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Spatial Data Infrastructure Concepts and Components

Spatial Data Infrastructure Concepts and Components. Douglas Nebert U.S. Federal Geographic Data Committee Secretariat August 2009. What is a Spatial Data Infrastructure (SDI)?.

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Spatial Data Infrastructure Concepts and Components

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  1. Spatial Data InfrastructureConcepts and Components Douglas Nebert U.S. Federal Geographic Data Committee Secretariat August 2009

  2. What is a Spatial Data Infrastructure (SDI)? “The SDI provides a basis for spatial data discovery, evaluation, and application for users and providers within all levels of government, the commercial sector, the non-profit sector, academia and by citizens in general.” --The SDI Cookbook http://www.gsdi.org

  3. Components of a Spatial Data Infrastructure (SDI) • Policies & Institutional Arrangements (governance, data privacy & security, data sharing, cost recovery) • People (training, professional development, cooperation, outreach) • Data (digital base map, thematic, statistical, place names) • Technology (hardware, software, networks, databases, technical implementation plans)

  4. Here’s an overview of the elements and status of SDI…

  5. Framework GEOdata Partnerships Partnerships Discovery Access Processing Clearinghouse (catalog) Services Metadata Metadata GEOdata Framework Standards Standards

  6. The first task is to inventory who has what data of what type and quality • A standardized form of metadata was published in June 1994 by the US FGDC. An international standard (ISO 19115/19139) now exists and is being adopted by most countries Metadata

  7. Metadata can apply to data, services, and other resource types • Provides documentation of existing internal geospatial resources within an organisation (inventory) • Permits structured search and comparison of held geospatial resources by others (catalog) • Provides end-users with adequate information to take the resource and apply it in an appropriate context (documentation) • ISO 19115/TS19139 provide an international standard for metadata and its encoding

  8. Services Metadata Geospatial Data • Metadata describes data and service resources for order, access, or local use • Metadata is used to describe all types of data, emphasis on ‘truth in labeling’

  9. Framework GEOdata • Special-use thematic layers are built and described as available geospatial data • Common data layers are being defined in the Framework activity Metadata

  10. Framework Data Standards • Eleven abstract data content standards are being promulgated through the ANSI process as American National Standards • Each theme (layer) is also described as XML/GML Application Schemas that can be served over the Web (OGC Web Feature Services)

  11. Scope: Framework Layers • Elevation • Orthoimagery • Hydrographic Data • Governmental Unit Boundaries • Cadastral • Geodetic Control • Transportation • Roads nAir • Rail nMarine • Transit

  12. Interoperability with common Framework data encoding import export System 1 API System 2 API Core Framework Encoding export import WFS System 3

  13. Framework GEOdata The NSDI includes the services to help discover and interact with data Services Metadata

  14. Framework GEOdata An important common service in SDI is that of discovering resources through metadata Discovery Access Processing Services Metadata This Discovery Service is provided by a national catalog of geospatial information which can be accessed by a national portal

  15. National Geo-Portal capabilities • Help locate data and services • Support download of data, link to related websites, and applications for others to access • Support self-organizing communities post and manage selected content • Share data collection plans and requirements to support partnerships and collaboration

  16. Functional Areas in the Portal Search – enables users to find geospatial data Communities – highlight authoritative data sources Featured Resources – highlight maps, applications and websites of current interest

  17. Metadata Publication Options • Users may contribute metadata one of three ways: • Enter metadata into a form on the catalog and they are stored and indexed there • Upload metadata as XML to the catalog from a GIS or metadata program • Register their existing metadata collection or service to be harvested into the national catalog

  18. metadata metadata metadata metadata form entry XML upload search map services data data metadata catalog Portal map viewer data data

  19. Framework GEOdata • A second category of services provides standardised access to geospatial information Discovery Access Processing Services Metadata • This may be made via static files on ftp or via web services. These services deliver ‘raw’ geospatial data, not maps.

  20. form OGC WMS Request OGC WMS Services GeoMedia MapExtreme AutoCAD Oracle Interoperable data access Web Server Native Services Minnesota mapserver Deegree ArcIMS postgreSQL Access ArcSDE Distributed provider organizations

  21. Framework GEOdata A third class of services provides additional processing on geospatial information Discovery Access Processing Services Metadata

  22. Framework GEOdata • Standardization makes SDI work • Standards touch every SDI activity Discovery Access Processing Services Metadata Standards Standards include specifications, formal standards, and documented practices

  23. SDI Suite 1.0 Candidate OGC Web Map Service 1.1.1 OGC Web Feature Service 1.0 OGC Filter Encoding 1.0 OGC Web Coverage Service 1.0 OGC Geography Markup Language 2.1.2 OGC Catalog Services 2.0 Z39.50 Protocol Binding FGDC Content Standard for Digital Geospatial Metadata (CSDGM, 1998) SDI Suite 1.0 Supplemental ISO Metadata Standard 19115 and ISO TS 19139 OGC Geography Markup Language 3.1.1 OGC Styled Layer Descriptor 1.0 OGC Web Map Context 1.1 OGC Catalog Services 2.0 HTTP Protocol Binding, CS-W Candidate “SDI 1.0” Standards

  24. Framework GEOdata Partnerships extend our capabilities Partnerships Discovery Access Processing Services Metadata Standards

  25. Partnerships are the glue... • Proper governance of the community is essential through a variety of roles and responsibilities • National government or NGOs should partner with other levels of government and sectors to promote 2-way coordination • The government or a foundation may be able to fund agencies with “seed” funding to further existing efforts toward common goals • Partnerships extend local capabilities in technology, skills, logistics, and data

  26. Thank you! Doug Nebert US Federal Geographic Data Committee ddnebert@usgs.gov +1 703 648 4151

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