Having encoded in RDF main components related to observing systems, sensors an observations could help infer and discover sensors and observations of interest. Having these information in RDF will allow to add rules and axioms and leverage tools already created for the semantic web

Approach: An SOS service contains information about observing systems, sensors an observations. These information is repeated sometimes across SOS responses. An SOS contains three main interfaces: getCapabilities, describeSensor and getObservation. The OOSTethys catalog summarizes the information of the services by processing the getCapabilities and the describeSensor request. The summary is available in XML here: http://score.itsc.uah.edu/MMI/GetURLs.pl. Then we process this information and converted to RDF via XSLT uahtoowl.xslt. An example RDF of the result is here. This RDF will be map to other ontologies, like the MMI platforms ontology, GCMD or IOOS variables to demonstrate the semantic interoperability approach.