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The partial sequenced route query with traveling rules in road networks / H. Chen in Geoinformatica, vol 15 n° 3 (July 2011)  

Public [article]  inGeoinformatica > vol 15 n° 3 (July 2011) . - pp 541 - 569 Titre : The partial sequenced route query with traveling rules in road networks Type de document : Article/Communication Auteurs : H. Chen, Auteur ; W. Ku, Auteur ; M. Sun, Auteur ; R. Zimmermann, Auteur Année de publication : 2011 Article en page(s) : pp 541 - 569 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] calcul d'itinéraire [Termes IGN] itinéraire [Termes IGN] point d'intérêt [Termes IGN] requête spatiale [Termes IGN] réseau routier [Termes IGN] service fondé sur la position Résumé : (Auteur) In modern geographic information systems, route search represents an important class of queries. In route search related applications, users may want to define a number of traveling rules (traveling preferences) when they plan their trips. However, these traveling rules are not considered in most existing techniques. In this paper, we propose a novel spatial query type, the multi-rule partial sequenced route (MRPSR) query, which enables efficient trip planning with user defined traveling rules. The MRPSR query provides a unified framework that subsumes the well-known trip planning query (TPQ) and the optimal sequenced route (OSR) query. The difficulty in answering MRPSR queries lies in how to integrate multiple choices of points-of-interest (POI) with traveling rules when searching for satisfying routes. We prove that MRPSR query is NP-hard and then provide three algorithms by mapping traveling rules to an activity on vertex network. Afterwards, we extend all the proposed algorithms to road networks. By utilizing both real and synthetic POI datasets, we investigate the performance of our algorithms. The results of extensive simulations show that our algorithms are able to answer MRPSR queries effectively and efficiently with underlying road networks. Compared to the Light Optimal Route Discoverer (LORD) based brute-force solution, the response time of our algorithms is significantly reduced while the distances of the computed routes are only slightly longer than the shortest route. Numéro de notice : A2011-211 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-010-0115-2 Date de publication en ligne : 03/09/2010 En ligne : https://doi.org/10.1007/s10707-010-0115-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30989 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-2011031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Precise orthoimage generation of Dunhuang wall painting / Y. Zhang in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 6 (June 2011)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 77 n° 6 (June 2011) . - pp 631 - 640 Titre : Precise orthoimage generation of Dunhuang wall painting Type de document : Article/Communication Auteurs : Y. Zhang, Auteur ; Z. Zhang, Auteur ; M. Sun, Auteur ; T. Ke, Auteur Année de publication : 2011 Article en page(s) : pp 631 - 640 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes IGN] acquisition d'images [Termes IGN] appariement d'images [Termes IGN] compensation par faisceaux [Termes IGN] diagramme de Voronoï [Termes IGN] grotte [Termes IGN] Kansou (Chine) [Termes IGN] orientation relative [Termes IGN] orthoimage couleur [Termes IGN] peinture [Termes IGN] photogrammétrie terrestre [Termes IGN] précision millimétrique Résumé : (Auteur) Wall painting plays an important role in the culture relics of the Mogao Caves in Dunhuang, P.R. China. A novel approach of generating a high-resolution orthoimage of the wall painting is proposed. Since the photographic object is nearly flat and also the forward overlap between adjacent images is smaller than 60 percent, the main difficulty to be resolved is the high correlation problem among the unknowns. Improved models of relative orientation and bundle adjustment with virtual constraints have been developed to resolve the high correlation problem. A Voronoi diagram of projective footprints is applied to automatically determine the mosaic lines of ortho-rectified images. The color quality of the generated orthoimage is improved through global minimization of the color differences among overlapped images. The experimental results show that the proposed approach has great potential for conservation of wall paintings with sub-millimeter to millimeter precision. Numéro de notice : A2011-257 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.77.6.631 En ligne : https://doi.org/10.14358/PERS.77.6.631 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31035 [article]

Incorporating data quality information in mapping American community survey data / M. Sun in Cartography and Geographic Information Science, vol 37 n° 4 (October 2010)  

Public [article]  inCartography and Geographic Information Science > vol 37 n° 4 (October 2010) . - pp 285 - 300 Titre : Incorporating data quality information in mapping American community survey data Type de document : Article/Communication Auteurs : M. Sun, Auteur ; D. Wong, Auteur Année de publication : 2010 Article en page(s) : pp 285 - 300 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] données démographiques [Termes IGN] Etats-Unis [Termes IGN] fiabilité des données [Termes IGN] métadonnées [Termes IGN] qualité des données [Termes IGN] recensement démographique Résumé : (Auteur) This paper proposes a set of methods to map the American Community Survey (ACS) data disseminated by the U.S. Census Bureau. The ACS replaces part of the original census (long form) in the 2010 decennial Census in the U.S. Reliability of estimates should be taken into account when analyzing and mapping ACS data because these estimates are derived from surveys with sample sizes much smaller than those in the decennial censuses. Most maps using ACS data do not include data reliability information. In this article, we review the standard data quality or reliability information accompanying the ACS estimates. We propose a set of techniques to map ACS estimates by incorporating the margin of error (MOE) or related information either on the map display or in the mapping process. The techniques are proposed in two contexts: recognizing the varying degree of reliability among estimates, and determining if estimates are statistically different. They offer cartographers and GIS users some options to map ACS estimates and handle the reliability information simultaneously. Numéro de notice : A2010-539 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304010793454363 En ligne : https://doi.org/10.1559/152304010793454363 Format de la ressource électronique : url artcle Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30731 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-2010041	RAB	Revue	Centre de documentation	En réserve L003	Disponible