Papers in PDF format

• The metadata stored in the database needs to be maintained by the SADS administrator, but, for each
mission stored in the SADS, a set of information pages has to be provided by the mission's Principal
Investigator. These pages are provided in standard HTML format, but, to ensure uniformity of presentation
among the various missions, a template structure for those pages has been designed. These templates ensure
homogeneous presentation and navigation structure between missions, while preserving the freedom for the PI
to design the pages' contents at will.
Conclusion and Future Work
The SADS prototype is currently undergoing intensive tests within the scientific community, mainly in the field
of Plasma Physics. At the present time, the system offers access to 32 different sets of data acquired during 5
space missions (INTERBALL, Sweden VIKING, ISEE1, VOYAGER, GEOS). Approximately 1 giga-bytes of
space data are accessed by the prototype by month.
A critical analysis of the limitations of this approach is being carried out. The analysis focuses in particular on
system adaptability to all types of data, (whereas the data currently stored in the SADS is mainly structured and
queried according to time periods). This analysis forms the basis for an object-oriented model of a more general
prototype known as AGDS (Accès Généralisé aux Données Spatiales, Generalized Access to Space Data).
Through the use of inheritance in the metadata model, we expect to make easier the insertion in the system of
data of more various nature.
In the same time the CDPP project (Plasma Physics Data Center), is under way, to offer an operational access
system to Plasma Physics Data.
References
[CCSDS 1990] CCSDS (1990). Time code Format, CCSDS 301.0-B-2, blue book, issue 2, April 1990.
[CCSDS 1995] CCSDS (1995). The data description language EAST specification, CCSDS 644.0-R-1, Red
book, November 1995.
[CCSDS 1996] CCSDS (1996). Reference Model for Archival Information Services, June 1996, Version 4.0
(Available from http://www.gsfc.nasa.gov/nost/isoas/overview.html)
[Huc 1995] C. Huc (1995). A strategy for the long term preservation of space mission data, JTS95 Symposium,
London, January 27-29, 1995
[Huc et al. 1996] C. Huc, T. Levoir, M. Nonon-Latapie (1996). Long-term archiving and data access:
modelling and standardization (published at the Fifth Nasa/Goddard Space Flight Center Conference On Mass
Storage Systems And Technologies, September 17-19, 1996)
[Larzul et al. 1996] B. Larzul, D. Minguillon, P. Mazal (1996). EAST Technology for an automated processing
of Space Data (to be published at the SPACE OPs symposium, Munich, November 1996)