1. ODISEES: A NEW PARADIGM IN DATA ACCESS Atmospheric Science Data Center NASA Langley Research Center Beth Huffer 1 Mike Little 2 John Kusterer 2 Lingua Logica, Denver, CO, United States ASDC, NASA Langley Research Center, Hampton, VA, United States

7. Earth’s Surface Ontology/Semant ic Metadata Repository SPARQL Endpoint Metadata Conversion Tools ECHO/Rev erb ODISEES GUI ASDC Sub- setter Tools End-user Applications iRODS Analytical Tools Other Metadata Other Metadata ESRI Visualization tools REST API HDF/NETCDF Metadata

8. The search tool executes a sequence of SPARQL queries in response to user selections, adding a clause with each selection: SELECT ?x WHERE { ?x :parameter ?p. ?p rdfs:subClassOf } SELECT ?x WHERE { ?x :parameter ?p. ?p rdfs:subClassOf :Radiation. } The first query retrieves all of the data elements for which the parameter is a subclass of the class selected by the user. The user selection is simply substituted in here.

9. SELECT ?x WHERE { ?x :parameter ?p. ?p rdfs:subClassOf :Radiation. ?x } SELECT ?x WHERE { ?x :parameter ?p. ?p rdfs:subClassOf :Radiation. ?x :spectralRange :ShortwaveRadiation } Each time the user makes a selection, an additional clause of the form ?x is added to the query, where the property/value pair reflects the user’s latest selection.

10. Major Challenge How can we populate the metadata repository with the sort of metadata we need to drive our search application?

11. Earth’s Surface Ontology/Semant ic Metadata Repository SPARQL Endpoint Metadata Conversion Tools ECHO/Rev erb ODISEES GUI ASDC Sub- setter Tools End-user Applications iRODS Analytical Tools Other Metadata Other Metadata ESRI Visualization tools REST API HDF/NETCDF Metadata

12. Earth’s Surface Other Metadata Other Metadata HDF/NETCDF Metadata Data set names Temporal extent Instruments Parameter names (  (x is a radiance measurement ) x is made with a CERES instrument) ) (the location of x is 30 KM above the Earth’s surface)) <AtmosphereAt30KM Ontology/Semantic Metadata Repository

13. Earth’s Surface

14. THANK YOU Beth Huffer ebhuffer@nasa.gov beth@lingualogica.net