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Auteur Robert Lemmens |
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Affiner la recherche Interroger des sources externesModeling aggregated expertise of user contributions to assess the credibility of OpenStreetMap features / Bani Idham Muttaqien in Transactions in GIS, vol 22 n° 3 (June 2018)
Titre : Modeling aggregated expertise of user contributions to assess the credibility of OpenStreetMap features Type de document : Article/Communication Auteurs : Bani Idham Muttaqien, Auteur ; Franck O. Ostermann, Auteur ; Robert Lemmens, Auteur Année de publication : 2018 Article en page(s) : pp 823 - 841 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] contenu généré par les utilisateurs
[Termes IGN] données localisées des bénévoles
[Termes IGN] expertise
[Termes IGN] fiabilité des données
[Termes IGN] OpenStreetMap
[Termes IGN] qualité des données
[Termes IGN] utilisateur civilRésumé : (Auteur) The emergence of volunteered geographic information (VGI) during the past decade has fueled a wide range of research and applications. The assessment of VGI quality and fitness‐of‐use is still a challenge because of the non‐standardized and crowdsourced data collection process, as well as the unknown skill and motivation of the contributors. However, the frequent approach of assessing VGI quality against external data sources using ISO quality standard measures is problematic because of a frequent lack of available external (reference) data, and because for certain types of features, VGI might be more up‐to‐date than the reference data. Therefore, a VGI‐intrinsic measure of quality is highly desirable. This study proposes such an intrinsic measure of quality by developing the concept of aggregated expertise based on the characteristics of a feature's contributors. The article further operationalizes this concept and examines its feasibility through a case study using OpenStreetMap (OSM). The comparison of model OSM feature quality with information from a field survey demonstrates the successful implementation of this novel approach. Numéro de notice : A2018-580 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12454 Date de publication en ligne : 17/08/2018 En ligne : https://doi.org/10.1111/tgis.12454 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92328
in Transactions in GIS > vol 22 n° 3 (June 2018) . - pp 823 - 841[article]European handbook of crowdsourced geographic information, ch. 10. Enhancing the management of quality of VGI: contributions from context and task modelling / Bénédicte Bucher (2016)
Titre de série : European handbook of crowdsourced geographic information, ch. 10 Titre : Enhancing the management of quality of VGI: contributions from context and task modelling Type de document : Chapitre/Contribution Auteurs : Bénédicte Bucher Editeur : Londres : Ubiquity press Année de publication : 2016 Importance : pp 131 - 142 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] données localisées des bénévoles
[Termes IGN] modèle orienté agent
[Termes IGN] prise en compte du contexte
[Termes IGN] qualité des données
[Termes IGN] spécification de produit
[Termes IGN] utilisateur civilRésumé : (auteur) This chapter presents contributions to managing the quality of Volunteered Geographical Information (VGI) and of crowd sourced geographical information (CSGI) brought by the representation of specific knowledge items: task and context. Task and context modeling have been studied in different communities. We propose an approach for integrating their results with the perspective of improving the quality management of VGI and CSGI. Numéro de notice : H2016-002 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Chapître / contribution nature-HAL : ChOuvrScient DOI : 10.5334/bax En ligne : https://doi.org/10.5334/bax Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83783 Documents numériques
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Enhancing the management of quality of VGIAdobe Acrobat PDF
Titre de série : European handbook of crowdsourced geographic information, ch. 14 Titre : Querying VGI by semantic enrichment Type de document : Chapitre/Contribution Auteurs : Robert Lemmens, Auteur ; Gilles Falquet, Auteur ; Stefano de Sabbata, Auteur ; Bin Jiang, Auteur ; Bénédicte Bucher Editeur : Londres : Ubiquity press Année de publication : 2016 Importance : pp 185 - 194 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] données hétérogènes
[Termes IGN] données localisées des bénévoles
[Termes IGN] enrichissement sémantique
[Termes IGN] folksonomie
[Termes IGN] langage naturel (informatique)
[Termes IGN] ontologie
[Termes IGN] OpenStreetMap
[Termes IGN] recherche d'information géographique
[Termes IGN] requête (informatique)Résumé : (auteur) Volunteered geographic information (VGI) plays an increasing role in current geodata provision. At the same time, due to its lack of structure, it is hard to use as meaningful input in software applications. In this chapter, we embark upon the unstructured character of VGI and on ways to enrich the structure in order to make it suitable for information retrieval. We describe the characteristics of semantic enrichment and explain how folksonomies and ontologies play a role. We believe that they represent different levels of formality in a semantic reference space and determine the richness of the information retrieval. Numéro de notice : H2016-004 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Autre URL associée : vers HAL Thématique : GEOMATIQUE Nature : Chapître / contribution nature-HAL : ChOuvrScient DOI : 10.5334/bax En ligne : https://doi.org/10.5334/bax Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83786 Documents numériques
en open access
Querying VGI by semantic enrichmentAdobe Acrobat PDF
Titre : An ontology-based approach to incorporate user-generated geo-content into SDI Type de document : Article/Communication Auteurs : D.P. Deng, Auteur ; Robert Lemmens, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 20/10/2011 Conférence : ISPRS 2011, WG IV/1, IV/2, IV/4, IV/5, WG IV/7, ICWG IV/VIII Geospatial Data Infrastructure: from data acquisition and updating to smarter services 20/10/2011 21/10/2011 Guilin Chine OA ISPRS Archives Importance : 6 p. ; pp 38 - 43 Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] catastrophe naturelle
[Termes IGN] contenu généré par les utilisateurs
[Termes IGN] données issues des réseaux sociaux
[Termes IGN] exploration de données
[Termes IGN] hétérogénéité sémantique
[Termes IGN] Japon
[Termes IGN] ontologie
[Termes IGN] trace numériqueRésumé : (Auteur) The Web is changing the way people share and communicate information because of emergence of various Web technologies, which enable people to contribute information on the Web. User-Generated Geo-Content (UGGC) is a potential resource of geographic information. Due to the different production methods, UGGC often cannot fit in geographic information model. There is a semantic gap between UGGC and formal geographic information. To integrate UGGC into geographic information, this study conducts an ontology-based process to bridge this semantic gap. This ontology-based process includes five steps: Collection, Extraction, Formalization, Mapping, and Deployment. In addition, this study implements this process on Twitter messages, which is relevant to Japan Earthquake disaster. By using this process, we extract disaster relief information from Twitter messages, and develop a knowledge base for GeoSPARQL queries in disaster relief information. Numéro de notice : C2011-055 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication DOI : 10.5194/isprsarchives-XXXVIII-4-W25-38-2011 En ligne : http://dx.doi.org/10.5194/isprsarchives-XXXVIII-4-W25-38-2011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64360
Titre : Semantic interoperability of distributed geo-services Type de document : Thèse/HDR Auteurs : Robert Lemmens, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2006 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 63 Importance : 291 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-90-6132-298-6 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] architecture client-serveur
[Termes IGN] base de connaissances
[Termes IGN] diffusion de données
[Termes IGN] hétérogénéité sémantique
[Termes IGN] infrastructure mondiale des données localisées
[Termes IGN] intégration de données
[Termes IGN] interopérabilité sémantique
[Termes IGN] logiciel libre
[Termes IGN] modèle sémantique de données
[Termes IGN] ontologie
[Termes IGN] OWL
[Termes IGN] prototype
[Termes IGN] réseau sémantique
[Termes IGN] service de géoinformation
[Termes IGN] service fondé sur la position
[Termes IGN] service web géographique
[Termes IGN] système d'information géographiqueRésumé : (Auteur) The last two decades have shown a major shift from stand-alone software systems to networked ones. As with all information system domains, Geographic Information Systems (GISs) have been influenced to a large extent by recent internet developments, resulting in an increasing availability of client/server applications using distributed geo-(web-)services, such as interactive maps, route planners and gazetteers. There is an increasing need for organisations to perform on demand geo-processing tasks by integrating and reusing geo-information and geo-services from within and outside the organisation. These activities are typically performed in the context of so called Geo-Information Infrastructures (GIls).
The process of integrating services is commonly referred to as service chaining. This requires that services can be easily found, and that they are executable and interoperable. Interoperability means that the services 'understand' each other's messages. A major impediment is formed by the semantic heterogeneity (the differences in meaning) of geo-information and of the functionality of geo-services. Making services semantically interoperable is an important prerequisite for information sharing in today's networked society. This involves services that rely on different knowledge domains, one of which is the geo-information domain.
Within this context, the research presented in this thesis provides solutions for the computer-aided integration of distributed heterogeneous geo-information and geo-services, based on their semantics (the meaning of their content).
Geo-information distinguishes from other information by its spatial relevance. Geo-services often have to deal integrally with multiple-representations of features in a spatial, temporal and thematic dimension. Geo-services are also implicitly connected by the geographic location of the features they process. This has implications for the interoperability of geo-services. For example, the validity of a service (e.g., a routeplanner) may be bound to a specific geographic area, which could imply it cannot be used in combination with services involving another validity area. On the contrary, services that seem to be incompatible due to differences in feature representation (e.g., geometry, coordinate reference system), may turn out to be useful in combination, because they contain information on the same locations.
On demand geo-processing requires services and the meta-information that describes the services to be available at the time a task is being executed. Moreover, the service descriptions should be based on commonly agreed rules for service characterisation. Inter-service contracts that contain such rules may result in service interoperability and this can be achieved at three levels: syntax, structure and semantics. The influential specifications of the Open Geospatial Consortium (OGC) and the ISO 19100 series of standards, implement formal contracts on the syntactical and structural level, but they prescribe only informal contracting at the semantic level. Despite their rigid conceptualisation, they lack a machine-accessible formalisation that supports the specification of semantics for geo-information and geo-services. This research has developed such a formalisation, which is specified in a so called semantic interoperability framework. In this framework a key role is played by machine ontologies, which are machine-accessible representations of knowledge that are used for inferring intra- and inter-resource relationships. Recent research efforts in the field of the Semantic Web have contributed considerably to the deployment of ontology-based applications by providing a theoretical foundation (Description Logics), ontology languages (e.g., the Web Ontology Language (OWL)), and tools for ontology creation, access and reasoning with web-based (machine) ontologies. The power of web-based ontologies lies in their interoperable (XML based) representation, the use of unique namespaces and the fact that they allow for automated reasoning.
The semantic interoperability framework developed in this research, contains (1) geo-information modelling ontologies which are based on the ISO General Feature Model, (2) domain specific ontologies (amongst others, one which is based on a data model used by the Dutch Topographic Service), and (3) a geo-operation modelling ontology. The latter is based on a geo-operation taxonomy, an input/output parameter characterisation and a workflow model. The taxonomy and parameter characterisation have been developed as part of this research, the workflow model is based on OWL-S, an OWL-based upper ontology for web services.
Ontology-based service descriptions have been created in the context of four use cases in the following areas: (1) information model integration for risk mapping, (2) ad hoc data integration in a disaster emergency situation, (3) reuse of geo-data and geo-services in scientific research, and (4) ad hoc integration of travel services. The ontology-based descriptions are used as representations of service requests and advertisements in a matchmaking process. The matchmaking is performed by an ontology reasoner which can infer implicit relationships that exist in a knowledge base containing service descriptions as sets of concepts. The reasoner is implemented together with the ontologies in a prototype environment. Except for the reasoner, this has been carried out with open source software. Within this environment, basic matchmaking has been successfully performed to support data set integration and service chaining. This has been demonstrated by tests implementing the aforementioned use cases.
The offered solution is flexible and extensible. With respect to flexibility, the research demonstrates the use of incomplete service descriptions. With respect to extensibility, the research shows how service descriptions can be extended with new concepts. It is also demonstrated how existing application domains can be linked through ontology mappings. In the process of service chaining, four steps have been identified, i.e., discovery, abstract composition, concrete composition and execution. The link between the abstract and concrete composition of services is realised by annotation, which connects ontology elements with parameters of executable code. For one of the use cases, this code has been deployed in a prototype software application (the latter being part of an external research effort).
There are also limitations to the approach followed, which are partly due to the limitations of OWL and reasoning with it, i.e., with respect to spatial reasoning and the use of metaclasses. In addition, the current prototype environment has several shortcomings: (1) constraints of the user-interfaces (entering service descriptions in Description Logics is still rather complex), (2) the inflexibility of the reasoning implementation and (3) the incompleteness of mappings between domain ontologies, all of which are thought to be surmountable.
A number of recommendations are made for the improvement of the current design and implementation of the interoperability framework, such as the incorporation of: meta-information propagation, concept similarity quantifiers and result ranking in the matchmaking process. The deployment of the approach requires key organisations such as OGC to develop and maintain domain independent parts of a semantic interoperability framework and organisations with a GIl mandate to manage its domain dependent parts.
Application fields that are thought to benefit from the presented approach in the short term are, amongst others: service discovery and chaining in GII, harmonisation of geo-information models, multiple-representation of geo-information, profile matching of geo-service users, documentation of geo-processing history (lineage), and quality assessment of meta-information. The target groups of this research are firstly geo-information engineers who are confronted with information integration issues and service interoperability issues, and secondly, information engineers in general confronted with distributed information and with end users that need to access distributed services as one virtual application.Note de contenu : 1 Why interoperability is important
1.1 Research context and motivation
1.2 Research objectives
1.3 Research approach
1.4 Related work
1.5 Thesis outline
2 Interoperable distributed services
2.1 Distributed processing paradigms
2.2 Interoperability and heterogeneity
2.3 Overcoming heterogeneity by contract
2.4 Interoperability models
2.5 Geo-services
2.6 Geo-service use cases
2.7 Summary and reflection
3 Service models for discovery, composition and execution
3.1 Information modelling
3.2 Process modelling
3.3 Service chaining
3.4 Summary and reflection
4 Semantic modelling
4.1 What is an ontology?
4.2 Foundations for machine ontology
4.3 Ontology design and creation
4.4 Ontology representations and notation
4.5 Reasoning with a knowledge base
4.6 Semantic interoperability frameworks
4.7 Semantic web services
4.8 Geo-semantic modelling and spatial relevance
4.9 Summary and reflection
5 Semantic interoperability framework for geo-services
5.1 Semantic framework overview
5.2 Feature symbol ontology
5.3 Feature concept ontologies
5.4 Geo-operation characterisations ? OPERA
5.5 OPERA-R ? Feature processing operations
5.6 Geo-service descriptions
5.7 Summary and reflection
6 Geo-information matching and service chaining
6.1 Example: Riskmap chain
6.2 Semantic modelling of geo-service chains
6.3 Derived operations and ontology mappings
6.4 Matchmaking
6.5 Summary and reflection
7 Use case implementations
7.1 Riskmap NL
7.2 Emergency 112
7.3 Research Net
7.4 Travel Google
7.5 Summary and reflection
8 Implementation of prototypes: OnToGeo and GeoMatchMaker
8.1 Practical design and implementation issues of OnToGeo
8.2 Workbench tools
8.3 GeoMatchMaker, an integrated prototype
8.4 Creating service descriptions
8.5 Summary and reflection
9 Conclusions and recommendations
9.1 Summary and reflection
9.2 Conclusions
9.3 Main contributions
9.4 Deployment
9.5 Recommendations for further workNuméro de notice : 15204 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Thèse étrangère En ligne : https://www.ncgeo.nl/downloads/63Lemmens.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55094 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 15204-01 37.00 Livre Centre de documentation Géomatique Disponible 15204-02 37.00 Livre Centre de documentation Géomatique Disponible Dynamic GPS height determination in the decimeter level for bathymetric applications / Robert Lemmens (1993)
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