Developments on the EPOS-IP strain rate product

The main topic is always seismology at the General Assembly of the European Seismological Commission (GA ESC). This year, the 36th Assembly was held in Valletta, Malta, from September 2nd to the 7th , 2018. The event was organized by the Department of Geosciences of the University of Malta, and it brought a new approach: a presentation about the work done by EPOS TCS GNSS Data and Products.

Athanassios Ganas (NOA), an EPOS TCS GNSS member, introduced this TCS by presenting for the very first time the preliminary product which is the strain rate map of western Eurasia. “In this contribution, were presented preliminary results from 452 permanent European GNSS stations, operating until 2017 and processed at UGA-CNRS (Université Grenoble Alpes, Centre National de la Recherche Scientifique)”, says Ganas.

Strain rate field – According to him, to calculate the strain rate field, they used two open-source algorithms recommended by EPOS-IP, namely the VISR (Velocity Interpolation for Strain Rate) algorithm (introduced by Shen et al., 2015) and STIB (Strain Tensor from Inversion of Baselines), developed by Masson et al., (2014) as well as the SSPX software suite (Cardozo and Allmendinger, 2009).

PDF iconDevelopments on the EPOS-IP Pan-European strain rate product

GLASS, a tool for quality-controlled GNSS Data and Products dissemination

Paul Crocker, professor from University of Beira Interior (UBI) and an EPOS TCS GNSS Data and Products member, presented a poster about GLASS at AGU Fall Meeting. The event, hosted from December 10th to 14th, at Walter E Washington Convention Center, had the poster presentation addressed at Hall A-C (Poster Hall) on Wednesday (December 12th, 2018), from 13:40 to 18:00 (Washington, D.C. time).

According to the abstract submitted, “Europe is covered by various networks of GNSS stations maintained by different agencies with different technical and scientific objectives. The EPOS-IP (European Plate Observing System – Implementation Phase) project aims to harmonize and standardize data collection and processing and to design and establish dedicated products and services that benefit the existence of national and pan-European infra-structures (in particular EUREF), optimized for Solid Earth Research applications”.

Paul Crocker (UBI) presenting the poster about GLASS at AGU Fall Meeting.Distributed software architecture – Therefore, the idea has been to present the efforts carried out by the members of EPOS TCS GNSS Data and Products to create a distributed software architecture called GLASS, a tool for quality-controlled dissemination within the EPOS. During the operational phase, to start in 2019, this shall provide GNSS data and derived products (coordinates, velocities and strain rates) from thousands of stations in Europe region.

Data flows – “We took the opportunity to describe the data flows from data suppliers and analysis centers to the various EPOS data portals and the integration into the overall EPOS system. In particular we have described the quality control steps that are performed in the GNSS Data and Products, from validating the station log files, obtaining quality metrics of RINEX files and their role in monitoring the overall system strength”, explains Paul Crocker.

Several analysis centers – According to Crocker, was also described how time series and other GNSS products computed at several analysis centers are compared and how the detection of outliers and verification of jumps are dealt with. In terms of Data and Product Dissemination had been detailed the overall software and portal components, the technologies that are used and resulting API’s and their descriptions in formal languages for integration into the central EPOS systems software and existing workflow.

Authors – The authors of this poster, entitled “GLASS, a tool for quality-controlled GNSS Data and Products dissemination”, are: Paul Crocker (UBI), Jan Dousa (Research Institute of Geodesy), Mathilde Vergnolle (CNRS), Carine Bruyninx (Royal Observatory of Belgium), Machiel Simon Bos (UBI), Rui Manuel Silva Fernandes (UBI), Benedikt Ofeigsson (Icelandic Met Office), Petr Bezdeka (Research Institute of Geodesy), Rui Cardoso (UBI), Rafael Couto (UBI), Andras Fabian (Observatoire Royal de Belgique), Juliette Legrand (Royal Observatory of Belgium), Khai-Minh Ngo (Géoazur – Université Nice Sophia Antipolis), Tim Sonnemann (University of Iceland) and Pavel Vaclavovic (GOP/RIGTC).

EPOS-IP is a project funded by the ESFRI European Union.

PDF icon GLASS: a tool for quality-controlled GNSS Data and Products dissemination.pdf

New way of GNSS data dissemination within the European Plate Observing System (EPOS)

The poster “New way of GNSS data dissemination within the European Plate Observing System (EPOS)” was presented by Jan Douša, member of TCS GNSS Data and Products, at IGS Workshop 2018, which has been held in China for the first time.

Hosted and organized by Wuhan University receiving assistance from the State Key Laboratory of Satellite Navigation System and Equipment Technology and sponsorship from relevant partners, the event entitled “Multi-GNSS through global collaboration” occurred from October 29th to November 2nd.

Jan Douša took the opportunity to explain – at the poster presentation – what is EPOS for, besides approaching GNSS data dissemination, which includes talking about GLASS software package. “The European Plate Observing System (EPOS) has been established to facilitate, harmonize and standardize data collection and processing for Solid Earth Research applications”, said Douša.

PDF iconNew way of GNSS data dissemination within the European Plate Observing System (EPOS)

GNSS Metadata Management and Distribution System (M3G)

On May 30th until June 1st, 2018, EPOS TCS GNSS Data and Products participated to the EUREF 2018 Symposium, which was hosted in Amsterdam, Netherlands. GNSS Metadata Management and Distribution System (M3G) was a poster by A. Fabian, C. Bruyninx, J. Legrand presenting the new metadata management and distribution system for multiple GNSS networks that is used in EPOS and to which the EPN is presently migrating.

https://intranet.epos-ip.org/modules/file/icons/application-pdf.pngGNSS Metadata Management and Distribution System (M3G)

EPN Multi-year Position/Velocity Solution

On May 30th until June 1st, 2018, EPOS TCS GNSS Data and Products participated to the EUREF 2018 Symposium, which was hosted in Amsterdam, Netherlands. Juliette Legrand presented the new EPN multi-year position and velocity solution expressed in the IGS14, which will also be provided as a EUREF product to EPOS. She explained how the product was generated and how its quality is verified.

https://intranet.epos-ip.org/modules/file/icons/application-pdf.pngEPN Multi-year Position/Velocity Solution

ROB’s GNSS Contribution to EPOS

On May 30th until June 1st, 2018, EPOS TCS GNSS Data and Products participated to the EUREF 2018 Symposium, which was hosted in Amsterdam, Netherlands. The goal of ROB’s GNSS Contribution to EPOS (by C. Bruyninx, A. Fabian, J. Legrand, E. Pottiaux, F. Roosbeek) presentation was to give an overview of how the Royal Observatory of Belgium (ROB) is presently involved in EPOS IP, how its plans to contribute to the operational phase of EPOS, and how these activities are linked with ROBs present EUREF activities. “We aim to demonstrate how ROB is heavily involved in the development of EPOS and plans to play an active role in EPOS once the infrastructure will be operational”, said Carine Bruyninx.

https://intranet.epos-ip.org/modules/file/icons/application-pdf.pngROB’s GNSS Contribution to EPOS

Multi-GNSS Capability of the EUREF Permanent Tracking Network

On May 30th until June 1st, 2018, EPOS TCS GNSS Data and Products participated to the EUREF 2018 Symposium, which was hosted in Amsterdam, Netherlands. The oral presentation Multi-GNSS Capability of the EUREF Permanent Tracking Network (by C. Bruyninx, J. Legrand, A. Fabian, F. Roosbeek) showed that there are 324 stations in the EUREF Permanent Network (EPN), highlighting that 39 stations were added last year and that, since last symposium, five new stations were included. This report also presented the stations presently proposed to the EPN and why they are not included in the EPN yet. About the multi-GNSS tracking network, based on RINEX data, 7% track GPS-only, 40% track GPS+GLO and 53% track (at least) GPS+GLO+GAL.

https://intranet.epos-ip.org/modules/file/icons/application-pdf.pngMulti-GNSS Capability of the EUREF Permanent Tracking Network

EPOS TCS GNSS Thematic Core Service @ European Plate Observing System

On May 30th until June 1st, 2018, EPOS TCS GNSS Data and Products participated to the EUREF 2018 Symposium, which was hosted in Amsterdam, Netherlands. Therefore, to disseminate this Thematic Core Service, Rui Fernandes, coordinator for EPOS TCS GNSS Data and Products, had been chosen as a representative to speak about EPOS at EUREF Symposium. To leverage EPOS awareness, he started by reminding the audience that “EPOS is a long-term project for the integration of research infrastructures for Solid Science in Europe. Therefore, one of the three priority projects of European Commission within ESFRI”.

https://intranet.epos-ip.org/modules/file/icons/application-pdf.pngEPOS TCS GNSS Thematic Core Service @ European Plate Observing System

Management and dissemination of GNSS site log metadata using the new GeodesyML

On October 25th and 26th, 2017, EPOS GNSS Data and Products was one of the themes at Minutes of the EUREF AC Workshop, in Brussels. At the workshop open session, by the presentation entitled Management and dissemination of GNSS site log metadata using the new GeodesyML standard, Andras Fabian from EPOS GNSS Data and Products (and from Royal Observatory of Belgium) gave an update on the new GNSS metadata system developed for EPOS.

https://intranet.epos-ip.org/modules/file/icons/application-pdf.pngManagement and dissemination of GNSS site log metadata using the new GeodesyML

According to Fabian, “this new system will be used within EUREF and EPOS to manage GNSS
station metadata”.

Quality assessment of the EUREF Permanent Network multi-year position and velocity solution

The COSPAR 2018 Assembly took place at Pasadena, United States, last July from 14th to 22nd. In this event, which goal is to promote international cooperation in the pursuit of scientific research in space, Juliette Legrand, EPOS TCS GNSS Data and Products member, attended by speaking about EPOS developments and contributions to Solid Earth Science researches.

https://intranet.epos-ip.org/modules/file/icons/application-pdf.pngQuality assessment of the EUREF Permanent Network multi-year position and velocity solution