University of Southern California

spatial crowdsourcing mobile crowdsourcing crowdsourcing gis location privacy video differential privacy privacy framework spatial matching mobile crowdsensing image disaster response spatial geo-tagged ubiquitious mobile spatial task assignment cloud computing spatial crowdsensing cloaking query optimization histogram cardinality estimation entropy entropy-based histograms estimation error selectivity estimation vgi task matching volunteer geographic information expertise matching crowdsensing complex task task assignment infolab usc metadata first mediaq upload video mobile video cloud benchmark analysis communication data collection multimedia social media