Introduction to Controlled Vocabularies (Term / Code Lists)
Controlled Vocabularies What: list of standardised terms to choose from Aim: easier to transfer and interpret data, also allows automated interoperability MEDIN usage: Data Guidelines and Discovery Metadata Standard Vocabularies are available • directly by manual lookup – e. g. Sea. Data. Net • ‘served’ machine to machine - e. g. the NERC Vocabulary Server Re. STful interface
Example – Platform types • Populates the platform. Type field in Detailed Metadata in Data Guidelines
Availability through website www. oceannet. org
Sea. Data. Net client http: //seadatanet. maris 2. nl/v_bodc_vocab_v 2/welcome. asp • Instruments, platforms, sea areas, geometries etc
MEDIN Keywords • Keywords describe certain aspects of your dataset • MEDIN recommends “BODC Parameter Discovery Vocabulary” – P 02
Sea. Data. Net hierarchies Parameter relationships and discovery • How best to choose your P 02 term?
NERC Vocab Service: Located at: http: //vocab. nerc. ac. uk/ Uses Simple Knowledge Organization System (SKOS) concepts to build URLs: • Format is: • http: //vocab. nerc. ac. uk/collection. ID/ collection. Version/status/ • Example: • http: //vocab. nerc. ac. uk/collection/P 02/current/ accepted/ Fully computer readable. Output in XML
Other Useful Vocabularies http: //www. epsg. org/ http: //www. marinespecies. org/msbias/index. php http: //www. ices. dk/datacentre/reco/
How to add? E-mail Sean Gaffney sgaf@bodc. ac. uk - check with appropriate governance group.
Practical Aim – to familiarise yourself with different controlled vocabularies 1) Navigate to the MEDIN webpage for controlled vocabularies www. oceannet. org 2) Find: a) Two different area codes for the Irish Sea (use Sea. Data. Net vocabularies) b) The Aphia. ID for UK species ‘Mytilus edulis’ (use MSBIAS) c) Code for the horizontal coordinate reference system WGS 84 [2 D projection] (use EPSG) d) The entrykey, vocabulary name and associated date for a Keyword for “Man-made Structure” WIN AN AMAZING PRIZE
Answers a)1_4 (using Sea. Vo. X gazeteer) [or 19 using Sea. Data. Net sea areas] * b)140480 c) EPSG: 4326 d) MMST Sea. Data. Net Parameter Discovery Vocabulary date last modified 2008 -01 -30 * - Sea. Vo. X, not Sea. Data. Net sea areas, is the agreed MEDIN vocabulary for water bodies
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