UNIDART workshop 20070220 Metadata

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Published on October 15, 2007

Author: Mentor

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The WMO Metadata Standard:  The WMO Metadata Standard Jürgen Seib Deutscher Wetterdienst e-mail: juergen.seib@dwd.de Contents:  Contents Introduction The ISO 191xx series Multilanguage support WMO extensions to the ISO standard The XML implementation with ISO-19139 WMO Congress XIV (2003):  WMO Congress XIV (2003) “The multiplicity of systems of the different Programmes causes incompatibilities, inefficiencies, duplication of efforts and higher overall costs.” Congress approved the concept of the Future WMO Information System (FWIS), which will provide a single coordinated global infrastructure for the collection and sharing of information in support of all WMO and related international programmes. Concept of WIS:  Concept of WIS National Centres (NC) Data Collection and Production Centres (DCPC) Global Information System Centres (GISC) Data communication network The names of these virtual centres describe their functionality, not the actual organisational entities. There may be organisations, such as NMHSs, which combine all three virtual centres within one facility. The Metadata are the “Core”:  The Metadata are the “Core” What is metadata?:  What is metadata? “Data about data” discovery metadata: describes data usage metadata: how to use data What is a dataset? Geospatial data has a long history using Metadata Maps and Charts Imagery Digital data files Paper Maps:  Title Symbols (Feature Codes) Identification Scale Accuracy Producer Navigation notices Reference system Sources Warnings Location Date Paper Maps Metadata Applications :  To understand the right data for the right purpose  ISO 19115:2003 Metadata Applications Locate Find Discover Evaluate Restrictions Quality Reputation Extract Order Download Employ Apply Use ISO 19115:2003:  ISO 19115:2003 Designed: to support geographic information; to work with wider information technology standards and practices; to serve the global community, in a multi-national, multi-language environment; based on a foundation of national, regional, and special information community standards and experiences Developed through a rigorous, consensus ISO process Scope of ISO 19115:2003:  Scope of ISO 19115:2003 Identifies the metadata required to describe digital geographic data. Metadata is applicable to datasets, dataset series, individual geographic features, and the various classes of objects that compose a feature may be used to describe metadata of other geosciences used as basis for WMO Core Metadata Profile Slide11:  Extract Evaluate Constraint Information Maintenance Information Data Quality Information 19113,14 Content Information 19110, 21, 23 Distribution Information Metadata Extension Information Reference System Information 19108, 11, 12 Spatial Representation Information 19107 Portrayal Catalogue Information 19117 Application Schema Information 19109 Employ Locate Identification Information 19136 ISO 19115:2003 Packages:  ISO 19115:2003 Packages Spatial Representation Information:  Spatial Representation Information ISO 19107 - Spatial schema specifies conceptual schemas for describing the spatial characteristics of geographic features defines standard spatial operations for use in access, query, management, processing, and exchange of geographic information for spatial objects Adopted/Published document Draft document Identification Information:  Identification Information ISO 19136 - Geography Markup Language is an XML encoding in compliance with ISO 19118 for the transport and storage of geographic information supports the description of geospatial application schemas for specialised domains and information communities OGC Geography Markup Language (GML) Adopted/Published document Draft document Reference System Information:  Reference System Information ISO 19108 - Temporal schema defines concepts for describing temporal aspects of metadata ISO 19111 - Spatial referencing by coordinates defines the conceptual schema for the description of spatial referencing by co-ordinates describes the minimum data required to define 1-, 2- and 3-dimensional spatial co-ordinate reference systems ISO 19112 - Spatial referencing by geographic identifiers defines the essential components of a gazetteer defines the conceptual schema for spatial references based on geographic identifiers Adopted/Published document Draft document Application Schema:  Application Schema ISO 19109 - Rules for application schema defines rules for creating and documenting application schemas describes a conceptual modelling of features and their properties from a universe of discourse Adopted/Published document Draft document Content Information:  Content Information ISO 19110 - Feature cataloguing methodology defines the methodology for cataloguing feature types specifies how the classification of feature types is organised into a feature catalogue ISO 19121 - Imagery and gridded data ISO 19123 - Schema for coverage geometry and functions defines a schema for the spatial characteristics of coverages Examples of coverages include rasters, triangulated irregular networks, point coverages, and polygon coverages. ISO 19131 - Data product specification Adopted/Published document Draft document Data Quality Standards:  Data Quality Standards ISO 19113 - Quality principles has created a certain way of classifying and reporting quality ISO 19114 - Quality evaluation procedures gives guidelines for the evaluation of quality ISO 19138 – Data quality measures Adopted/Published document Draft document Portrayal:  Portrayal ISO 19117 – Portrayal defines a method to describe symbols, collections of symbols, and portrayal mappings, which are collections of rules that map features to symbols OGC Styled-Layer Descriptor Adopted/Published document Draft document Multilanguage Support for WMO Metadata:  Multilanguage Support for WMO Metadata WMO has six official languages multilingual metadata is important for WMO <language> and <characterSet> elements of ISO-19115 are default values for the language and the character encoding used in text elements ISO-19115 and ISO-19139 propose extensions for handling multi-language support in text elements WMO Core Metadata Profile v1.0 adopted the ISO-19139 solution Proposal of ISO 19139:  Proposal of ISO 19139 LocalisedCharacterString:  LocalisedCharacterString Can be used instead of <gco:CharacterString> has mandatory attribute locale this attribute references an object that explicitly defines a language and character encoding for text fields Example: <keyword> <LocalisedCharacterString locale=“de”> Lufttemperatur</LocalisedCharacterString> </keyword> PT_FreeText:  PT_FreeText Can be used instead of <gco:CharacterString> possibility to specify translations of a text field into another language Metadata Example:  Metadata Example <keyword> <gco:CharacterString>agriculture</gco:CharacterString> <PT_FreeText> <textGroup> <LocalisedCharacterString locale="fr">agriculture</LocalisedCharacterString> </textGroup> <textGroup> <LocalisedCharacterString locale="es">agricultura</LocalisedCharacterString> </textGroup> <textGroup> <LocalisedCharacterString locale="de">Landwirtschaft</LocalisedCharacterString> </textGroup> </PT_FreeText> </keyword> WMO teams working on metadata:  WMO teams working on metadata CBS Expert Team on Integrated Data Management Geneva (Switzerland), 5.-8. November 2001 Reading (UK), 13.-16. Mai 2002 Geneva (Switzerland), 15.-18. December 2003 Geneva (Switzerland), 1.-3. September 2004 CBS Inter-Programme Expert Team on Metadata Implementation Bejing (China), 26.-30. September 2005 Moscow (Russia), 3.-5. Mai 2006 Metadata Profiles:  Metadata Profiles “A standard related to a community of interest” WMO Core Metadata Profile:  WMO Core Metadata Profile Based on ISO 19115 - Geographic Metadata Version 1.0 is compliant to ISO 19115 Version 1.0 has an XML schema implementation the implementation follows the rules of ISO 19139 2 XML namespaces for WMO extensions of ISO 19115 http://wis.wmo.int/2006/metadata http://wis.wmo.int/2006/catalogues ISO-compliant extensions (1):  Code lists and enumerations List of WMO Topic Categories List of language codes List of coutries Non-geometric vertical co-ordinates Time representation Time issues needed for observations Numerical model related time issues Geological time periods Usage constraints on times ISO-compliant extensions (1) Time relevant to observations:  Time relevant to observations time interval real time axis (t) x issueTime (ti) eventTime (te) Collection period Times relevant to a forecast:  creationTime (tc) Time at which the simulation was executed issueTime (ti) Time at results of the simulation were published / issued real time axis (t) simulation time axis (T) verificationTime (tv) Time of an observed phenomena that the simulation result could be verified against datumTime (td) The ‘origin’ (datum) time used in the simulation Times relevant to a forecast usageStartTime usageExpiryTime Usage period ISO-compliant extensions (2):  ISO-compliant extensions (2) multilingual aspects (adopting ISO-19139 approach) Catalogues and registries station gazetteers multilingual keyword dictionary catalogue of meteorological centres catalogue of meteorological parameters feature catalogues code lists ISO/DTS 19139 – XML Schema implementation of ISO 19115:  ISO/DTS 19139 – XML Schema implementation of ISO 19115 „Given the abstract nature of the ISO 19115 specification, the actual execution of geographic information metadata could vary based on the interpretation of the metadata producers *). In an attempt to facilitate the standardization of implementations, this comprehensive dataset metadata implementation specification provides single UML interpretation and XML schema for carrying out the ISO 19115 metadata standard. This specification is meant to enhance interoperability by providing a common specification for describing, validating and exchanging metadata about geographic datasets, dataset series, individual geographic features, feature attributes, feature types, feature properties, etc.“ *) and it does, see WMO Core Metadata Profile XML vs other XML encodings of ISO 19115 ISO 19139:  ISO 19139 Separate from ISO 19115 Based on Comprehensive Profile ISO 19115 More easily evolve with changes in technology Quickly establish implementation of ISO 19115 XML Schema More rigorous validation of compliance More exact representation of UML Overview of ISO 19139:  Overview of ISO 19139 Composed of three essential parts in the Requirements Clause: ISO 19139 expands Annex E of ISO 19115 to show all the metadata elements (Not XML Specific) ISO 19139 also defines new constraint types to further refine the metadata elements for implementation (Not XML Specific) ISO 19139 defines XML Schema for geographic information dataset metadata (XML Specific) Community profiles may extend schema of ISO 19139 Status: Submitted to ISO as TS (Technical Specification), should be adopted in March 2007

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