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In view of existing structure heterogeneous and semantic heterogeneous, a multi-source data integration approach based on ontology is proposed. In this approach, constructed domain ontologies are used to describe data sources, and semantic integration for multisource data is realized by using an information integration toolkit named KARMA to map multiple datasets to RDF data. By analyzing Food and Agriculture Organization (FAO)'s indicator datasets and World Health Organization (WHO)'sdoi:10.14257/ijunesst.2016.9.9.09 fatcat:kqiwlni6grfszfu7we7mqus7ta