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London 26-27 January 2005

London 26-27 January 2005. Achieving Network Enabled Capabilities through the Definition, Understanding and Dissemination of Metadata. Olaf Østensen Chairman of ISO/TC 211 Geographic information/Geomatics Norwegian Mapping and Cadastre Authority.

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London 26-27 January 2005

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  1. London26-27 January 2005 Achieving Network Enabled Capabilities through the Definition, Understanding and Dissemination of Metadata Olaf ØstensenChairman of ISO/TC 211 Geographic information/GeomaticsNorwegian Mapping and Cadastre Authority

  2. The fundament of geospatial technology in the networked age … INTEROPERABILITY and metadata is necessary to achieve interoperability • semantic interoperability (understanding the information) • technical interoperability (e.g. enabling interfaces to communicate)

  3. What is metadata ? • “Data about Data” • “provides information about the identification, the extent, the quality, the spatial and temporal schema, spatial reference, and distribution of digital geographic data” • Ensures the right data for the right purpose • Ensures that information is used correctly Geospatial data has a long history using Metadata

  4. Identification Paper Maps Symbols Date Sources Producer Title Reference system Navigation notices Scale Accuracy Location

  5. Aerial Photos Date Location Originator Altitude Obliqueness Identifiers Time Focal length

  6. If we do not know the metadata… • how can we know the currency? • how can we know the accuracy? • how can we know the completeness? • …. • …. HOW CAN WE TRUST THE INFORMATION?

  7. Up to now … • we have known the producer • we have known the data series • we had an overall view of currency, quality and completeness with the networked services, all this is changing …

  8. In the networked age … • a vast amount of data that can be downloaded • more important, an enormous amount of geospatial services that we can connect to METADATA AND METADATA UNDERSTANDING BECOMES MANDATORY!

  9. Service A with interface Service B with interface Service C with interface Service Z with interface Metadata is necessary ! Metadata - datasets Metadata - services a variety of content,reference and thematicdata a rich set of functionality- services a variety of appli-cations …

  10. User Environment • Understand the Model • How features are represented • Connectivity • Understand the Content • Why features are included or excluded • Understand the Point-of-View • Business/Commercial • Environmental/Scientific • Military/Defense/Intel Pleasantville Pleasantville Pleasantville

  11. Processing Environment • Support user Decisions • Identify multiple datasets within an application • Know the good and bad areas • Merging data (which is the better data?) • Currentness • Quality • Support Computer Processing • Application software functions • Capabilities, access • Guide software through the data

  12. Archive Query, Discover End User Publish Services 1. Create Content Catalog Portal 2. Catalog 3. Publish 4. Discover Metadata 5. Use/Access Catalog Create Data and Services 6. Archive Metadata - Supporting Geographic Dataand Services Life Cycle

  13. Metadata perspectives • Why is metadata more important now? • Expansion in the use of Geographic Information • Proliferation of data • Non-geographers using geospatial data • The producer is not the user • Geospatial data is imperfect • A model, a “point of view” • Assumptions, limitations, approximations, simplifications • Geospatial data is expensive • Reuse • Data management • Why should it be standardized? • Provide an understanding of data – around the Globe and across information communities

  14. ISO 19115:2003

  15. ISO - the International Organization for Standardization • a NGO based in Geneva • established in 1947 • the authorized publisher of global standards • published more than 14 000 standards (e.g. ISO 9000- and ISO 14000-series) • based upon national membership – 148 countries participate

  16. ISO 19115:2003Scope • ...the schema required for describing geographic information and services • ...information about the identification, the extent, the quality, the spatial and temporal schema, spatial reference, and distribution of digital geographic data • ...applicable to the cataloguing of datasets, clearinghouse activities, and the full description of datasets for a wide range of geographic applications • …applicable to geographic datasets, dataset series, and individual geographic features and attributes • ...may be used for other forms of geographic data such as map, charts, textual documents

  17. 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 • Provides a foundation for national, regional, and global interoperability Semantic Interoperability

  18. ISO 19115:2003 Metadata applications FeatureType DataSet 0..* 0..* 1..* 0..* Metadata Feature 0..* 1..* 1..* 0..* PropertyType 0..* 0..* 0..* Aggregate DataSet FeatureAttribute 0..* Initiative OtherAssociation Series Platform Sensor ProductionSeries StereoMate

  19. Dataset title Dataset reference date Dataset responsible party Geographic location of the dataset (by four coordinates or by geographic identifiers) Dataset language Dataset character set Dataset topic category Spatial Resolution Abstract describing the dataset Distribution format Additional extent information (vertical and temporal) Spatial representation type Reference system Lineage statement On-line resource Metadata file identifier Metadata standard name Metadata standard version Metadata language Metadata character set Metadata point of contact Metadata time stamp Recommended core metadata for geographic datasets • Mandatory

  20. Other metadata standards under work • ISO/TS 19139 Geographic Information – Metadata – XML Schema Specification • ISO 19115-2 Geographic Information – Metadata – Part 2 Extensions for Imagery and Gridded Data

  21. ISO 19115-2 Geographic Information – Metadata – Part 2 Extensions for Imagery and Gridded Data • Scope • This International Standard extends ISO 19115:2003 Geographic Information – Metadata by defining the schema and additional metadata required for imagery and gridded data

  22. ISO 19139Geographic Information – Metadata – XML Schema Implementation • Defines spatial metadata XML (smXML) encoding • an XML Schema implementation derived from ISO 19115-Geographic information – Metadata • XML Schema • More rigorous validation of compliance • More exact representation of UML • Based on Comprehensive Profile ISO 19115 • Separate from ISO 19115 • More easily evolve with changes in technology • Quickly establish implementation of ISO 19115 Technical Interoperability

  23. Liaison Organizations and Related Work Commercial SPOT National participation Consortium IEEE ISPRS WMO ISO 19115 - 2 Imagery Extensions FGDC/NASA Metadata Remote Sensing Extensions ISO 19115:2003 IHO S-57 Edition 4 SMPTE JTC1/SC24 ISO/IEC 12087-5 BIIF

  24. Metadata Portals • Portal – gateway, place of entry • Producers • Advertise, expose products • Share information about holdings • Provide an understanding of data and services • Users • Perform efficient searches by requirements • Discover data and services • Determine fitness for use • Acquire access information

  25. What are users looking for? • Data for use in GIS software • GIS Services - mapping, geoprocessing • Geospatial applications • Planned data acquisitions • Events, activities and information A metadata portal contains metadata for all of the above

  26. Metadata and INSPIRE Directive (proposal) Article 7 Member States shall establish and operate infrastructures for spatial information in accordance with this Directive. Chapter II Metadata Article 8 1. Member States shall ensure that metadata are created for spatial data sets and services, and that those metadata are kept up to date. 2. Metadata shall include information on the following: …… 3. Member States shall take the necessary measures to ensure that metadata are complete and of high quality.

  27. Metadata and INSPIRE Directive (proposal) Article 18 1. Member States shall establish and operate a network of the following services for the spatial data sets and services for which metadata have been created in accordance with this Directive: (a) discovery services making it possible to search for spatial data sets and spatial data services on the basis of the content of the corresponding metadata and to display the content of the metadata; (b) view services making it possible, as a minimum, to display, navigate, zoom in/out, pan, or overlay spatial data sets and to display legend information and any relevant content of metadata; (c) download services, enabling copies of complete spatial data sets, or of parts of such sets, to be downloaded; (d) transformation services, enabling spatial data sets to be transformed; (e) “invoke spatial data services” services, enabling data services to be invoked. Those services shall be easy to use and accessible via the Internet or any other appropriate means of telecommunication available to the public.

  28. Users Connect and Use Download and use Search Catalog and Find GIS Web Services Providers Publish GIS data and services Document in catalog Portal FTP GIS Data Providers GIS Data GIS Data GIS Data Geospatial Portal Architecture OGC Catalog Services (Z39.50 CS-W) OGC WMS, WFS, WCS Mif, Shp . . . OAI Protocol for Metadata Harvesting ISO 19115 Metadata/ ISO 19139 Metadata Implementation Specification

  29. Gazetteer Category Data Index Map What is a metadata portal? Search & Navigation View Spatial Users Categories Thesaurus Supporting Data Sets Metadata Publishers Partners Service broker

  30. Metadata Server Internet Exposing Metadata Discover Author Publish

  31. Clearinghouse Z39.50 Catalog Searching for Geospatial Data Portal browser Metadata Explorer Metadata Catalog

  32. Searching MetadataThrough a Portal

  33. ISO TC 211 is taking the next steps Expanding for imagery Implementation specification Technical interoperability Metadata Portals Fast, direct access Increased & easy participation Key lifecycle component Standards based tools make it easy Many flavors of interoperability Metadata – a key factor enabling interoperability Essential for all aspects of spatial data handling Locate Evaluate Extract Employ Metadata in the ISO 19115 standard Semantic interoperability Provides a common understanding Expanded networks Global Interoperability SummaryISO Metadata

  34. metadata supports assessment of information on the internet metadata is necessary for connecting to network services (e.g. wms, wfs, wcs, … ) metadata is a necessary – although not sufficient – condition to trust information in the networked environment! Summary

  35. Thank you ! … also thanks to David Danko, project leader in metadata in ISO/TC 211 for providing input to this presentation

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