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Metadata Standards in CKAN for Pilots in NextGEOSS

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Wolfgang Ksoll

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Metadata Standards in CKAN for Pilots in NextGEOSS

  1. 1. Metadata Standards in CKAN for Pilots Wolfgang Ksoll Viderum February 2018
  2. 2. 1. TITLE / SUBTITLEHow to enrich the search possibilities of the NextGEOSS data hub? Problem: • Several communities need more metadata (essential variables) than schemas of metadata standards like Dublin Core, DCAT, GeoCAT, or ISO provide Solution: • to make more metadata harvestable and searchable the mechanism for “system fields” are used for essential variables
  3. 3. 1. TITLE / SUBTITLEHarvesting and Searching with Metadata in CKAN End User Communities: Civil Society, Government, Business Metadata +Tags DCAT GeoDCAT ISO ITags Data Sources Open Data Resources / Raw Data Harvesting Metadata CKAN Data Hub Interfaces General Engine Metadata Output Numerical intensive Computing Input Pilot Pages Harvesting Metadata Download Datasets Metadata Storing Metadata WWW GUI OpenSearch API • Textual description with links (harvestable for GCI) • Harvested metadata sets with filters, tags,
  4. 4. 1. TITLE / SUBTITLEDublin Core Metadata Standard Schema Element Definition Contributor An entity responsible for making contributions the resource Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource , or the jurisdiction under which the resource is relevant Creator An entity primarily responsible for making the resource Date A point or period of time associated with an event in the lifecycle of the resource Description An account of the resource Format The file format, physical medium or dimensions of the resource Identifier An unambiguous reference to the resource within a given context Language A language of the resource Publisher An entity responsible for making the resource available Relation A related resource Rights Information about rights held in and over the resource Source A related resource from which the described resource is derived Subject The topic of the resource Title A name given to the resource Type The nature or genre of the resource Quoted from: Jeff Pomerantz, Metadata This is an example for a metadata schema. For DCAT, GeoDCAT or ISO schemas look similar
  5. 5. 1. TITLE / SUBTITLEEBV – Essential Biodiversity Variables http://onlinelibrary.wiley.com/doi/10.1111/brv.12359/full From different sources of earth observation essential biodiversity variables (EBV) are created to calculate indicators where biodiversity develops in the wrong direction. The question is how to bring metadata schemas together with these EBVs
  6. 6. 1. TITLE / SUBTITLEMetadata Standard Schemas and Essential <Community> Variables Communities: Climate, Biodiversity, Ocean 1. Climate - Essential Climates Variables ECVs - WIGOS 2. Biodiversity - Essential Biodiversity Variables EBV - GEO BON 3. Ocean - Essential Ocean Variables EOV 4. Additional Metadata of other special communities 5. Essential <Community> Variables in CKAN custom fields e.g. Biodiversity Trivial example to illustrate Metadata with Standard Schemas like Dublin Core, GeoDCAT, ISO 19115, … Long name Element Element Value (range) Nitrogen Content Nitcon 0.5658 mg/ml Biomass BM 3.000 kg –5.000 kg El Niño EN yes Pairs of Elements and Values can be added (associated) to schemas as custom fields in CKAN (Values are text strings only)
  7. 7. 1. TITLE / SUBTITLEHarvesting and Searching with Metadata Schema + Essential <Community> Values Metadata +Tags DCAT GeoDCAT ISO ITags Data Sources Open Data Resources / Raw Data Harvesting Schema CKAN Data Hub Interfaces General Engine Output Numerical intensive Computing Machinelearning Input Pilot Pages Harvesting Metadata Metadata Storing Schema WWW GUI OpenSearch API • Textual description with links (harvestable for GCI) • Harvested metadata sets with filters, tags E<C>V E<C>V E<C>V 1 Essential Variables must be associated to data sources metadata 2 Essential Variables must be associated to pilot output metadata 3 CKAN stores schemas normally and essential variables as custom fields 4 Data from schemas + essential variables can be searched by WWW and API 1 3 4 2
  8. 8. 1. TITLE / SUBTITLENext Steps • Data structures have to be set up (schemas and custom fields) • Data formats for harvesting EBV must be defined an integrated in harvester code • Communication paths have to be defined • Proprietary connector codes for harvesting • OpenSearch-Interface • Other endpoints Wolfgang Ksoll Ksoll@Viderum.com +49 151 1055 9186 Blog: http://wk-blog.wolfgang-ksoll.de/

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