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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/769

Title: Role of ontologies in creating hydrologic metadata
Authors: Bermudez, Luis E.
Piasecki, Michael
Keywords: Metadata;Hydrology--Classification
Issue Date: May-2004
Citation: Paper presented at the Int'l Conference on HydroScience and Engineering, Brisbane, Australia. Retrieved 3/15/2006 from http://www.pages.drexel.edu/~mp29/Publications/Pubs/2004/paper_ICHE2004.pdf.
Abstract: Recent developments and discussions on nationwide scales increasingly stress the need for semantic interoperability among communities due to the lack of specific domain descriptions of the data being processed. These shortcomings are largely based on the fact that each community typically only focuses on its specific needs with little or no attention paid to making these community-specific data descriptions part of a much bigger data realm. We state that part of the problem arises because the formalizations of the available metadata schemas are general, difficult to implement and inflexible to be extended. In this paper we attempt to show that through the use of the Ontology Web Language (OWL) and the creation of domain specific ontologies some of these shortcomings can be overcome. This is demonstrated by creating two examples of knowledge inference to reason from a domain ontology. In the first one we created an ontology for the US Geological Survey Hydrologic Units, where logical inference is use to extract a list of desire watershed names that a user could select to fill a metadata element. In the second example we show the possibilities of extending a metadata element and restricting it to accept values from another distributed resource, such as the Global Change Master Directory (GCMD). We conclude that knowledge representation systems like OWL provide a more flexible platform and possibility to reuse distributed resources, simplifying the process of creating metadata schemas for the hydrologic community.
URI: http://hdl.handle.net/1860/769
Appears in Collections:Faculty Research and Publications (CAEE)

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