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Leverage and Delegation in Developing an Information Model for Geology

Paper on Information modelling, presented at AGU, 2007-12-13

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Leverage and Delegation in Developing an Information Model for Geology

  1. 1. Leverage and Delegation in Developing an Information Model for Geology Simon Cox Research Scientist 14 December 2007
  2. 2. Outline • GeoSciML scope, its community of interest • Methodology & platform: geospatial standards • Delegation within GeoSciML • Extensions from GeoScML • Conclusions
  3. 3. GeoSciML • A language for exchange of geoscience information • UML logical model • XML document format • Scope: interpreted and observed goelogy • MappedFeature, GeologicUnit, GeologicStructure, Fossil, Geologic timescale, Borehole, Observation, etc i.e. information required to maintain geologic maps • More detail: see poster IN53A-0949
  4. 4. E.g. GeologicUnit
  5. 5. E.g. Borehole • More detail: • The GeoSciML Logical Model - IN53A-0949 (poster)
  6. 6. Immediate governance arrangements • IUGS Commission for Geoscience Information • Active participants: • GSC, USGS, BGS, BRGM, SGU, GA, GSV, GSJ, APAT + CSIRO • Documentation + discussion: • https://www.seegrid.csiro.au/twiki/bin/view/CGIModel/GeoSciML • Model and schema: • https://www.seegrid.csiro.au/subversion/GeoSciML/
  7. 7. Framework • Geoscience is largely geospatial → Use geospatial information standards for basic framework • ISO 19100 standards • UML for model design • Standard treatments for geometry, time, fields, coordinate systems • Meta-model for “features” • XML encoding rule – “Geography Markup Language” • OGC information and service models • Standard treatment for Observations & Measurements • Standard http interfaces – WMS, WFS, SOS
  8. 8. E.g. MappedFeature • ISO 19109 Feature Model • ISO 19107 Geometry • ISO 19115 Metadata • OGC 07-002 Sampling Model
  9. 9. Internal delegation • GeoSciML provides data structure • E.g. LithostratigraphicUnit is a kind of GeologicFeature with the properties “preferredAge”, “classifier”, “beddingPattern” etc • Property values are scoped to an explicit scale • i.e. timescale, stratigraphic index, units of measure may use a localized scale or dictionary
  10. 10. E.g. localized vocabularies within standard structures <gsml:ChronostratigraphicUnit> <gml:name>Castlemaine Group - Lancefieldian</gml:name> <gml:name>Ocl</gml:name> <gsml:observationMethod> <gsml:CGI_TermValue> <gsml:value codeSpace="urn:cgi:classifierScheme:GSV:ObservationMethods"> published description</gsml:value> </gsml:CGI_TermValue> </gsml:observationMethod> <gsml:purpose>instance</gsml:purpose> <gsml:rank codeSpace="urn:cgi:classifierScheme:GSV:Rank"> Formation</gsml:rank> ... </gsml:ChronostratigraphicUnit>
  11. 11. Extensibility • Related communities are already building specializations on top of GeoSciML • GroundWaterML – see IN53C-03 • “Aquifer” specializes GeologicUnit • GeochronML – see IN53C-02 • Specialized specimens and observation-procedures
  12. 12. Extensibility methodology • Same pattern as GeoSciML’s specialization of ISO & O&M …
  13. 13. Key points • GeoSciML both uses, and contributes to, a distributed governance framework for geoscience information • UML/XML framework allows delegated governance • UML packages (XML namespaces) reflect system boundaries  discrete governance arrangements • Markup conventions support late-binding of selected elements (esp. vocabularies and scales) • Understand the scope and reach of your community • Only maintain the elements that are: a. important to you b. not governed by someone else • Enable extensions to your model • Publish re-usable components in http repository • e.g. XMI of UML model; XML Schema • Maintain your components in an orderly way • Don’t cause surprises!
  14. 14. Contact Us Phone: 1300 363 400 or +61 3 9545 2176 Email: enquiries@csiro.au Web: www.csiro.au Thank you Exploration & Mining Simon Cox Research Scientist Phone: 08 6436 8639 Email: Simon.Cox@csiro.au Web: www.seegrid.csiro.au

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