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Multi-frequency, multi-constellation, GNSS observations at low-cost tectonic GNSS stations in Greece

The TectoVision GNSS network in Greece was set up using European Research Council funding in partnership between German and Greek institutions. The project aims to deepen our understanding of suspected microplate motions in Greece. A total of 72 GNSS stations are planned for the TectoVision network. Two types of GNSS station equipment is used, reflected by the 4 character station ID. Stations with ID beginning with 'TT' were installed using the tinyBlack receiver. The stations with ID beginning 'TM' were set up using the Minimum Cost GNSS System (MCGS) design. RINEX (v3.05 as of May 2024) data at 30 seconds sampling interval are provided. Most of the data are sent over mobile internet via routers that are connected to the receivers via LAN cable. If required, the RINEX files can be converted to other versions using the GFZ software GFZRNX (Nischan, 2016). Raw observation data can be made available upon specific request. Hardware: The GFZ developed tinyBlack receiver combines cost efficient L2C GNSS receivers (here Swiftnav Piksi) with PC-based data logger package, internal storage, and interfaces. The control software is designed for remote operation ensuring long-term continuous tracking. The tinyBlack receivers provided by the GFZ spin-off maRam UG (Germany) are installed in combination with Harxon GPS500 survey antennas. The tinyBlack stations provide GPS (L1/L2), GLONASS (G1/G2), and Galileo (E1/E5b) data. The low-cost MCGS stations are coming in 2 versions from a GNSS technology transfer project at GFZ. Both versions operate a ublox F9P receiver and an integrated chip-antenna with a pyramidal antenna radome. One version provides GPS (L1/L2), Glonass (G1/G2), Galileo (E1/E5b) and also Beidou (B1/B2) data. The other version (currently only 3 systems installed) is designed for low power operation in remote areas with data telemetry over a narrrow bandwidth radio link. This version delivers only GPS (L1/L2) data without doppler observations at a reduced data rate of 60 seconds. Monumentation: There is a variety of monumentation for these stations, with the design of the monumentation being low-cost. Most are connected to a thread that is attached to a stainless steel pin which is glued into masonry or bedrock. Most sites are installed on rooftops of public buildings. The MCGS is sometimes clamped to an existing sturdy pole connected to the roof of the building. Some stations are connected to an extending stainless-steel arm that we have drilled into the side of a building. Photos of the station are provided with the standard GNSS station log-files (as metadata). If the instrumentation at existing monuments is later changed to other hardware types, the station ID retain the original TT and TM 4-character IDs. Metadata: Station-specific metadata records are stored in IGS sitelog files available via ftp.

GFZ Global Ionosphere Maps

This data publication contains global maps of the vertical total electron content (VTEC) of the Earth's ionosphere. They are computed at GFZ from ground GNSS data and provided on an operational basis. The dataset covers the period since the beginning of 2000 and is published in daily files.

GFZ repro3 product series for the International GNSS Service (IGS)

GFZ acts as a global analysis center of the International GNSS Service (IGS) and provides operationally ultra-rapid (last 24h), rapid (last day), and final (last week) solutions and contributes to the reprocessing activities of the IGS. The GFZ repro3 product solution series covers data from 1994 to 2020 and is published in daily and weekly files. The following satellite systems are contained: GPS (from 1994), GLONASS (from 2012), and Galileo (from 2014).

SEMISYS - Sensor Meta Information System

SEMISYS is the Sensor Meta Information System of the German Research Centre for Geosciences. The precise analysis of GNSS observation data is based upon a variety of metadata from different sources, including station and satellite metadata. A high evaluation quality must be ensured by the consistency and integrity of this metadata. The station and satellite metadata are currently maintained in ASCII based files that make the extraction of key information used for the data evaluation difficult. To get rid of the restrictions caused by the file based metadata management, the Operational Data Center (ODC) group of the GFZ developed a Sensor Meta Information System (semisys) for the central, format independent and validated storage of station and satellite metadata based upon client/server technology and an object-relational database. The following processing related metadata is currently stored in semisys: * Station metadata extracted from IGS site logs (for different projects) * Processed station coordinates (EPOS) and ocean loading values (calculated by Onsala Space Observatory) * Hardware metadata (receiver, antenna, radome) * Satellite parameter for GPS, GLONASS, Galileo, BeiDou, QZSS and SBAS * Notice Advisories for GPS, GLONASS and Galileo (NANU, NAGU) * ANTEX for GPS, GLONASS and Galileo

GFZRNX - RINEX GNSS Data Conversion and Manipulation Toolbox (Version 1.05)

GFZRNX is a software toolbox for Global Navigation Satellite System (GNSS) data provided in the REceiver Independent EXchange format (RINEX) of the major versions 2 and 3. The following RINEX data types are supported: - Observation data - Navigation data - Meteorological dataThe following global and regional satellite systems are supported:GPS - Global Positioning System (USA) GLONASS - GLObal NAvigation Satellite System (RUS)BEIDOU - Chinese Global and Regional Navigation Satellite System (CHN)GALILEO - European Global Navigation Satellite SystemIRNSS - Indian Regional Naviagation Satellite System (IND)QZSS - Quasi Zenith Satellite System (JAP) The following operations/tasks are supported: - RINEX data check and repair - RINEX data format conversion ( version 3 to 2 and vice versa ) - RINEX data splice - RINEX data split - RINEX data statistics generation - RINEX data manipulations like: (1) data sampling, (2) observation types selection, (3) satellite systems selection, (4) elimination of overall empty or sparse observation types - Automatic version dependent file naming on output data - RINEX data header editing - RINEX data meta data extraction - RINEX data comparisonThe following operating systems are supported: - Microsoft Windows (64) - Microsoft Windows (32) - Apple macOS - ORACLE Solaris (SPARC) - ORACLE Solaris (i86) - Linux (64) - Linux (32) Please find the executables and the Documentation via: http://semisys.gfz-potsdam.de/semisys/scripts/download/index.php (GFZ Software -> gfzrnx)

eSDI-Net+ - Netzwerk zur Förderung des grenzübergreifenden Dialogs und Austausch von Best Practices zwischen Geodateninfrastrukturen (GDIs) innerhalb Europas

*Das EU-Projekt eSDI-Net+ wird im Rahmen des eContentPlus Programms der EU durchgeführt. Das übergreifende Ziel des Projektes ist es, einen Dialog zwischen den Hauptakteuren im Bereich Geodaten anzuregen, der sich von der lokalen bis auf die europäische Ebene erstreckt. Dieser Dialog soll dabei helfen, das Bewusstsein der Akteure für die Chancen von INSPIRE zu schärfen, einen nachhaltigen Erfahrungsaustausch anzuregen und Umsetzungsvarianten zu erörtern. Die damit geschaffenen Kommunikations- und Kooperationskanäle werden darüber hinaus dazu beitragen, die Möglichkeiten und den Nutzen von Geodateninfrastrukturen (GDIs) auch unter den professionellen Geodatennutzern und den Bürgern - ebenfalls potentielle Nutzer - weiter zu verbreiten. - Etablierung eines thematischen Netzwerks als Kommunikationsplattform unter Interessenverretern, die in den Aufbau und die Nutzung von GDIs involviert sind. - Vernetzung potenzieller GDI Interessenvertreter, um Bewusstsein zu schaffen und das Entstehen von Leitfäden, Standards und guten Praxisbeispielen zu erleichtern. - Aufbau von Kommunikationsmechanismen zwischen der europäischen und lokalen Ebenen, um die positiven Auswirkungen von INSPIRE, GMES, GALILEO und e-government Programmen zu stärken. - Entwicklung von Lösungen für multikulturellen und multilingualen Zugang, Verwertung und Nutzung digitaler Geoinformationen (GI) in Europa. Innerhalb der letzten 2 Jahre wurde eine 'Methodologie zur Beschreibung von subnationalen GDIs' geschaffen, die im nächsten Schritt zu einem vollständigen 'Bewertungssystem' mit definierten Kriterien, Indikatoren, gewichteten Indizes, etc. weiterentwickelt wurde. Dieses System dient dazu subnationale GDIs zu beschreiben und zu evaluieren. Im Rahmen von 12 nationalen und regionalen Workshops, die europaweit in den jeweiligen Landessprachen durchgeführt wurden, wurde dieses Bewertungssystem bei der Evaluierung von 135 GDIs aus 26 Ländern getestet. Diese Workshops verfolgten primär die folgenden Ziele: - Identifikation und Dokumentation von relevanten existierenden lokalen, regionalen und nationalen SDI-Initiativen. - rkennen von gemeinsamen Problemen sowie Lösungen, mit denen gute Erfahrungen gemacht wurden. Zusätzlich zu den Workshops wurden in Fragebögen und persönlichen Interviews gemeinsame Kernpunkte als Basis für die Bewertung adressiert: Benutzerintegration, Benutzerfreundlichkeit, Daten und Service Qualität und Quantität, sozio-ökonomische Auswirkungen der GDI sowie Subsidiarität und Nachhaltigkeit. Das Ergebnis dieses Prozesses war die Nominierung von 12 herausragenden GDIs - Best Practices - durch eine internationale Jury. Im November 2009 fand die abschließende Etappe des Projekts statt, die eSDI-Net+ International Conference in Turin, Italien. Um die nationalen Initiativen auf einer europäischen Ebene zu vereinen, bekamen alle 12 ausgewählten Best Practice GDIs die Möglichkeit sich selbst und ihre Lösungen zu präsentieren. usw.

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