From Ocean Teacher Library
Marine Data Transmission and Product Distribution SystemsContents |
Background
[this is an entirely new section, with several subsections. Although there were early versions of it in old OT, it will cover major systems on an article-by-article basis, so there is nothing to convert that would cover them adequately now. Also at least one large illustrated table is involved. This will require a lot of new work, and possibly some guest authors, especially in the WMO and JCOMM items.]
Early Practices
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General Communications
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Distributed Systems vs. Centralized Systems
The choice of whether to implement a distributed or centralized model will be based on a variety of considerations. The distributed data model has several potential advantages. The first advantage is that data can be managed within the centre where the expertise exists. The second advantage is that the work required maintaining a distributed system can be shared amongst the partner organizations. There may also be savings in operating costs by not having to duplicate specific expertise. The choice of a conceptual model should take into consideration the available technology and human resources to ensure the efficiency and sustainability of the system. The extensibility of the adopted model should also be considered.
Centralized Model
Many data providers, such as researchers, projects, research cruises, observation platforms, may not have their own data management capabilities. In this case all data is sent to a central data centre, for example an IODE National Oceanographic Data Centre, where it is centrally managed and distributed.
Distributed Model
In a distributed model, data holdings remain with the originating data centre. T and are dynamically accessed through the internet rather than through a central repository. This model provides improved inter-agency cooperation and coordination with uniform data and metadata standards and protocols. The distributed model takes into consideration the considerable volume of data that can be generated by operational oceanography programmes. These high volumes can no longer be managed by a single data centre. Using a web services approach, such as a data portal, to build a distributed network of data providers can improve the ability to share and integrate oceanographic data and reinforce the concept of distributed data custodianship where each agency is responsible for providing access to datasets.
While the distributed model provides several advantages, it could present some constraints as it requires:
- High level of technology and coordination to setup the network and ensure its efficient functioning.
- Adoption of accepted standards and protocols to ensure interoperability across the different components of the distributed system.
Additional Resources
Subsections of this Article
| Pagename | Short title | Description | |
|---|---|---|---|
| Exchanging In-situ Ocean Data | Exchanging In-situ Ocean Data | Exchanging In-situ Ocean Data | A how-to guide for data submission for international exchange |
| Global Earth Observing System of Systems (GEOSS) | Global Earth Observing System of Systems (GEOSS) | GEOSS | The Global Earth Observation System of Systems will provide decision-support tools to a wide variety of users through a global network of content providers. GEOSS will link together existing and planned observing systems and support the development of new systems where gaps currently exist. |
| IODE Ocean Data Portal (ODP) | IODE Ocean Data Portal (ODP) | IODE Ocean Data Portal | The Ocean Data Portal facilitates the exchange and dissemination marine data and services from the NODCs in the IODE network |
| Marine Biodiversity Data Networks | Marine Biodiversity Data Networks | Biodiversity Data Networks | none |
| Open Geospatial Consortium (OGC) Web Services | Open Geospatial Consortium (OGC) Web Services | OGC Web Services | OGC is the standards organization that develops standards for geospatial content and services |
| Open-Source Project for a Network Data Access Protocol (OPeNDAP) | Open-Source Project for a Network Data Access Protocol (OPeNDAP) | OPeNDAP | none |
| SeaDataNet: Pan-European Infrastructure for Ocean and Marine Data Management | SeaDataNet: Pan-European Infrastructure for Ocean and Marine Data Management | SeaDataNet | none |
| World Meteorological Organization (WMO) Systems | World Meteorological Organization (WMO) Systems | WMO Systems | Overview of WMO's World Weather Watch (WWW) and Global Observing System (GOS) as introduction to the JCOMM and MMOP activities and services. |
Information about this article
Short title: Transmission and Distribution
Description: Technology developed for global electronic publication of data, analysis products and model simulations of the marine domain
Expertise level: beginner
Author: Murray.Brown
Approval status: approved
Approved by: Murray.Brown
Last change: 2012-1-30
Subsection of: Marine Data Management
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