download as a pdf - Southern California Coastal Ocean Observing ...

Part I. OverviewSection 2. Technical AnalysisIOOS DATA COMMUNICATIONSThe relationship among the DMAC Subsystem and other IOOS components and partners is depictedin Figure 1. Data flow within IOOS begins with the Observing Subsystem. Raw measurementsfrom the Observing Subsystem elements are processed at various Primary Data Assemblyand Quality Control sites to make them available to the uniform DMAC Data CommunicationsInfrastructure through a DMAC Data Entry Point. Every IOOS data stream must have a DMACData Entry Point. The infrastructure consists of standards and protocols to support: (i) IOOSwidedescriptions of data sets (Metadata); (ii) the ability to search for and find data sets of interest(Data Discovery); (iii) the ability to access the data in an interoperable manner from client applications(Data Transport); (iv) the ability to evaluate the character of the data through common WebBrowsers (On-line Browse); and (v) the ability to securely archive data and metadata and retrievethem on demand (Data Archive).The DMAC Data Communications Infrastructure provides access to IOOS data for all IOOS componentsand partners. Bi-directional communications will exist between independent data managementsystems both internal and external to the IOOS framework—data management systemsfrom regional and international entities and from distinct disciplines such as meteorology. TheDMAC Data Communications Infrastructure also conveys data, metadata and data products tousers’ applications (programs) and to those entities both inside and outside of IOOS who generatevalue-added information products. The information products and data address the interests of U.S.society through the advancement of the seven IOOS goals (Preface). Ultimately, it is the needs ofU.S. users that guide the selection of new measurements, infrastructure, procedures, and productsthrough IOOS User Outreach mechanisms.The DMAC Plan (this document) offers a detailed, phased implementation strategy specifically forthe development of the DMAC Subsystem Data Communications Infrastructure and Archive.THE OBSERVING SUBSYSTEM AND PRIMARY DATAASSEMBLY/QUALITY CONTROLIOOS Observing Subsystem elements are managed by regional, national, and international entities.The measurements are highly heterogeneous, originating from surveys (e.g., fish stock assessments),cruise measurements, laboratory measurements, satellites, and automated inputs from insitu and remotely sensed sources that include time series, profiles, swaths, grids, and other datastructures. A wide range of telemetry systems, including the World Meteorological Organization’sGlobal Telecommunication System (GTS), are used to transfer data from the measurement platformsto and among the locations at which Primary Data Assembly and Quality Control occur.21