Visualizing ontology mappings to help ontology engineers identify relevant ontologies for their reuse.

The importance of ontologies in biomedicine is increasing in the areas such as the standardization of terminology, the verification of data consistency, and the integration of heterogeneous biomedical databases. New ontologies are being built and added to repositories such as BioPortal. These ontologies represent a large network of biomedical concepts where a single ontology connects a group of closely related concepts. When ontology engineers build new ontologies they often search for existing ontologies to avoid redundancy of concepts. When selecting existing ontologies, engineers consider different factors such as ontology domain, the size of the ontology, and also the relations between ontologies and their concepts. In this paper we present a graph that aims to visualize mappings of all BioPortal ontologies. We believe that this graph can help ontology engineers in deciding which ontology to use when selecting existing concepts for building new ontologies