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- J. R. Thieman, NASA/GSFC
- S. Hughes and D. Crichton, JPL
- 18th International CODATA Conference
- October 2, 2002
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- Build a system that meets the global Space Physics User Requirements.
- Facilitate the circulation of related scientific and technical
information.
- Facilitate the (two-way) interface with international technical standards
and development organizations.
- Avoid duplication of effort between geographically distant archiving
centers.
- Ensure the compatibility of the architectures used for the global
distributed system and as many of the individual data centers as
possible.
- Reduce costs by development of a system that
- uses widely approved technical standards,
- is easy to maintain (both globally, and in each archiving center),
- can easily evolve so as to profit from future technological
developments,
- can be interfaced with the systems of adjacent disciplines and,
hopefully one day, with a global system.
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- Cross Archive Search Capability
- Common Data
Dictionary/Terminology
- Easy Method of Data
Intercomparison
- Rapid Retrieval of Data of
Interest
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- Hundreds of links are applicable
- Difficult for any one group to maintain
- Data information differs at each site
- Data access methods must be learned for each data provider
- No easy method of comparing data from differing sites
- No common method of acquiring data
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- Search and retrieval must work with data centers current search systems
and data formats
- Effort necessary for data centers or even individual data holders to be
included in SPASE must be minimal
- The data must be freely available to the community (some data may be
proprietary for an initial period)
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- To enable cross system searching in Space Physics we must adopt:
- > a common search and retrieval protocol
- > a common terminology
- The terminology must be mapped to the terms used by each individual
system.
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- Step 1a - Simple cross-system searches enabled by spacecraft, experiment
and time with link to data center for requesting data
- Step 1b - Develop a common data dictionary/terminology
- Step 2 - Search by location, parameter measured, instrument type, etc.
with link to data center for requesting data
- Step 3 - Information from searches on whole data sets or subsets of the
data can be sorted according to criteria of interest and directly
ordered
- Step 4 - Search can be set to order only data sets or parts of data sets
that follow a given search rule
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- Challenge: To integrate a collection of resources and provide seamless
access to distributed data repositories
- Solution: A system that is fully functional, operationally reliable and
extensible, and is capable of:
- Adapting to mission(s) having more complex payloads and significantly larger
data volumes.
- Adapting to not yet compliant PDS data sets.
- Providing unified web based search-and-retrieval user interface to
novice and sophisticated users.
- Using Internet as the primary method of data distribution.
- Supporting real time (on demand) distribution of data to users.
- Provide ability for users to subscribe for notification of released
data.
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- Implemented a multi-tiered information architecture
- Application Clients (Browsers/Interfaces)
- Middleware - Object Oriented Data Technology (OODT)
- Data and Metadata Servers (product server, profile server)
- Data Repositories and Catalogs
- Simplified and standardized system interfaces through middleware
- Used existing PDS subsystems but hide heterogeneity
- User Interfaces (Atlas, DITDOS)
- Data repositories (disk farms)
- Catalog databases (Sybase, Gatesware,…)
- Remained geographically distributed and locally managed
- Separated Data Architecture from Technology Architecture
- Used archive metadata to its full potential
- Evolved technology architecture
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- The Space Physics Archive Search & Exchange (SPASE) is being
developed by CDPP, NSSDC, PDS, RAL, and SwRI
- Common architecture and terminology approaches are being prototyped
- Data set search and information about available data sets will be
provided first
- Intercomparison of data sets and elements of data sets is a later phase
- Direct retrieval of comparable data of interest from multiple sites is
the final phase
- Other space physics data holders are welcome to join the effort
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- Permits search for astronomy data by:
- Object location (RA/Dec)
- Object name (lookup translation to location)
- Object search is done at all or selected data centers
- Results are displayed in a common interface and often include the actual
images or other data of interest
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Notes
