OGC Web Services
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Oblique Images Photogrammetric Products
Octree Quadtree and Octree
OGC deegree Free Software Geography Markup Language (GML) Open Geospatial Consortium
OGC, OGC Simple Features Oracle Spatial, Geometries
OGC Standards, ODBC Smallworld Software Suite
OGC Web Service deegree Free Software
799
OGC Web Services M ARKUS L UPP lat/lon GmbH, Bonn, Germany Synonyms OWS Definition Open Geospatial Consortium (OGC) Web Services (OWS) are services defined by the OGC, allowing all kinds of geospatial functionality. They include services for data access, data display and data processing. OWS requests are defined using the Hyper Text Transfer Protocol (HTTP) protocol and are encoded using key-value-pairs (KVP) structures or Extensible Markup Language (XML). The most widely known OWS is the Web Map Service (WMS). Main Text The currently most important distributed computing platform supported by the OGC is the web, or to be more precise the HTTP. HTTP defines two ways for passing information between clients and services, one of them being HTTP GET, most commonly associated with the KVP encoding and HTTP POST, usually used in conjunction with XML-encoded requests. They can be classified into application services, portrayal services, data services, registry services and processing services [1]. Application services define interfaces for human interaction. Humans use application services to access portrayal, data, registry and processing services. Portrayal (or visualization) services allow the display of geospatial data. Examples for such services are the Web Map Service (WMS) for display of maps and the Web Terrain Services (Web Perspective View Service) for display of three-d
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