Establishing vocabularies for the exchange of geological map data —how to herd stray cats Linda Bibby, Geo. Science Victoria
How to herd stray cats Introduction GSV: new service delivery model – structured descriptive information – common vocabulary Geological map data exchange – common vocabularies are fundamental A solution? – broader geoscience community
How to herd stray cats A new service delivery model New way to store geological map data – Wider range of richer data – Improved work flows and products – Capture once, store once – Deliver many times, many ways
How to herd stray cats A new service delivery model Significant benefits – Satisfies client demands – Future positioning (e. Science) – Aligns GSV with external developments (Geo. Sci. ML)
How to herd stray cats Geology has no respect for government from Brown & Stephenson, 1991
How to herd stray cats The Brave New World Geo. Sci. ML: a way to exchange digital data – New insights from existing data – A new set of problems – What are we exchanging?
How to herd stray cats Sharing digital data Digital data exchange requires 3 things: – Common data structure – Common delivery method – Common vocabulary
How to herd stray cats The stray cats… ‘…getting geologists to agree… is like trying to herd stray cats!’ — anonymous
How to herd stray cats A simple problem… Name this rock MAFIC ROCK (name based on colour index; observation) BASALT (type of volcanic rock; observation) SCORIA (textural term; observation) THOLEIITE (type of basalt; thin section examination) = THOLEIITIC BASALT (IUGS, 2002) BASANITE (type of volcanic rock; chemical analysis) ROUNDED COBBLE (particle size and shape)
How to herd stray cats The stray cats… Many valid answers Geoscientists constantly test geoscience concepts Healthy and necessary part of a diverse science
How to herd stray cats The Brave New World Risk of losing value caught up in traditional media Computers cannot automatically adjust for: – Preferred terminology – Personal/house styles – Intent of the authors
How to herd stray cats Macedon Volcanic Group Dmg Unnamed Granodiorite porphyry: dark grey; finegrained with phenocrysts of quartz, feldspar, biotite; S-type intrusion. Dmw Willimigongong Ignimbrite Biotite-enstatite rhyodacite ignimbrite: dense blue-black; medium-grained; massive; recrystallised; pyroclastic deposits. Hesket Ignimbrite Rhyolite ignimbrite: red to dark grey; finegrained; vitric-rich; with garnet phenocrysts; densely welded; pyroclastic deposits Dmh from Vanden. Berg, 2005
How to herd stray cats GSV vocabulary Keep the good, improve the bad – Flexible, expandable – Unambiguous, robust – Hierarchical – Understandable by a range of users – International standards vs. user requirements
How to herd stray cats GSV vocabulary Structured descriptive information = Terms + Schemes + Relations – Terms: definitions – Schemes: logical groups of terms – Relations: hierarchy, synonyms
How to herd stray cats GSV vocabulary Geological diversity? – GSV: 16 ways to describe a sandstone! – Hierarchy captures diversity (eliminates spelling mistakes…)
How to herd stray cats GSV vocabulary Old scheme (flat list and free text) arenite psammite arenaceous sand/sandstone sublitharenite sanstone wacke sandstone/quartzite arkosic psammitic sublitharenites subgreywackes quartzwackestone
How to herd stray cats GSV vocabulary Scheme: descriptive rock name clastic rock sandstone (psammite) arenite quartz arenite (orthoquartzite; quartzite) subfeldspathic arenite (arkose) sublithic arenite (sublitharenite) lithic arenite calcarenite wacke (wackestone) quartz wacke (quartzwacke) feldspathic wacke (arkose) lithic wacke (greywacke)
How to herd stray cats GSV vocabulary descriptive name interpretive name rhyolitic rock alkali feldspar rhyolite rhyodacite dacitic rock dacite trachytic rock hyaloclastite peperite agglutinate autobreccia ignimbrite fragmental deposit GSV (after Jackson, 2004) alkali feldspar trachyte quartz alkali feldspar trachyte foid-bearing alkali feldspar trachyte peralkaline trachyte quartz trachyte foid-bearing trachyte latite quartz latite foid-bearing latite after Le Maitre, 2002 (IUGS)
How to herd stray cats GSV vocabulary One solution to a problem – Won’t work for everyone – No single ‘right’ answer – Broader geoscience community are the only group who can endorse standards
How to herd stray cats Herding stray cats? A single, rigid vocabulary is not essential – Accommodate diversity – Encourage debate – Involve the broader community
How to herd stray cats Not impossible Australia is unique – Stratigraphic names database – Draft vocabularies working group – Common vocabulary for Australia – Influence international debate
How to herd stray cats Summary Common vocabularies are essential – No need to enforce single, inflexible terminology – Needs broad support – Australia is a unique environment
How to herd stray cats A word from our sponsor Visit the GSV booth www. dpi. vic. gov. au/minpet/
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