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Pattern-mining approach for conflating crowdsourcing road networks with POIs / Bisheng Yang in International journal of geographical information science IJGIS, vol 29 n° 5 (May 2015)
[article]
Titre : Pattern-mining approach for conflating crowdsourcing road networks with POIs Type de document : Article/Communication Auteurs : Bisheng Yang, Auteur ; Yunfei Zhang, Auteur Année de publication : 2015 Article en page(s) : pp 786 - 805 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] acquisition de données
[Termes IGN] appariement de données localisées
[Termes IGN] conflation
[Termes IGN] données localisées
[Termes IGN] données localisées des bénévoles
[Termes IGN] données multisources
[Termes IGN] exploration de données
[Termes IGN] graphe
[Termes IGN] point d'intérêt
[Termes IGN] précision du positionnement
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] précision sémantique
[Termes IGN] qualité des données
[Termes IGN] réseau routier
[Termes IGN] squelettisationRésumé : (Auteur) Crowdsourcing geospatial data mainly collected by public citizens have brought about a profound transformation on data acquisition and utilization. However, the unpredictable positional accuracies, unstructured semantic descriptions, and invalid spatial relations occur to crowdsourcing geospatial data, causing difficulties for conflating heterogeneous data sets collected by different professional agencies or volunteers. We thus propose a novel pattern-mining approach to conflate crowdsourcing road networks with points of interest (POIs) geometrically and semantically. The proposed method mines the geometric patterns between road networks and POIs respectively and generates the pattern-related skeleton graphs for them. Then, corresponding points are determined between the two skeleton graphs to align POIs and road networks geometrically, and the road-related semantic data between the associated POIs and the road segments are compared to check the data quality of POIs and infer the road names of the road segments. Experimental results show the advantages of our proposed method, demonstrating a functional and promising solution for enriching POIs and road network geometrically and semantically. Numéro de notice : A2015-593 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2014.997238 En ligne : https://doi.org/10.1080/13658816.2014.997238 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77883
in International journal of geographical information science IJGIS > vol 29 n° 5 (May 2015) . - pp 786 - 805[article]A geographic approach for combining social media and authoritative data towards identifying useful information for disaster management / João Porto de Albuquerque in International journal of geographical information science IJGIS, vol 29 n° 4 (April 2015)
[article]
Titre : A geographic approach for combining social media and authoritative data towards identifying useful information for disaster management Type de document : Article/Communication Auteurs : João Porto de Albuquerque, Auteur ; Benjamin Herfort, Auteur ; Alexander Brenning, Auteur ; Alexander Zipf, Auteur Année de publication : 2015 Article en page(s) : pp 667 - 689 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] acquisition de données
[Termes IGN] Allemagne
[Termes IGN] données issues des réseaux sociaux
[Termes IGN] données localisées des bénévoles
[Termes IGN] Elbe (fleuve)
[Termes IGN] géopositionnement
[Termes IGN] gestion de crise
[Termes IGN] inondation
[Termes IGN] qualité des données
[Termes IGN] risque naturel
[Termes IGN] TwitterRésumé : (Auteur) In recent years, social media emerged as a potential resource to improve the management of crisis situations such as disasters triggered by natural hazards. Although there is a growing research body concerned with the analysis of the usage of social media during disasters, most previous work has concentrated on using social media as a stand-alone information source, whereas its combination with other information sources holds a still underexplored potential. This article presents an approach to enhance the identification of relevant messages from social media that relies upon the relations between georeferenced social media messages as Volunteered Geographic Information and geographic features of flood phenomena as derived from authoritative data (sensor data, hydrological data and digital elevation models). We apply this approach to examine the micro-blogging text messages of the Twitter platform (tweets) produced during the River Elbe Flood of June 2013 in Germany. This is performed by means of a statistical analysis aimed at identifying general spatial patterns in the occurrence of flood-related tweets that may be associated with proximity to and severity of flood events. The results show that messages near (up to 10 km) to severely flooded areas have a much higher probability of being related to floods. In this manner, we conclude that the geographic approach proposed here provides a reliable quantitative indicator of the usefulness of messages from social media by leveraging the existing knowledge about natural hazards such as floods, thus being valuable for disaster management in both crisis response and preventive monitoring. Numéro de notice : A2015-591 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2014.996567 En ligne : http://www.tandfonline.com/doi/full/10.1080/13658816.2014.996567 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77878
in International journal of geographical information science IJGIS > vol 29 n° 4 (April 2015) . - pp 667 - 689[article]Temporal stability of X-band single-pass InSAR heights in a spruce forest: effects of acquisition properties and season / Svein Solberg in IEEE Transactions on geoscience and remote sensing, vol 53 n° 3 (March 2015)
[article]
Titre : Temporal stability of X-band single-pass InSAR heights in a spruce forest: effects of acquisition properties and season Type de document : Article/Communication Auteurs : Svein Solberg, Auteur ; Dan Johan Weydahl, Auteur ; Rasmus Astrup, Auteur Année de publication : 2015 Article en page(s) : pp 1607 - 1614 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] acquisition de données
[Termes IGN] bande X
[Termes IGN] biomasse
[Termes IGN] données météorologiques
[Termes IGN] forêt boréale
[Termes IGN] image radar moirée
[Termes IGN] image TanDEM-X
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] Norvège
[Termes IGN] Picea abies
[Termes IGN] stabilité dans le temps
[Termes IGN] surveillance forestièreRésumé : (Auteur) We investigated the stability of TanDEM-X interferometric synthetic aperture radar (InSAR) heights across eight repeated acquisitions. With InSAR height we mean the height above ground of the scattering phase center. We obtained InSAR heights by subtracting a digital terrain model generated from airborne laser scanning. The acquisitions varied in polarization, normal baseline, and season. The study area was a spruce forest in southeastern Norway. We established 179 field plots within 26 selected forest stands and obtained aboveground biomass (AGB) from field inventory. The InSAR heights were generally stable across the acquisitions as was the relationship between AGB and InSAR height, although systematic and random variations were noted. Two acquisitions had close-to-identical technical properties and weather conditions, and they produced close-to-identical InSAR heights. InSAR heights were fairly stable across a range in temperature and precipitation through spring, summer, and autumn, across a range in baseline values and for both HH and VV polarizations. However, a winter acquisition at temperatures of -7°C had much deeper penetration into the canopy and generated considerably lower InSAR heights and, hence, a very different relationship with biomass. Higher random errors were noted in a cross-pol data set due to lower backscatter and when the normal baseline was very small or very large. A height of ambiguity around 20-50 m appeared to be optimal. Interferometric X-band SAR can be used for monitoring coniferous boreal forests as long as the season and technical properties of the acquisition are kept within certain ranges. Numéro de notice : A2015-139 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2014.2346473 Date de publication en ligne : 28/08/2014 En ligne : https://doi.org/10.1109/TGRS.2014.2346473 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75806
in IEEE Transactions on geoscience and remote sensing > vol 53 n° 3 (March 2015) . - pp 1607 - 1614[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 065-2015031 RAB Revue Centre de documentation En réserve L003 Disponible The decision task complexity and information acquisition strategies in GIS-MCDA / Mohammadreza Jelokhani-Niaraki in International journal of geographical information science IJGIS, vol 29 n° 2 (February 2015)
[article]
Titre : The decision task complexity and information acquisition strategies in GIS-MCDA Type de document : Article/Communication Auteurs : Mohammadreza Jelokhani-Niaraki, Auteur ; Jacek Malczewski, Auteur Année de publication : 2015 Article en page(s) : pp 327 - 344 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] acquisition de données
[Termes IGN] analyse multicritère
[Termes IGN] complexité
[Termes IGN] outil d'aide à la décision
[Termes IGN] TéhéranRésumé : (Auteur) This paper addresses the research question of how does the complexity of a decision task affect information acquisition strategies used by decision-makers in a GIS-based multicriteria decision analysis (MCDA)? It reports the results of an experimental study that investigated the effect of task complexity (information load) on information acquisition strategies in the use of a multicriteria spatial decision support system (MC-SDSS). The experiment involved the use of the MC-SDSS for online parking site selection (ranking) in District # 22 of Tehran, Iran at four levels of complexity. The complexity of the site selection task was manipulated in terms of the number of: (1) decision alternatives available to decision-makers and (2) the evaluation criteria (attributes) used to describe the alternatives. At each level of task complexity, the site selection process was carried out in two GIS-MCDA modes: individual and group (collaborative) modes. The findings demonstrate that: (1) an increase in task complexity tend to result in the use of non-compensatory decision strategies; (2) decision-makers using compensatory strategies spend more time acquiring information from decision tables than maps, and (3) the task complexity has no impact on the interaction between the map and table uses. Numéro de notice : A2015-581 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2014.947614 En ligne : http://www.tandfonline.com/doi/full/10.1080/13658816.2014.947614 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77843
in International journal of geographical information science IJGIS > vol 29 n° 2 (February 2015) . - pp 327 - 344[article]Accounting for Galileo–GPS inter-system biases in precise satellite positioning / Jacek Paziewski in Journal of geodesy, vol 89 n° 1 (January 2015)
[article]
Titre : Accounting for Galileo–GPS inter-system biases in precise satellite positioning Type de document : Article/Communication Auteurs : Jacek Paziewski, Auteur ; Pawel Wielgosz, Auteur Année de publication : 2015 Article en page(s) : pp 81 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] acquisition de données
[Termes IGN] analyse comparative
[Termes IGN] données GNSS
[Termes IGN] double différence
[Termes IGN] erreur systématique
[Termes IGN] fusion de données
[Termes IGN] positionnement différentiel
[Termes IGN] signal Galileo
[Termes IGN] signal GPS
[Termes IGN] stabilité dans le tempsRésumé : (auteur) Availability of two overlapping frequencies L1/E1 and L5/E5a of the signals transmitted by GPS and Galileo systems offers the possibility of tightly combining observations from both systems in a single observational model. A tightly combined observational model assumes a single reference satellite for all observations from both Galileo and GPS systems. However, when inter-system double-differenced observations are created, receiver inter-system bias is introduced. This study presents the results and the methodology for estimation and accounting for phase and code GPS-Galileo inter-system bias in precise relative positioning. The research investigates the size and temporal stability of the estimated bias for different receiver pairs as well as examines the influence of accounting for the inter-system bias on the user position solution. The obtained numerical results are based on four experiments carried out at different locations and time periods using both real and simulated GNSS data. Numéro de notice : A2015-329 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0763-3 En ligne : https://doi.org/10.1007/s00190-014-0763-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76654
in Journal of geodesy > vol 89 n° 1 (January 2015) . - pp 81 - 93[article]PermalinkPermalinkRemote sensing and image interpretation / Thomas M. Lillesand (2015)PermalinkGeneration of dense 3D point clouds using a small quadcopter / Julien Li-Chee-Ming in Geomatica, vol 68 n° 4 (December 2014)PermalinkL'information géographique / Bengt Rystedt in Cartes & Géomatique, n° 221 (septembre 2014)PermalinkRencontres DécryptaGéo 2014 / Françoise de Blomac in DécryptaGéo le mag, n° 157 (01/05/2014)PermalinkLes Geocubes : réseau de capteurs autonomes géolocalisés pour la surveillance de structures et de zones à risque / Lionel Benoit in XYZ, n° 138 (mars - mai 2014)PermalinkLa topographie au service de la gendarmerie nationale : fixation de l'état des lieux dans un contexte criminalistique (concept et moyen) / Hervé Daudigny in XYZ, n° 138 (mars - mai 2014)PermalinkPermalinkGeoCameroun dessine le pays / Michel Ravelet in Géomètre, n° 2110 (janvier 2014)Permalink