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Part II. Phased Implementation Plan for DMAC7.5.2. Parameter subsetting – Extracting one or more variables from data sets containing manyvariables.7.5.3. Temporal subsetting – Extracting short periods from data sets covering longer periods.7.5.4. Temporal aggregation – Creating a longer time series from data files for shorter periods.7.5.5. GIS products – Depicting data projected, interpolated, and rendered onto a map withGIS protocols.7.5.6. On-line analysis – Analyzing online by using tools on the data server such as the GridAnalysis and Display System (GrADS) or the Live Access Server (LAS). The resultingdata or graphics can then be downloaded.7.6. Data sets that are stored offline shall be kept accessible and discoverable through the data-discoveryinterfaces.7.6.1. This access to offline data may be initiated by online ordering. Online ordering is amechanism by which data are ordered and then picked up or delivered later.7.7. The AA shall accommodate maximum latency periods as defined in the metadata.7.7.1. For IOOS access latency is defined as the time between the earliest primary observation(not counting ancillary data) in a data file and the availability of that file to users.7.7.2. Latency requirements shall be assessed and suitably defined in the metadata.7.8. The AA shall provide unrestricted access under normal circumstances7.8.1. The AA shall restrict access under special circumstances including:7.8.1.1. Proprietary embargo – Data are available only for sale from commercial companies.7.8.1.2. National security – Data are available only for defense purposes.7.8.1.3. Calibration and validation – Data are available only to the science team whilethey calibrate or validate instruments, data, or models.7.8.1.4. Non-commercial use only – Data are available for government applications andacademic research, but not for resale.7.9. The AA shall provide user services and use metrics.7.9.1. Online documentation and knowledgeable staff shall be available to provide assistanceand advice on both access and content.7.9.2. Additional background information will be available through references and citations inthe metadata.7.9.3. The AA shall provide a facility to collect broad use metrics to evaluate the system effectivenessand gain a sense of how to improve it. Metrics shall include the following as aminimum:75