géographique complexe [Termes IGN] raisonnement spatial [Termes IGN] relation topologique Résumé : (Auteur) Formalization of topological relations between spatial objects is an important aspect of spatial representation and reasoning. The well-known 9-Intersection Method (9IM) was previously used to characterize topological relations between simple regions, i.e. regions with connected boundary and exterior. This simplified abstraction of spatial objects as simple regions cannot model the variety and complexity of spatial objects. For example, countries like Italy may contain islands and holes. It is necessary that existing formalisms, 9IM in particular, cover this variety and complexity. This paper generalizes 9IM to cope with general regions, where a (general) region is a non-empty proper regular closed subset of the Euclidean plane. We give a complete classification of topological relations between plane regions. For each possible relation we either show that it violates some topological constraints and hence is non-realizable or find two plane regions it relates. Altogether 43 (out of 512) relations are identified as realizable. Among these, five can be realized only between exotic (plane) regions, where a region is exotic if there is another region that has the same boundary but is not its complement. For all the remaining 38 relations, we construct configurations by using sums, differences and complements of discs. Copyright Taylor & Francis Numéro de notice : A2006-236 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600661383 En ligne : https://doi.org/10.1080/13658810600661383 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27963 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06061	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06062	RAB	Revue	Centre de documentation	En réserve L003	Disponible