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Geospatial Semantic Vocabulary for The National Map

Geospatial Semantic Vocabulary for The National Map. Dalia Varanka, Lynn Usery, and David Mattli GeoVoCamp Washington D.C. June 3-4, 2011. Some Challenges. Great many types of topographic features Sets of spatial relation terms and logical axioms for topographic features do not exist

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Geospatial Semantic Vocabulary for The National Map

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  1. Geospatial Semantic Vocabulary for The National Map Dalia Varanka, Lynn Usery, and David Mattli GeoVoCamp Washington D.C. June 3-4, 2011

  2. Some Challenges • Great many types of topographic features • Sets of spatial relation terms and logical axioms for topographic features do not exist • The vocabulary must serve a wide range of expert and non-expert users

  3. Parameters for Topographic Terms • Topography means the observation and experience of the landscape environment within a proximity • Topographic data represents natural and built features on the surface of the earth • Easily learned basic feature • Features that don’t require a lot of abstract thinking • Scientific applications

  4. Example Query • General Query: Find all other features that cross a given feature • Specific Example: Find all tributaries of West Hunter Creek from the The National Map

  5. Data Conversion • Automated conversion of sample data from The National Map reuses feature codes from digital GIS data models

  6. Topography Semantics • 5 .owl/.n3 files by themes • Each term includes: • Definition • On-line source • Plain English label • URI • (start of) Axiom list

  7. Open Geospatial Consortium Draft GeoSPARQL Specification • OGC Simple Features standard spatial relations based on M. Egenhofer 9-intersection model

  8. Topological Relations • Regional Connection Calculus: relations based on interior, boundary, and exterior contact between two features *disconnected (DC) *externally connected (EC) *equal (EQ) *partially overlapping (PO) *tangential proper part (TPP) *tangential proper part inverse (TPPi) *non-tangential proper part (NTPP) *non-tangential proper part inverse (NTPPi)

  9. Topographic Spatial Relations • Relations from USGS/partner standards

  10. Spatial Analysis of Relations • For any given feature, • Cartographic ‘thumbprint’ of 3 real-world examples • List relations and observations • Compare with verb/preposition pairs • Compile for spatial relation vocabulary

  11. Hypothesis • Topological relations (GeoSPARQL) • Mereological (part-whole) relations • .owl, skos extensions, and others • Study of spatial cognition embedded in prepositions and their match to spatial relation operators

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