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scientifique

Shanghai subway tunnels and highways monitoring through Cosmo-SkyMed Persistent Scatterers / Daniele Perissin in ISPRS Journal of photogrammetry and remote sensing, vol 73 (September 2012)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 73 (September 2012) . - pp 58 - 67 Titre : Shanghai subway tunnels and highways monitoring through Cosmo-SkyMed Persistent Scatterers Type de document : Article/Communication Auteurs : Daniele Perissin, Auteur ; Z. Wang, Auteur ; H. Lin, Auteur Année de publication : 2012 Article en page(s) : pp 58 - 67 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] autoroute [Termes IGN] Chine [Termes IGN] coin réflecteur [Termes IGN] détection de changement [Termes IGN] image à haute résolution [Termes IGN] image Cosmo-Skymed [Termes IGN] Shanghai (Chine) [Termes IGN] surveillance d'ouvrage [Termes IGN] tunnel Résumé : (Auteur) Synthetic Aperture Radar Interferometry (InSAR) is an alternative technique to obtain measurements of surface displacement providing better spatial resolution and comparable accuracy at an extremely lower cost per area than conventional surveying methods. InSAR is becoming more and more popular in monitoring urban deformations, however, the technique requires advanced tools and high level competence to be successfully applied. In this paper we report important results obtained by analyzing new high resolution SAR data in the Shanghai urban area. The data used in this work have been acquired by the Italian X-band sensor Cosmo-SkyMed. About 1.2 million of individual and independent targets have been detected in 600 sq km, revealing impressive details of the ground surface deformation. Using the SARPROZ InSAR tool and integrating the results with Google Earth, we were able to track subway tunnels recently excavated and several highways. Tunnels are visible due to very localized subsidence of the above surface along their path. On the other hand, highways, standing over the ground, in most cases show higher stability than the surrounding areas. The density of targets is so high to allow studying the profile of the tunnel subsidence, which is very useful to predict building damage. Finally, the identification of targets on high buildings helps checking the stability of high constructions along the subway lines, highlighting possible risky situations. Numéro de notice : A2012-315 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2012.07.002 Date de publication en ligne : 06/09/2012 En ligne : https://doi.org/10.1016/j.isprsjprs.2012.07.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31761 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2012071	SL	Revue	Centre de documentation	Revues en salle	Disponible

Urban change detection based on coherence and intensity characteristics of SAR imagery / M. Liao in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 8 (August 2008)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 74 n° 8 (August 2008) . - pp 999 - 1006 Titre : Urban change detection based on coherence and intensity characteristics of SAR imagery Type de document : Article/Communication Auteurs : M. Liao, Auteur ; L. Jiang, Auteur ; H. Lin, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 999 - 1006 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] analyse diachronique [Termes IGN] cohérence (physique) [Termes IGN] croissance urbaine [Termes IGN] détection de changement [Termes IGN] extraction de traits caractéristiques [Termes IGN] image ERS-SAR [Termes IGN] image multitemporelle [Termes IGN] image radar moirée [Termes IGN] intensité lumineuse [Termes IGN] radargrammétrie [Termes IGN] seuillage d'image [Termes IGN] Shanghai (Chine) Résumé : (Auteur) In this paper, an unsupervised change-detection approach was proposed to detect new urban areas from multi-temporal SAR images. The novelty of the proposed approach is the joint use of coherence and intensity characteristics of SAR imagery. The approach involves two main steps: (a) the extraction of difference feature containing information on changed areas, and (b) the unsupervised two-dimensional (2D) thresholding. First, two difference features based on the concepts of long-term coherence and backscattering temporal variability are extracted from a series of multitemporal SAR images. Then, the resulting features that represent the INSAR signal temporal variability of changed areas are merged, and a 2D thresholding technique based on the maximum 2D Renyi’s entropy criterion is developed to obtain the change-detection results. The effectiveness of the proposed approach is confirmed with experimental results obtained from a set of six ERS-1/2 SLC SAR images acquired in Shanghai, China. Copyright ASPRS Numéro de notice : A2008-329 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.74.8.999 En ligne : https://doi.org/10.14358/PERS.74.8.999 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29322 [article]

Indexing network-constrained trajectories for connectivity-based queries / X. Li in International journal of geographical information science IJGIS, vol 20 n° 3 (march 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 3 (march 2006) . - pp 303 - 328 Titre : Indexing network-constrained trajectories for connectivity-based queries Type de document : Article/Communication Auteurs : X. Li, Auteur ; H. Lin, Auteur Année de publication : 2006 Article en page(s) : pp 303 - 328 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] accès aux données localisées [Termes IGN] connexité (topologie) [Termes IGN] indexation spatiale [Termes IGN] objet mobile [Termes IGN] positionnement cinématique [Termes IGN] requête spatiotemporelle [Termes IGN] système d'information géographique Résumé : (Auteur) Recent advances in positioning and communication technologies have made it possible to collect trajectories of moving objects, and thus, corresponding applications that handle trajectories come into sight, e.g. applying vehicle trajectories to traffic studies, where various queries about trajectories are necessary. However, due to their special spatio-temporal query conditions, trajectory queries are different from existing GIS queries, and there is still a lack of efficient data-access methods to support queries about trajectories. In view of this, we develop a data-access method, named a Topology-based Mixed Index Structure (TMIS), to index network-constrained trajectories for connectivity-based queries. The TMIS indeed is not a novel index structure but a novel combination of simple and classical index structures linked by the topology of a network. The TMIS can support more query types through different combinations of simple and classical index structures and can be applied to a large network. Existing database management systems can be employed to implement the TMIS. In this paper, we first define network-constrained trajectories and connectivity-based queries, and then introduce the principles, architecture, algorithms, and query processing of the TMIS. Finally, we implement the TMIS and validate it through a series of analyses and experiments. Numéro de notice : A2006-094 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500432570 En ligne : https://doi.org/10.1080/13658810500432570 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27821 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06032	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Distributed virtual environments for managing country parks in Hong Kong: a case study of the Shing Mun Country Park / H. Lin in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 4 (April 2002)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 4 (April 2002) . - pp 369 - 377 Titre : Distributed virtual environments for managing country parks in Hong Kong: a case study of the Shing Mun Country Park Type de document : Article/Communication Auteurs : H. Lin, Auteur ; J. Gong, Auteur Année de publication : 2002 Article en page(s) : pp 369 - 377 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] environnement virtuel à traitement réparti [Termes IGN] Hong-Kong [Termes IGN] objet géographique 3D [Termes IGN] réalité virtuelle [Termes IGN] visualisation 3D [Termes IGN] VRML Résumé : (Auteur)Distributed virtual environments (DVE) are environments that ore not only used for managing and delivering m multi-source, multi-dimensional, geographical information, but also enable geographically distributed users to navigate in a 3D space, and to interact with objects and with other online users. In this paper, we design DVES to disseminate 2D and 3D data and to implement public participation in the management of the country parks in Hong Kong. The system framework, geo-data model, and user's interface are discussed for designing DVES. Based on the Virtual Reality Modeling Language (VRML), Java, and VRML External Authoring Interface (EAI) classes, a balanced client/server architecture is employed. In view of multi-source and multi-dimensional data, the object-oriented approach is utilized to design 3D geo-object models for web-based distribution. Considering the Internet bandwidth and performance of client computers, we adopt multi-block and multi-level approaches to the design of 3D geo-objects. The user's interface provides capabilities for implementing 2D and 3D view, data query and analysis, object addition/removal, and 3D avatar-based and text-based communication. This paper presents a case study of the Shing Mun Country Park in Hong Kong, where a prototype DVE, called "VirtualPark", was developed. Numéro de notice : A2002-069 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/2002journal/april/2002_apr_369-377 [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21985 [article]

3-D dynamic simulation and visualization of landslide models : a case study of the Shum wan road landslide in Hong Kong / Jianhua Gong (2001)  

Public contenu dans Mapping the 21st century: the 20th International Cartographic Conference, ICC 2001, Beijing, China, August 6 - 10, 2001, vol 4. Proceedings / L. Li (2001)   Titre : 3-D dynamic simulation and visualization of landslide models : a case study of the Shum wan road landslide in Hong Kong Type de document : Article/Communication Auteurs : Jianhua Gong, Auteur ; H. Lin, Auteur ; L. Xianhua, Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2001 Conférence : ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings Importance : pp 2618 - 2626 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] Hong-Kong [Termes IGN] modélisation 3D [Termes IGN] paysage [Termes IGN] simulation 3D [Termes IGN] visualisation 3D Résumé : (Auteur) This paper builds a group of landside-related models including the model of geometric and physical parameters of landslide, sliding direction and stability coefficient model, specific stability coefficient model based on dynamic geographical environments, and dynamic process model of landslide. The dynamic relationship between landslide's stability coefficient and landslide band soil's water content, and internal cohesive force under varied space-time distribution are studied. A Iandsilde simulation and visualization system is designed and developed for model computation and visualization of landslide process. The system and landslide- related models are used for studying the Shum Wan Road landslide in Hong Kong. Numéro de notice : C2001-050 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f16028.pd [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64957