The GNSS Product portal has gained a fresh and modern design improving the user experience (UX). “The initial design and usability were deprecated, therefore we decided to reformulate it”, says André Rodrigues, from UBI and the developer in charge of portal redesign. According to Rodrigues, besides having minor details such as a “welcome screen”, the reformulation implied a new design taking into consideration user interface and usability.
To achieve the goal, EPOS GNSS:
► facilitates access to relevant and validated GNSS data, metadata, and data products
► coordinates the archiving of relevant GNSS data, metadata and data products
► promotes best practice for GNSS station operation, data quality control and data management
► maintains and distributes open source software for GNSS data, metadata and product discoverability
► maintains and develops GNSS data products
The EPOS Thematic Core Service GNSS Data and Products has developed an open source platform, called GLASS, to store and disseminate data and metadata from GNSS stations operating in Europe. In collaboration with EUREF, various GLASS nodes are linked together to provide a single point of access through web portals to: validated GNSS station metadata, the GNSS data itself and derived GNSS products such as position time series, velocities and strain rate maps.
a new way of accessing GNSS data and products for Solid Earth Science researchers
GNSS Products Portal – The portal enables access to the GNSS observations and products. Graphical interfaces enable station visualization and multiple queries over stations and associated metadata allowing users to retrieve the desired information. At the GNSS Product portal is possible to download derived GNSS products such as position time series, velocities and strain rate maps.
Data Gateway Portal –This is an e-infrastructure to store and disseminate GNSS data and products from existing Research Infrastructures. The portal stores EPOS stations metadata and enables access to the GNSS observations and products. The GNSS Data Gateway is where people can search for available GNSS data from all over Europe, including EUREF Permanent GNSS Network (EPN) data.
M3G Portal – The portal where operational centres (which operate the GNSS stations) can upload information about the type of instrument and antenna they are using, when it was installed, which type of receiver, contact information, name of station and network etc. M3G is the central access point for operational centers to upload the log-files of their GNSS stations.
Virtual Machine – To distribute the software to the various partners, the UBI team has put together a virtual machine, or simply VM, with most of the software that all partners have been developing pre-compiled and installed.
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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.