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).
The GNSS Data & Products TCS provides three portals.
The first, M3G, is the central access point for operational centers to upload the log-files of their GNSS stations. The metadata inside these log files will be validated before it will be accepted as a new, or updated, EPOS GNSS station.
The second one is the GNSS Data Gateway where people can search for available GNSS data from all over Europe, including EUREF Permanent GNSS Network (EPN) data.
Finally, at the GNSS Product portal one can download derived GNSS products such as position time series, velocities and strain rate maps. The information at last two portals can also be accessed using RESTful API’s or through the central ICS (Integrated Core Services) website.
The link of the portals are:
EUREF Permanent GNSS Network (EPN) data and products are integrated as data nodes. EPN is maintained by EUREF, one European level organization, and relies on 260+ GNSS stations, based on a partnership with site operators from about 30 countries.
The EPN is running in a well-organized environment and distributing GNSS data and products. EUREF is also providing products for 2000+ EPN densification stations. In addition, there are also several GNSS networks dedicated to solid earth studies at national level.
Virtual access to data/products/services
Relying on EUREF GNSS (Global Navigation Satellite System), geodetic observations (stored at RINEX) and derived products (site coordinate time-series and velocities, strain rate maps) and metadata (Level 0, 1, 2) will be accessible.
Virtual access to computational platforms
Using a software tools to facilitate the cross-disciplinary use of geodetic data and the interoperability with adjacent disciplines.
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Access to validated data from EPOS stations through EPOS GNSS Data gateway:
► RINEX data
► Station metadata
Monitoring of the GNSS data quality.
Centralised facility to submit/validate EPOS station site logs.
Access to validated EPOS products through EPOS GNSS Product gateway:
► Positions and time series
► Strain rate fields
Generation of dedicated products:
► GNSS data analysis generating daily solutions, position time series and velocities (using Precise Point Positioning approach and Double Difference approach).
► Dense European Velocity including EPOS stations as well as EUREF densifation network.
► Strain rate fields.
► Distribution and maintenance of software package GLASS to provide access to GNSS data.
► GLASS (Geodetic Linking Advanced Software System) is an integrated software package deployed in a GNSS infrastructure to manage data and metadata
► Developed from the original Geodetic Seamless Archive Centres (GSAC) concept, GLASS is an open source platform under Creative Commons licensing.
For guaranteeing data availability, GLASS counts on a default repository (primary) decided by the data provider, a repository acting as a mirror of another (mirror) and an alternative repository (secondary). All data sources are provided by GNSS data repositories from
multiple agencies – regional, national, EUREF and others.
The infographic shows the flow within EPOS from submission of RINEX data (and control of metadata by the M3G Centre) to the dedicated EPOS GNSS analysis centres that compute positions, velocities and strain. The long term monitoring of data in EPOS is carried out by the Quality Monitoring Centre (not part of GLASS package). GNSS Data and Product gateways are the main point of access to the users – also the EPOS Integrated Core Services (ICS) will use these to get metadata from the GNSS Thematic Core Service.
Data/Products portal architecture with web interface.
► EPOS GNSS Data gateway also offers access to data from EUREF stations belonging to EPOS through interface with regional and historical EUREF data repositories.
► EPOS GNSS Product gateway also offers access to EUREF products: European reference frame, weekly station positions, and densified EUREF solution.