Geodetic Seamless Archive Centers Modernization – Information Technology for Exploiting the Data Explosion Abstract


  • Space geodetic science and other disciplines using geodetic products have benefited immensely from open sharing of data and metadata from global and regional archives Ten years ago Scripps Orbit and Permanent Array Center (SOPAC), the NASA Crustal Dynamics Data Information System (CDDIS), UNAVCO and other archives collaborated to create the GPS Seamless Archive Centers (GSAC) in an effort to further enable research with the expanding collections of GPS data then becoming available. The GSAC partners share metadata to facilitate data discovery and mining across participating archives and distribution of data to users. This effort was pioneering, but was built on technology that has now been rendered obsolete. As the number of geodetic observing technologies has expanded, the variety of data and data products has grown dramatically, exposing limitations in data product sharing. Through a NASA ROSES project, the three archives (CDDIS, SOPAC and UNAVCO) have been funded to expand the original GSAC capability for multiple geodetic observation types and to simultaneously modernize the underlying technology by implementing web services. The University of Nevada, Reno (UNR) will test the web services implementation by incorporating them into their daily GNSS data processing scheme. The effort will include new methods for quality control of current and legacy data that will be a product of the analysis/testing phase performed by UNR. The quality analysis by UNR will include a report of the stability of the stations coordinates over time that will enable data users to select sites suitable for their application, for example identifying stations with large seasonal effects. This effort will contribute to enhanced ability for very large networks to obtain complete data sets for processing.

publication date

  • 2012

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