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We review existing query answering systems for sensor data. We then propose an extended query answering approach termed smart query, specifically for marine sensor data. The smart query answering system integrates pattern queries and continuous queries. The proposed smart query system considers both streaming data and historical data from marine sensor networks. The smart query also uses query relaxation technique and semantics from domain knowledge as a recommender system. The proposed smartdoi:10.3390/s110302885 pmid:22163772 pmcid:PMC3231582 fatcat:h4jwjqhlrfgthhwwsr6irmwi6a