In typical Wi-Fi based indoor positioning systems employing fingerprint model,plentiful fingerprints need to be trained by trained experts or technician,which extends labor costs and restricts their promotion.In this ...In typical Wi-Fi based indoor positioning systems employing fingerprint model,plentiful fingerprints need to be trained by trained experts or technician,which extends labor costs and restricts their promotion.In this paper,a novel approach based on crowd paths to solve this problem is presented,which collects and constructs automatically fingerprints database for anonymous buildings through common crowd customers.However,the accuracy degradation problem may be introduced as crowd customers are not professional trained and equipped.Therefore,we define two concepts:fixed landmark and hint landmark,to rectify the fingerprint database in the practical system,in which common corridor crossing points serve as fixed landmark and cross point among different crowd paths serve as hint landmark.Machinelearning techniques are utilized for short range approximation around fixed landmarks and fuzzy logic decision technology is applied for searching hint landmarks in crowd traces space.Besides,the particle filter algorithm is also introduced to smooth the sample points in crowd paths.We implemented the approach on off-the-shelf smartphones and evaluate the performance.Experimental results indicate that the approach can availably construct WiFi fingerprint database without reduce the localization accuracy.展开更多
IDE-OTALEX is the first crossborder spatial data infrastructure between contiguous Portuguese （Alentejo and Centro） and Spanish （Extremadura） regions. It was implemented to share official geographic information fr...IDE-OTALEX is the first crossborder spatial data infrastructure between contiguous Portuguese （Alentejo and Centro） and Spanish （Extremadura） regions. It was implemented to share official geographic information from Alentejo and Extremadura, and now Centro region, with everyone. This is the most effective way to have a distributed and flexible system to be used as a territorial observatory for sustainable development and environment protection in these rural and low populated regions. It also contributes to territorial cohesion, one of the tree main pillars of European Cohesion Policy. It＇s characterized for being a distributed, decentralized, modular and collaborative system, based on standards OGC （Open Geospatial Consortium）, W3C （World Wide Web Consortium）, ISO （International Organization for Standardization） and open source technology, developed to guarantee interoperability between the different GIS （Geographic Information System） provided by each project partner. The geoportal is multilingual （Portuguese, Spanish and English） and integrates a Map viewer, Metadata Catalogue and Gazetteer. It consists in central and local nodes which communicate through WMS （Web Map Services）, CSW （Catalogue Service Web） and WFS （Web Feature Services）. It is now implementing SOS （Sensor Observation Services） and WPS （Web Map Processing）. The geographic information available results of an extensive work of data harmonisation adapted to INSPIRE Directive （D 2007/2/EC, the European Parliament and Council, March 14, 2007）. It integrates basic cartography, socio-economic, territorial and environmental indicators.展开更多
基金partially sponsored by National Key Project of China (No.2012ZX03001013-003)
文摘In typical Wi-Fi based indoor positioning systems employing fingerprint model,plentiful fingerprints need to be trained by trained experts or technician,which extends labor costs and restricts their promotion.In this paper,a novel approach based on crowd paths to solve this problem is presented,which collects and constructs automatically fingerprints database for anonymous buildings through common crowd customers.However,the accuracy degradation problem may be introduced as crowd customers are not professional trained and equipped.Therefore,we define two concepts:fixed landmark and hint landmark,to rectify the fingerprint database in the practical system,in which common corridor crossing points serve as fixed landmark and cross point among different crowd paths serve as hint landmark.Machinelearning techniques are utilized for short range approximation around fixed landmarks and fuzzy logic decision technology is applied for searching hint landmarks in crowd traces space.Besides,the particle filter algorithm is also introduced to smooth the sample points in crowd paths.We implemented the approach on off-the-shelf smartphones and evaluate the performance.Experimental results indicate that the approach can availably construct WiFi fingerprint database without reduce the localization accuracy.
文摘IDE-OTALEX is the first crossborder spatial data infrastructure between contiguous Portuguese （Alentejo and Centro） and Spanish （Extremadura） regions. It was implemented to share official geographic information from Alentejo and Extremadura, and now Centro region, with everyone. This is the most effective way to have a distributed and flexible system to be used as a territorial observatory for sustainable development and environment protection in these rural and low populated regions. It also contributes to territorial cohesion, one of the tree main pillars of European Cohesion Policy. It＇s characterized for being a distributed, decentralized, modular and collaborative system, based on standards OGC （Open Geospatial Consortium）, W3C （World Wide Web Consortium）, ISO （International Organization for Standardization） and open source technology, developed to guarantee interoperability between the different GIS （Geographic Information System） provided by each project partner. The geoportal is multilingual （Portuguese, Spanish and English） and integrates a Map viewer, Metadata Catalogue and Gazetteer. It consists in central and local nodes which communicate through WMS （Web Map Services）, CSW （Catalogue Service Web） and WFS （Web Feature Services）. It is now implementing SOS （Sensor Observation Services） and WPS （Web Map Processing）. The geographic information available results of an extensive work of data harmonisation adapted to INSPIRE Directive （D 2007/2/EC, the European Parliament and Council, March 14, 2007）. It integrates basic cartography, socio-economic, territorial and environmental indicators.
