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OGC standards play a key
role in SDI
development
Conclusions
These and many other public and private sector organizations and communities are designing and implementing Service Oriented Architectures that specify OGC compliant interfaces to ensure easy sharing of geospatial data and services. The adopted OpenGIS Specifications shown in the sidebar are implemented in many successful products worldwide. Most of the pending specifications, such as Web Gazetteer Services (WGAS) and others mentioned in some of the SDI portraits above are being advance by OGC members to become adopted OpenGIS specifications. Implemented in products, these will provide even more tools to support the non-technical SDI agreements and policies.
Meanwhile, OGC members continue to drive out new standards to tackle a range of interoperability limitations, and to enable geospatial interoperability across product lines, systems and enterprises. Sensor Web Enablement, Web based Decision Support, and CADD / Geospatial integration are just a few of the areas presently being address by OGC members.
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Key OGC Standards Relevant to SDI
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OGC offers 14 adopted geoprocessing standards to enable SDI implementation from the local to global levels. Over 20 more specifications are in various stages of development by Consortium members. Here are some of the relevant standards:
- OpenGIS Simple Features (for CORBA, SQL, and OLE/COM). The Simple Feature Specification application programming interfaces (APIs) provide for publishing, storage, access, and simple operations on Simple Features (point, line, polygon, multi-point, etc).
- OpenGIS Catalog Interface (CAT 2.0) defines a common interface that enables diverse but conformant applications to perform discovery, browse and query operations against distributed and potentially heterogeneous catalog servers.
- OpenGIS Geography Markup Language (GML3.1) is an XML encoding for the transport and storage of geographic information, including both the geometry and properties of geographic features.
- OpenGIS Location Services (OpenLS) consists of the basic services comprising the OpenLS Platform. This platform is also referred to as the GeoMobility Server (GMS), an open location services platform. OpenLS enables, among other things, "roaming" support for location services.
- OpenGIS Styled Layer Descriptor (SLD) is an encoding for how the Web Map Server (WMS 1.0 & 1.1) specification can be extended to allow user-defined symbolization of feature data.
- OpenGIS Web Coverage Service (WCS 1.0) extends the Web Map Server (WMS) interface to allow access to geospatial "coverages" that represent values or properties of geographic locations, rather than WMS generated maps (pictures).
- OpenGIS Web Feature Service (WFS 1.0) describes data manipulation operations on OpenGIS Simple Features (feature instances) such that servers and clients can "communicate" at the feature level.
- OpenGIS Web Map Context Documents (WMC 1.0) provides a standard interface for applications and services that create, store, and use "state" information from a WMS based client application
- OpenGIS Web Map Service (WMS1.3) provides three operations protocols (GetCapabilities, GetMap, and GetFeatureInfo) to support the creation and display of registered and superimposed map-like views of information that come simultaneously from multiple sources that are both remote and heterogeneous.
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