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On metonymy recognition for geographic information retrieval / J. Leveling in International journal of geographical information science IJGIS, vol 22 n° 3 (march 2008)
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[article]
Titre : On metonymy recognition for geographic information retrieval Type de document : Article/Communication Auteurs : J. Leveling, Auteur ; S. Hartrumpf, Auteur Année de publication : 2008 Article en page(s) : pp 289 - 299 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] géomatique web
[Termes IGN] langage naturel (informatique)
[Termes IGN] recherche d'information géographique
[Termes IGN] toponymeRésumé : (Auteur) Metonymically used location names (toponyms) refer to other, related entities and thus possess a meaning different from their literal, geographic sense. Metonymic uses are to be treated differently to improve the performance of geographic information retrieval (GIR). Statistics on toponym senses show that 75.06% of all location names are used in their literal sense, 17.05% are used metonymically, and 7.89% have a mixed sense. This article presents a method for disambiguating location names in texts between literal and metonymic senses, based on shallow features. The evaluation of this method is two-fold. First, we use a memory-based learner (TiMBL) to train a classifier and determine standard evaluation measures such as F-score and accuracy. The classifier achieved an F-score of 0.842 and an accuracy of 0.846 for identifying toponym senses in a subset of the CoNLL (Conference on Natural Language Learning) data. Second, we perform retrieval experiments based on the GeoCLEF data (newspaper article corpus and queries) from 2005 and 2006. We compare searching location names in a database index containing both their literal and metonymic senses with searching in an index containing their literal senses only. Evaluation results indicate that removing metonymic senses from the index yields a higher mean average precision (MAP) for GIR. In total, we observed a significant gain in MAP: an increase from 0.0704 to 0.0715 MAP for the GeoCLEF 2005 data, and an increase from 0.1944 to 0.2100 MAP for the GeoCLEF 2006 data. Copyright Taylor & Francis Numéro de notice : A2008-140 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701626244 En ligne : https://doi.org/10.1080/13658810701626244 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29135
in International journal of geographical information science IJGIS > vol 22 n° 3 (march 2008) . - pp 289 - 299[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-08021 RAB Revue Centre de documentation En réserve L003 Disponible 079-08022 RAB Revue Centre de documentation En réserve L003 Disponible Using co-occurrence models for placename disambiguation / S. Overell in International journal of geographical information science IJGIS, vol 22 n° 3 (march 2008)
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Titre : Using co-occurrence models for placename disambiguation Type de document : Article/Communication Auteurs : S. Overell, Auteur ; S. Ruger, Auteur Année de publication : 2008 Article en page(s) : pp 265 - 287 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] accès aux données localisées
[Termes IGN] matrice de co-occurrence
[Termes IGN] recherche d'information géographique
[Termes IGN] résolution d'ambiguïté
[Termes IGN] toponymeRésumé : (Auteur) This paper describes the generation of a model capturing information on how placenames co-occur together. The advantages of the co-occurrence model over traditional gazetteers are discussed and the problem of placename disambiguation is presented as a case study. We begin by outlining the problem of ambiguous placenames. We demonstrate how analysis of Wikipedia can be used in the generation of a co-occurrence model. The accuracy of our model is compared to a handcrafted ground truth; then we evaluate alternative methods of applying this model to the disambiguation of placenames in free text (using the GeoCLEF evaluation forum). We conclude by showing how the inclusion of placenames in both the text and geographic parts of a query provides the maximum mean average precision and outline the benefits of a co-occurrence model as a data source for the wider field of geographic information retrieval (GIR). Copyright Taylor & Francis Numéro de notice : A2008-139 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701626236 En ligne : https://doi.org/10.1080/13658810701626236 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29134
in International journal of geographical information science IJGIS > vol 22 n° 3 (march 2008) . - pp 265 - 287[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-08021 RAB Revue Centre de documentation En réserve L003 Disponible 079-08022 RAB Revue Centre de documentation En réserve L003 Disponible Spatial sampling uncertainty in SMEX04 soil moisture fields: a data-based resampling experiment / M. Gebremichael in Remote sensing of environment, vol 112 n° 2 (15/02/2008)
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[article]
Titre : Spatial sampling uncertainty in SMEX04 soil moisture fields: a data-based resampling experiment Type de document : Article/Communication Auteurs : M. Gebremichael, Auteur ; E.R. Vivoni, Auteur Année de publication : 2008 Article en page(s) : pp 326 - 336 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] échantillonnage d'image
[Termes IGN] humidité du sol
[Termes IGN] image aérienne
[Termes IGN] image radar
[Termes IGN] incertitude des données
[Termes IGN] Mexico (Mexique)
[Termes IGN] Soil Moisture ExperimentRésumé : (Auteur) A data-based resampling experiment is performed to estimate sampling errors of area-averaged soil moisture estimates due to spatial sampling by ground-based sensors. The data consists of high-resolution soil moisture images derived from the Polarimetric Scanning Radiometer (PSR/CX) sensor flown on an aircraft as part of the summer field experiment (SMEX04 — Soil Moisture Experiment 2004) in the monsoon region of Sonora, Mexico. The sampling characteristics are investigated by accounting for random networks and evenly spaced networks. For random network designs, we develop a simple model that can be used to estimate the sampling uncertainty (expressed as standard deviation of sampling error as a percentage of the areal mean soil moisture) as a function of the number of sensors, mean soil moisture content and averaging area. This model is valid for five or more sensors. The model should prove useful to those wishing to assess the area-averaged performance of a soil moisture network. Furthermore, the method of analysis is applicable to other study regions (Oklahoma, Iowa, Alabama, Georgia, and Arizona) where soil moisture fields have been mapped at high resolution using airborne passive microwave remote sensors. Copyright Elsevier Numéro de notice : A2008-035 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2006.12.021 En ligne : https://doi.org/10.1016/j.rse.2006.12.021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29030
in Remote sensing of environment > vol 112 n° 2 (15/02/2008) . - pp 326 - 336[article]National Spatial Data Infrastructure Act / H. Murakami in GIM international, vol 22 n° 2 (February 2008)
[article]
Titre : National Spatial Data Infrastructure Act Type de document : Article/Communication Auteurs : H. Murakami, Auteur Année de publication : 2008 Article en page(s) : pp 15 - 17 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] base de données localisées
[Termes IGN] diffusion de données
[Termes IGN] droit
[Termes IGN] infrastructure nationale des données localisées
[Termes IGN] Japon
[Termes IGN] système d'information géographiqueRésumé : (Auteur) In may 2007, a new bill on National Spatial Infrastructure was enacted by the japanese government, aiming to provide a legal framework for the development and distribution of geo-information based on GIS and space-based Positioning, Navigation and Timing (PNT). Copyright Reed Business Information Numéro de notice : A2008-024 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29019
in GIM international > vol 22 n° 2 (February 2008) . - pp 15 - 17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-08021 RAB Revue Centre de documentation En réserve L003 Disponible Spatially and temporally continuous LAI data sets based on an integrated filtering method: examples from North America / H. Fang in Remote sensing of environment, vol 112 n° 1 (15/01/2008)
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Titre : Spatially and temporally continuous LAI data sets based on an integrated filtering method: examples from North America Type de document : Article/Communication Auteurs : H. Fang, Auteur ; Shunlin Liang, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 75 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] algorithme de filtrage
[Termes IGN] Amérique du nord
[Termes IGN] analyse comparative
[Termes IGN] analyse diachronique
[Termes IGN] données spatiotemporelles
[Termes IGN] image Landsat-ETM+
[Termes IGN] image Terra-MODIS
[Termes IGN] Leaf Area Index
[Termes IGN] qualité des donnéesRésumé : (Auteur) Leaf Area Index (LAI) is an important biophysical variable for characterizing the land surface vegetation. Global LAI product has been routinely produced from the MODerate resolution Imaging Spectroradiometer (MODIS) aboard the Terra and Aqua satellite platforms. However, the MODIS standard LAI product is not continuous both spatially and temporally. To fill the gaps and improve the quality, we have developed a data filtering algorithm. This filter, called the temporal spatial filter (TSF), integrates both spatial and temporal characteristics for different plant functional types. The spatial gaps are first filled with the multi-year averages of the same day. If the values are missing over all years, the pixel is filled with a new estimate using the vegetation continuous field–ecosystem curve fitting method. The TSF integrates both the multi-seasonal average trend (background) and the seasonal observation. We implement this algorithm using the MODIS Collection 4 LAI product over North America. Comparison of the TSF results with the Savitzky–Golay filter indicates that the TSF performs much better in restoring the spatial and temporal distribution of seasonal LAI trends. The new LAI product has been validated by comparing with field measurements and the derived LAI maps from ETM+ data at a broadleaf forest site and an agricultural site. The validation results indicate that the new LAI product agrees better with both the field measurements and LAI values obtained from the ETM+ than does the MODIS LAI standard product, which usually shows higher LAI values. Copyright Elsevier Numéro de notice : A2008-026 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2006.07.026 En ligne : https://doi.org/10.1016/j.rse.2006.07.026 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29021
in Remote sensing of environment > vol 112 n° 1 (15/01/2008) . - pp 75 - 93[article]Acquiring service oriented descriptions of GI processing software from experts [short paper] / Bénédicte Bucher (2008)
PermalinkActes de l'atelier " Systèmes d'Information et de Décision pour l'Environnement" [lors d'INFORSID 2008] / François Pinet (2008)
PermalinkPermalinkAn extensible semantic catalogue for geospatial Web services / Patrick Maué in International Journal of Spatial Data Infrastructures Research, vol 3 (Year 2008)
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PermalinkPermalinkArbeitsgruppe "Automation inder Kartographie, Photogrammetrie und GIS", Tagung 2007 / Bundesamt für Kartographie und Geodäsie (2008)
PermalinkAssessment and socio-economic aspects of Geographic Information Infrastructures / Bastiaan Van Loenen (2008)
PermalinkPermalinkPermalinkLes enjeux juridiques des échanges de données localisées / Centre d'études sur les réseaux, les transports, l'urbanisme et les constructions publiques (2008)
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