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Part III. Appendix 3: Data Archive and AccessData Provision and AccessData can be accessed from any suitable component of the IOOS Archive System (Figure 1). By queryingthe system with its data-discovery interface, users or applications can discover what data areavailable. The data may then be pulled automatically with the OPeNDAP protocol and data transportmethods, or by the user from a GUI that displays the various options.Using the OPeNDAP protocol for transporting data will allow the Archive System to provide a hostof services beyond current-day simple file downloads. They include real-time subsetting, on-lineanalysis, reformatting, and support for GIS applications.Although the designation of IOOS data sets is yet to be determined, the March 2002 Ocean.USworkshop defined the most important variables in various disciplines. Relevant, extant data setswill be identified and potential new data sets and products determined and prioritized during theearly phases of implementation.Not all access requirements fit all data sets. As the IOOS grows, its services will evolve. To accommodatethis evolution and to provide service to the expected broad IOOS user community, accessservices will be tailored to data sets. This can be illustrated conceptually as a matrix of data sets andservices (Table 2).Table 2. Conceptual matrix of data access services for different data sets at different componentsof the IOOS Archive system. Note that data set 3 is offered at two centers, but with different services.Center Data set Core Services Extended IOOS ServicesFTPHTTPOPeNDAPSpatial SubsetParameter SubsetTemporal SubsetTemporal AggregationOpenGIS MapOnline AnalysisOnline OrderingCenter 1Center 2Data set 1 X X XData set 2 X X X X X X LAS XData set 3 X X XData set 3 X X X GrADSData set 4 X X X208