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Part II. Phased Implementation Plan for DMAC7. Data Provision and Access7.1. The AA shall accommodate data access from any suitable component of the IOOS Archive System(Figure 3, Data Archiving and Access Requirements).7.1.1. By querying the system with the DMAC data-discovery interface, users or applicationscan discover what data are available. The data may then be pulled automatically with thedata transport methods, or by the user from a GUI that displays the various options.7.2. The AA shall implement the protocol for transporting data defined in Section 1, Data TransportRequirements.7.3. The AA shall provide for access services tailored to data sets as provided in Table 2.7.4. The core protocols shall include FTP, HTTP, and the IOOS DT protocols. Most IOOS data setswill be available in at least one, and preferably two or three, of these protocols. As the IOOSstandard transport protocol, OPeNDAP should be used whenever possible. The characteristicsfor each of these core services are:7.4.1. FTP – Direct downloads of data files, unrestricted public access, and no application support.7.4.2. HTTP – Direct downloads of data files, restricted or unrestricted access, and no applicationsupport.7.4.3. OPeNDAP – Application-layer protocol that supports a number of data storage formatsand allows a number of client applications to access data transparently.7.5. The AA shall use the IOOS DT protocols to offer the following extended services:7.5.1. Spatial subsetting – Extracting spatial sub regions from data sets for larger geographicareas.Table 2.CenterData setCoreServicesExtended IOOS ServicesFTPHTTPOPeNDAPSpatialSubsetParameterSubsetTemporalSubsetTemporalAggregationOpenGISMapOnlineAnalysisOnlineOrderingCenter 1 Data set 1 X X XData set 2 X X X X X X LAS XData set 3 X X XCenter 2 Data set 3 X X X GrADSData set 4 X X XConceptual matrix of data access services for different data sets at different component of the IOOS Archivesystem. Note that data set 3 is offered at two centers, but with different services.74