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Data - GSAC Meeting at Scripps Institute
GSAC Meeting at Scripps Institution of Oceanography 1-2 February 1999 center>-prepared by Hadley Johnson (Seamless Archives Community Coordinator) Participants: Gordan Adams, NGS
On February 1-2 the GSAC working group met in San Diego to discuss and finalize information exchange mechanisms. Starting from the previous version of the Archive Structure and Data Exchange Formats document we made several simplifying changes and generally improved the overall structure of the GSAC. The new version of this document is available here and will be considered as the final specification for version 1.0. It was decided that in the initial stages the GSAC would allow only 6 types of data: three types of RINEX (obs, nav, and met), IGS-style site logs, precise orbit files (sp3 format), and SINEX. In future this list will be expanded, but it was felt that these six covered a wide enough range that users would find it useful and archive operators would not be overwhelmed. The exchange information for these six file types was extensively discussed and a single Data Holdings File format was agreed on. This ASCII-format file contains all of the needed information about the data holdings of an archive so that all other participants in the GSAC can know who has what data and how to direct users to it. In addition we finalized the format of the Monument Catalog which is a file containing information about the sites at which an archive has data, such as site name, coordinates, etc. Details on these two data formats is available in the above document. The UNAVCO-Boulder and SOPAC groups discussed their plans to write general-purpose computer programs to implement the GSAC. These should make it reasonably easy for any GPS data archive to generate the required information exchange files and to maintain the GSAC ftp area as explained in the above document. These will be available to all GSAC participants when completed. The next informal meeting of the GSAC working group will be at the April UNAVCO Community meeting in Boulder. We hope to have at least one or two of the GSAC participants up and running by that time so that the system can be demonstrated. Additional archives will then, hopefully, be able to join during the following months, with a goal of significant participation by the summer of 1999.
Comments or questions about this page? Send e-mail to Lou Estey (lou Last modified Wednesday, 16-Nov-2005 21:21:00 MST |
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