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Part III. Appendix 2: Data TransportThis is envisioned as a one person year effort based on the assumption that a technology alreadyexists and simply needs to be selected and integrated with the pull side. IOOS should budget on theorder of $150k for this pilot.166
Part III. Appendix 2: Data TransportAnnex A: The Intersection of DataTransport and MetadataMetadata is information about data. Generally, when metadata are discussed, one is referring toinformation about the contents of the data, for example, the variable T refers to sea surface temperatureand its units are degrees Centigrade or the data set covers the period 8 January 1982 through29 May 1990. We prefer to take a broader view of metadata, dividing it into two basic groups: syntacticand semantic metadata.Syntactic metadata is information about the data types and structures at the computer level, thesyntax of the data, for example, variable T represents a floating point array measuring 20 by 40 elements.This is information that is required as part of the transport protocol for the data in a networkbased data system.Semantic metadata is what one normally thinks of as metadata, information about the contentsand context of the data set.THE THREE-TIERED DATA SYSTEMEarth science data systems are generally viewed as consisting of three primary levels:• The Directory Level provides a list of data sets along with the parameters available and theapproximate temporal and spatial coverage for each data set. An example of an entry in such asystem: a hydrographic data set at the National Oceanographic Data Center (NODC).• The Inventory Level provides a detailed listing of the data granules within a data set. Forthe NODC hydrographic data set, this might consist of a listing of each cast along with the location(latitude and longitude) and time of the cast.• The Data Level consists of the actual data objects.Directories have generally been maintained separately from inventories and from the actual data.Inventories, when they exist, are often found collocated with the data. Inventory access functionsand data access functions, however, have been kept separate.In the past, practical considerations related to limited networking and storage capacities encouragedthis hierarchical view. These constraints are relaxing rapidly now, however, and so other structuresare becoming practical. For example, in a totally distributed system, in which directory, inventory,and possibly data-acquisition functions are combined, directory and inventory informationcould be combined and maintained at the same site(s) as the data. There would be no distinction167
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Data Management and Communications
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Data Management and Communications
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Table of Contents
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GlossaryLAS ..................Live
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Executive Summary2
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Executive SummaryTECHNICAL ANALYSIS
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Executive SummaryDMAC Metadata will
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Executive SummaryCOSTSThe cost esti
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Part I. OverviewContentsPreface ...
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Part I. OverviewIOOS - Enhancements
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Part I. Overviewing processes descr
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Part I. OverviewTHE VISIONIOOS is e
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Part I. Overview3. Heterogeneous da
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Part I. OverviewOne of these coordi
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Part I. OverviewIOOS Data Communica
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Part I. OverviewTHE DMAC SUBSYSTEM
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Part I. OverviewData Transport(see
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Part I. OverviewTable 1. Near-term
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Part I. Overviewdata and taxonomies
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Part I. OverviewFigure 2. The Archi
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Part I. Overview• All data collec
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Part I. OverviewSection 3. Manageme
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Part I. Overviewthough documented a
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Part I. Overviewthis “spiral” u
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Part I. OverviewTable 3. DMAC Overa
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Part I. Overview• Program Initial
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Part I. OverviewOutcome 3: Agreemen
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Part I. OverviewCONCRETE GUIDANCE T
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Part I. Overview- Notify the Nation
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Part II. Phased Implementation Plan
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Part III. Appendix 1: Metadata and
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Part III. Appendix 3: Data Archive
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Part III. Appendix 4: User Outreach
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Part III. Appendix 5: System Engine
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Part III. Appendix 6: Technology Ma
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Part III. Appendix 6: Technology Ma
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Part III. Appendix 7: Biological Da
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Executive Summary - Draft2300 Clare
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