Open Geospatial Consortium

The Open Geospatial Consortium ( OGC) is a non-profit organization founded in 1994 as Open GIS Consortium, which has set itself the goal of the development of spatial information processing (especially spatial data ) set on the basis of common standards for interoperability. Here, the OGC membership from government organizations, private industry and universities builds up their membership of the OGC is chargeable. The OGC, in turn, is a member of the 2007 World Wide Web Consortium ( W3C) since January. The registered brand is called OpenGIS.

  • 3.1 Sensor Web Enablement
  • 3.2 OpenGIS Web Services

Members

Currently, the OGC belong to 473 active members, here under well-known distributed as follows States.

USA

Autodesk, ESRI, Intergraph, Google Inc., IBM, Microsoft, NASA, Oracle, MIT.

Austria

AIT, Frequentis, University of Salzburg, Vienna University of Technology.

Switzerland

University of Geneva, ETH Zurich, EPF Lausanne, University of Applied Sciences Northwestern Switzerland

Standards

The development of open standards is based on the basis of freely available specifications, ranging from abstract descriptions of the structure of the components and the operation of a services-based GIS within the meaning of the OGC to detailed specifications for the implementation of the services. Here, however, not the actual implementation of the software is required, but set the different interfaces of a service and its properties and behavior.

The path to these specifications runs over a long process of discussion in the OGC, the result eventually in a " specification " results.

The OGC defines two categories of GIS products, depending on how comprehensively and accurately the software follows the OGC specifications:

  • Implementing Products ("Products in implementation " ) are software products that implement OGC specifications, but have not yet passed conformance testing.
  • Compliant Products ( " Conforming Products") are software products that comply with the specifications of the OGC. If a product is tested and the conformity has been confirmed by OGC Testing Program, the product is automatically listed as " compliant" on the OGC website.

Web Service Framework

With the services-based concept of the OGC to point in the GIS development of monolithic systems to distributed interoperable services ( web services) is effected. Basic services exist both for the visualization of geo- data (eg WMS) as well as for direct access to data in processable form (eg WFS for vector data and WCS for spatio-temporal raster data, etc.).

Sensor Web Enablement

The Sensor Web Enablement initiative expands the Webintegrierung of sensors and sensor networks.

OpenGIS Web Services

The OpenGIS Web Services ( OWS) are, inter alia, counted following services:

  • CSW - Catalog Service, to search for metadata
  • WCS - Web Coverage Service, downloading coverage data (ie, spatio-temporal raster, point cloud, TIN, and mesh data)
  • WFS - Web Feature Service, downloading feature data
  • WMS - Web Map Service, for the visual representation of spatial data as a map

For exchanges, the description and the storage of geometries and the associated attributes of the XML dialect Geography Markup Language (GML ) has been developed.

Interface standards

The " interface standards " (IS, formerly called "Implementation Specifications " ) are detailed technical descriptions of the structure of the individual interfaces. Until the adoption of these specifications, the entire adoption process within the OGC must be traversed.

The following list contains the name of the specification with the corresponding abbreviation (in parentheses) and the current version number.

  • Catalog Interface (CAT ). Version: 1.1.1
  • Coordinate Transformation Services (CT). Version: 1.0
  • Filter Encoding (filter). Version: 1.0
  • Geography Markup Language ( GML3.0 ). Version: 3.0
  • GML 3.2.1 Application schema - coverages. Version: 1.0 - Unified OGC Coverage data model for use by WCS and other interfaces
  • Grid coverages (GC). Version: 1.0 - this specification is obsolete ( deprecated ) and replaced by GMLCOV and WCS
  • Keyhole Markup Language (KML). Version: 2.2
  • Sensor Observation Service Version 1.0
  • Simple Features Access - CORBA ( SFC). Version: 1.0
  • Simple Features Access - SQL ( SFS). Version: 1.1
  • Styled Layer Descriptor (SLD). Version: 1.0
  • Web Catalogue Service (CSW ). Version: 2.0.2
  • Web Coverage Service ( WCS). Version: 2.0 - Modular service for extraction, download and processing of spatio-temporal coverage data
  • Web Feature Service (WFS ). Version: 1.0
  • Web Map Context (WMC ). Version: 1.1
  • Web Map Service ( WMS1.3.0 ). Version: 1.3.0 and 1.1.1
Technical standard Oracle Corporation Austrian Institute of Technology Service (systems architecture) Object Linking and Embedding Web Processing Service
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