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Part III. Appendix 2: Data TransportAnnex D: OpenGIS BasicService Model ReviewINTRODUCTIONThe following review of specifications targets the OpenGIS Basic Service Model (BSM) as the basisfor comparison with OPeNDAP/NVODS. The BSM defines a suite of services providing equivalentfunctionality for the Geographic Information System (GIS) problem domain as might be requiredin an IOOS data system.The target for the BSM are GIS users and applications. Input data is abstracted into Layers andFeatures consistent with the expectations of GIS users and applications. All data must be geo-referenced,with the implicit assumption that the various BSM servers are capable of performing spatialreference system (SRS) transformations from the data’s native SRS to the client’s requested SRS.In response to a client’s request, each BSM server returns its output response formatted in a wellknownbinary (WKB) representation, though the set of WKBs differs between BSM server types.For the sake of brevity, this review will focus on the basic interoperability approaches taken by theOGC BSM and OPeNDAP/NVODS. Documentation for the various OGC specifications describedin this review are available at the OpenGIS website, http://www.opengis.org/.OPENGIS ORGANIZATIONAL STRUCTUREThe OpenGIS Consortium operates to develop interoperable technologies involving geospatial information.The organization comprises two primary programs, the Specification Program and theInteroperability Program. The Specification Program operates through Technical (TC) and Planning(PC) committees to identify the standards required to foster interoperability between variousgroups (SIGs) within the geospatial information community. The Interoperability Program (IP)identifies and manages testbed and pilot projects that implement the proposed standards originatingin the Specification Program, feeding the results of those activities back into revisions ofthe underlying standards. Combined, these two programs function to develop publicly accessibleimplementation specifications for the development of standards-based commercial off the shelfsoftware (SCOTS) for the geospatial information community.192