Results 1 - 10
of
22
On the semantic annotation of places in location-based social networks
- In KDD
, 2011
"... In this paper, we develop a semantic annotation technique for location-based social networks to automatically annotate all places with category tags which are a crucial prerequisite for location search, recommendation services, or data clean-ing. Our annotation algorithm learns a binary support vec- ..."
Abstract
-
Cited by 27 (4 self)
- Add to MetaCart
(Show Context)
In this paper, we develop a semantic annotation technique for location-based social networks to automatically annotate all places with category tags which are a crucial prerequisite for location search, recommendation services, or data clean-ing. Our annotation algorithm learns a binary support vec-tor machine (SVM) classifier for each tag in the tag space to support multi-label classification. Based on the check-in be-havior of users, we extract features of places from i) explicit patterns (EP) of individual places and ii) implicit relatedness (IR) among similar places. The features extracted from EP are summarized from all check-ins at a specific place. The features from IR are derived by building a novel network of related places (NRP) where similar places are linked by vir-tual edges. Upon NRP, we determine the probability of a category tag for each place by exploring the relatedness of places. Finally, we conduct a comprehensive experimental study based on a real dataset collected from a location-based social network, Whrrl. The results demonstrate the suitabil-ity of our approach and show the strength of taking both EP and IR into account in feature extraction.
GeoWordNet: A Resource for Geo-spatial Applications
- in: The Semantic Web: Research and Applications, 7th Extended Semantic Web Conference, ESWC 2010, Heraklion
"... Conference (ESWC) 2010. GeoWordNet: a resource for geo-spatial applications ..."
Abstract
-
Cited by 13 (5 self)
- Add to MetaCart
(Show Context)
Conference (ESWC) 2010. GeoWordNet: a resource for geo-spatial applications
Multi-source Toponym Data Integration and Mediation for a Meta-Gazetteer Service
- in Sara Fabrikant; Tumasch Reichenbacher; Marc van Kreveld & Christoph Schlieder, ed., 'Geographic Information Science', Springer Berlin / Heidelberg
, 2010
"... Abstract. A variety of gazetteers exist based on administrative or user contributed data. Each of these data sources has benefits for particular geographical analysis and information retrieval tasks but none is a one fit all solution. We present a mediation framework to access and integrate distribu ..."
Abstract
-
Cited by 12 (2 self)
- Add to MetaCart
(Show Context)
Abstract. A variety of gazetteers exist based on administrative or user contributed data. Each of these data sources has benefits for particular geographical analysis and information retrieval tasks but none is a one fit all solution. We present a mediation framework to access and integrate distributed gazetteer resources to build a meta-gazetteer that generates augmented versions of place name information. The approach combines different aspects of place name data from multiple gazetteer sources that refer to the same geographic place and employs several similarity metrics to identify equivalent toponyms. 1
T.: Bottom-up gazetteers: Learning from the implicit semantics of geotags
- GeoSpatial Semantics, Third International Conference, GeoS 2009. Volume 5892 of LNCS
, 2009
"... Abstract. As directories of named places, gazetteers link the names to geographic footprints and place types. Most existing gazetteers are managed strictly top-down: entries can only be added or changed by the responsible toponymic authority. The covered vocabulary is therefore often limited to an a ..."
Abstract
-
Cited by 11 (0 self)
- Add to MetaCart
(Show Context)
Abstract. As directories of named places, gazetteers link the names to geographic footprints and place types. Most existing gazetteers are managed strictly top-down: entries can only be added or changed by the responsible toponymic authority. The covered vocabulary is therefore often limited to an administrative view on places, using only official place names. In this paper, we propose a bottom-up approach for gazetteer building based on geotagged photos harvested from the web. We discuss the building blocks of a geotag and how they relate to each other to formally define the notion of a geotag. Based on this formalization, we introduce an extraction process for gazetteer entries that captures the emergent semantics of collections of geotagged photos and provides a group-cognitive perspective on named places. Using an experimental setup based on clustering and filtering algorithms, we demonstrate how to identify place names and assign adequate geographic footprints. The results for three different place names (Soho, Camino de Santiago and Kilimanjaro), representing different geographic feature types, are evaluated and compared to the results obtained from traditional gazetteers. Finally, we sketch how our approach can be combined with other (for example, linguistic) approaches and discuss how such a bottom-up gazetteer can complement existing gazetteers. 1
Tracking Editing Processes in Volunteered Geographic Information: The Case of
"... Abstract. With an increasing number of applications building on Open-StreetMap, data quality is becoming a pressing issue. Data provenance gives useful hints that facilitate data quality assessments based on the features ’ persistence. However, this requires a detailed analysis of the editing histor ..."
Abstract
-
Cited by 9 (2 self)
- Add to MetaCart
(Show Context)
Abstract. With an increasing number of applications building on Open-StreetMap, data quality is becoming a pressing issue. Data provenance gives useful hints that facilitate data quality assessments based on the features ’ persistence. However, this requires a detailed analysis of the editing history and the corresponding contributors. In order to make this provenance information explicit, we introduce a provenance vocabulary for OpenStreetMap and show how to annotate OpenStreetMap data using this vocabulary. We specify the different types of patterns that can be found in the provenance of features. This paper therefore lays the foundation for approaches to assess data quality that build solely on the intrinsic information collected in the OpenStreetMap database, using the trustworthiness of features as a proxy function for data quality.
A transparent semantic enablement layer for the geospatial web
- IN: TERRA COGNITA 2009 WORKSHOP IN CONJUNCTION WITH THE 8TH INTERNATIONAL SEMANTIC WEB CONFERENCE (ISWC
, 2009
"... Building on abstract reference models, the Open Geospatial Consortium (OGC) has established standards for storing, discovering, and processing geographical information. These standards act as basis for the implementation of specific services and Spatial Data Infrastructures (SDI). Research on geo-se ..."
Abstract
-
Cited by 9 (2 self)
- Add to MetaCart
(Show Context)
Building on abstract reference models, the Open Geospatial Consortium (OGC) has established standards for storing, discovering, and processing geographical information. These standards act as basis for the implementation of specific services and Spatial Data Infrastructures (SDI). Research on geo-semantics plays an increasing role to support complex queries and retrieval across heterogeneous information sources, as well as for service orchestration, semantic translation, and on-the-fly integration. So far, this research targets individual solutions or focuses on the Semantic Web, leaving the integration into SDI aside. What is missing is a shared and transparent semantic enablement layer for Spatial Data Infrastructures which also integrates reasoning services known from the Semantic Web. Focusing on Sensor Web Enablement (SWE), we outline how Spatial Data Infrastructures in general can benefit from such a semantic enablement layer. Instead of developing new semantically enabled services from scratch, we propose to create profiles of existing services that implement a transparent mapping between the OGC and the Semantic Web world.
The role of place for the spatial referencing of heritage data
- In: The Cultural Heritage of Historic European Cities and Public Participatory GIS Workshop. The University of
, 2009
"... The workshop on The Cultural Heritage of Historic European Cities and Public Participatory GIS aims at outlining the challenges to develop a ppGIS which can integrate data from different ages, authorities, and formats. This data ranges from archival catalogs, maps, photographs, film, aural archives ..."
Abstract
-
Cited by 9 (4 self)
- Add to MetaCart
(Show Context)
The workshop on The Cultural Heritage of Historic European Cities and Public Participatory GIS aims at outlining the challenges to develop a ppGIS which can integrate data from different ages, authorities, and formats. This data ranges from archival catalogs, maps, photographs, film, aural archives over archaeological data to interpretative studies. With respect to spatial resolution, data should be available down to the level of single streets or even specific properties. Instead of a static approach, users should also be able to contribute new data to the system. This raises a couple of questions which are also relevant in a broader context, namely the ontological representation of and reasoning about geographic places. This paper introduces the challenges of modeling places in such a heterogeneous setting, outlines steps towards a three layered solution on how to represent, reference, and reason about geographic places, and finally sketches how to deal with inconsistent and contradictory knowledge.
Can we Trust Information?- The Case of Volunteered Geographic Information
"... Abstract. In this paper we take a fresh look at the problem of information quality for user contributed content. We assert that the traditional quality criteria for assessing the quality of geographic information are difficult to apply to Volunteered Geographic Information. The notion of information ..."
Abstract
-
Cited by 7 (1 self)
- Add to MetaCart
(Show Context)
Abstract. In this paper we take a fresh look at the problem of information quality for user contributed content. We assert that the traditional quality criteria for assessing the quality of geographic information are difficult to apply to Volunteered Geographic Information. The notion of informational trust is introduced and linked to the established notion of interpersonal trust. We then propose to use informational trust and reputation as proxy measures for information quality and outline the spatial and temporal dimensions of trust that have to be considered. 1
Semantic Enablement for Spatial Data
"... Building on abstract reference models, the Open Geospatial Consortium (OGC) has established standards for storing, discovering, and processing geographical information. These standards act as basis for the implementation of specific services and Spatial Data Infrastructures (SDI). Research on geo-se ..."
Abstract
-
Cited by 2 (0 self)
- Add to MetaCart
(Show Context)
Building on abstract reference models, the Open Geospatial Consortium (OGC) has established standards for storing, discovering, and processing geographical information. These standards act as basis for the implementation of specific services and Spatial Data Infrastructures (SDI). Research on geo-semantics plays an increasing role to support complex queries and retrieval across heterogeneous information sources, as well as for service orchestration, semantic translation, and on-the-fly integration. So far, this research targets individual solutions or focuses on the Semantic Web, leaving the integration into SDI aside. What is missing is a shared and transparent Semantic Enablement Layer for Spatial Data Infrastructures which also integrates reasoning services known from the Semantic Web. Instead of developing new semantically enabled services from scratch, we propose to create profiles of existing services that implement a transparent mapping between the OGC and the Semantic Web world. Finally, we point out how to combine SDI with linked data. 1
Provenance and Trust in Volunteered Geographic Information: The Case of
"... Abstract. We propose to use the trustworthiness of features in Open-StreetMap as a proxy function for data quality, where a feature’s trust value is computed solely from its history. The trustworthiness is based on the different contribution patterns that can be found in a feature’s history, such as ..."
Abstract
-
Cited by 2 (0 self)
- Add to MetaCart
(Show Context)
Abstract. We propose to use the trustworthiness of features in Open-StreetMap as a proxy function for data quality, where a feature’s trust value is computed solely from its history. The trustworthiness is based on the different contribution patterns that can be found in a feature’s history, such as rollbacks or deletions. We argue that these patterns influence the trustworthiness of a feature and its contributors ’ reputation. We discuss different potential implications of the patterns on trust and reputation.