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Semantic Integration and Its Application to Geospatial Portals Naijun Zhou Assistant Professor

Semantic Integration and Its Application to Geospatial Portals Naijun Zhou Assistant Professor njzhou@umd.edu Department of Geography University of Maryland College Park URL: http://geosemantics.umd.edu/semantics.html. Geospatial Data Portals.

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Semantic Integration and Its Application to Geospatial Portals Naijun Zhou Assistant Professor

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  1. Semantic Integration and Its Application to Geospatial Portals Naijun Zhou Assistant Professor njzhou@umd.edu Department of Geography University of Maryland College Park URL: http://geosemantics.umd.edu/semantics.html

  2. Geospatial Data Portals • A geospatial data portal is a repository of geospatial data, and allows for the geospatialdata sharing and search. search criteria metadata catalog result Geospatial One Stop (GOS), USGS. http://gos2.geodata.gov

  3. Problem Statement • Difficult to pose a query without knowledge of the data content: • which keyword(s) should be used in search? • Datasets will be missed without a consideration of the meaning (semantic) of cropland: • should datasets of grain land, pasture land, agricultural land, etc. be returned or ignored? • Difficult to explore individual datasets: • an integrated view of datasets is needed.

  4. user user search search agricultural agricultural cropland cropland semantic integration semantic integration Merged semantics - Level 0 pasture pasture grain grain Merged semantics - Level 1 data download or query data download or query geospatial geospatial geospatial geospatial geospatial geospatial database database database database database database 1 2 3 A B I II Local semantics Automated semantic integration Hierarchical semantics of land categories Research Goal • Goal: to improve users’ search capability and accuracy • provide an integrated view of land use categories. • support semantic-based search. • browse, explore and search.

  5. Nodes are land categories. Edges indicate semantic similarity. Semantic Network Online demo: http://geosemantics.umd.edu/tglb/tg.html

  6. A bottom-up ontology Categories are clustered and integrated into a tree as an ontology. Online demo: http://geosemantics.umd.edu/applet.html

  7. Acknowledgements • NSF IIS SGER Grant 0751001. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. • Geospatial One Stop. • SpaceTree was developed by Dr. Ben Bederson et al. at the University of Maryland. http://www.cs.umd.edu/hcil/spacetree

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