Toward the generation of EPOS-GNSS products: Massive GNSS processing and evaluation of a statistical approach for the velocity field computation

Abstract : In the framework of EPOS (European Plate Observing System) project implementation phase, an analysis center is hosted in France at Université Grenoble Alpes – CNRS. Within the work package WP10, GNSS data and product, UGA-CNRS is responsible for providing products (position time series and velocity field) generated by a processing using double difference method (via GAMIT/GLOBK software). For this purpose, we developed strategies to take up the up-scaling challenge and generate from a big data set the usual GNSS products. For computational efficiency, the massive data set was split into sub-networks and the GAMIT software launched for each sub-network independently, following the same approach than the one presented in the framework of the PBO project. The informatics resources at our disposal are composed of a management tool for batch processing on computing environments (CiGri) and an open source data management software (IRODS), installed on the high performance computer available at UGA (CIMENT). Concerning the velocity field computation, we used MIDAS software. A few different tests were performed in order to check the reliability of our solution and to determine the best way to proceed. We also take advantage of the human and computational resources available in order to include in our solution some no-EPOS stations and generate: - An exhaustive solution in France, including stations from RENAG, RGP and ORPHEON. Such dense solution was never performed before using DD method. - A solution in Greece including data from the SMARTNET network. Our solution includes more than 1500 stations constituting a widespread pan-European network, over an 18-years time span [2000-2017].
Keywords : RESIF EPOS GNSS Big data
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Poster communications
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Contributor : Véronique Bertrand <>
Submitted on : Wednesday, January 9, 2019 - 11:53:49 AM
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Aline Déprez, Anne Socquet, Nathalie Cotte, Andrea Walpersdorf. Toward the generation of EPOS-GNSS products: Massive GNSS processing and evaluation of a statistical approach for the velocity field computation. 19th General Assembly of WEGENER : on Earth deformation & the study of earthquakes using geodesy and geodynamics, Sep 2018, Grenoble, France. 2018, ⟨https://wegener2018.sciencesconf.org/⟩. ⟨hal-01958416⟩

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