Dutch Permanent GNSS Array (DPGA)

Archive of news items

Four tide-gauges with continuously operating GNSS operated by NSGI have been added to the network. Data from HHO2 (Hoek of Holland) is available from May 2021. DHEL (Den Helder) and HARL (Harlingen) were installed on resp. June 2 and June 8, 2022. DELZ (Delfzijl) became operational just recently on 18th of August, 2022. [25 August 2022]

June 26, 2022, a new IGRS (Integrated Geodetic Reference Station) in Epen, South-Limburg, became operational. The station is co-located with an absolute gravity point and seismometers of KNMI. The station is installed on an underground concrete bunker, 7 meters in height (1 m below the surface), and on bedrock from the Carboon. The station was installed with the help of students during the GRS fieldwork in 2022. [30 June 2022]

May 1st, 2022, the RTCM3.1 NTRIP datastreams APEL0, DLF10, EIJS0, ... , WSRA0 (all NTRIP mountpoints with short 5 letter names XXXX0) will be terminated. Users of these NTRIP data streams are adviced to switch to the corresponding mountpoints XXXX00NLD0 which provide the same data in RTCM3.3 MSM format. [4 April 2022]

The receiver and antenna for DELF00NLD were replaced on February 24th 2022 with a multi-GNSS receiver. DELF00NLD is now providing highrate, hourly and daily RINEX-3 files and NTRIP data streams. [24 February 2022]

From now on all multipath, signal-to-noise and cycle slip statistics are based on daily RINEX-3 files. The statistics include GPS, Galileo, Glonass and Beidou systems. The old RINEX-2 statistics (GPS and Glonass only) will remain available until the last station has transitioned to RINEX-3 and after that as historic data. The visualisation of the statistics has been improved using dynamic charts which are refreshed once per day [25 Januari 2022]

March 1st 2022 [updated] we will stop dissiminating and archiving data in the legacy RINEX-2 format. Today, RINEX-3 (which was first release d in 2007) is the preferred format for the exchange of GNSS data. Historic data will remain available in the RINEX-2 format, and for the past few years, data was available both in RINEX 2 and RINEX 3 to easy the transition. As of 1 March 2022, GNSS data will be available only in RINEX-3 format. This has been delayed by 2 months until the last station has switched to RINEX-3. [16 December 2021, 24 February 2022]

Since Monday 8 November 2021 (day 312), 12:00 UTC, the high-rate RINEX-3 files for stations CBW1 and VLIE are not anymore generated from data streams, but replaced by receiver generated high-rate RINEX-3 data file. [15 November 2021]

Since Thurday 4 February 2021, 15:00 UTC, high-rate RINEX-3 files for the stations AMEL, APEL, EIJS, IJMU, SCHI, TERS, TXE2 and VLIS are replaced by high-rate RINEX-2 files generated by the receiver (formerly files were created from data streams), and now use the _R_ in the filename. High-rate RINEX-3 files for the stations CBW1 and VLIE are still generated from the data streams (_S_). [4 February 2021]

Tuesday 26 January, around 9:00 UTC, this server migrated to new hardware. It runs now a virtual server with Redhat Enterprise 8 SE-Linux. There was a small one hour interuption in the services during the migration. [26 January 2021]

On 28 February 2020 a third Integrated Geodetic Reference Station (IGRS) has been added to the network. The IGRS is equiped with a PolaRx5 receiver and is located at the "Veldschuur" in Rouveen, Overijssel. The station is operated by TU Delft on behalf of Deltares in the framework of "Nationaal Onderzoeksprogramma Broeikasgassen Veenweide" (NOBV). [28 February 2020]

The GNSS station CAB2, at the Remote Sensing location of the Cabauw Experimental Site for Atmospheric Research, has been stopped and the antenna and mast were removed on February 27, 2020, at 7:15 UTC. CBW1 is not the only functioning GNSS station at Cabauw. [27 February 2020]

On 7 February 2020 a second Integrated Geodetic Reference Station (IGRS) has been added to the network. The IGRS is equiped with a PolaRx5 receiver and is located at the "Kennis Transfer Centrum (KTC) Zegveld", in Zegveld, Utrecht. The station is operated by TU Delft on behalf of Deltares in the framework of "Nationaal Onderzoeksprogramma Broeikasgassen Veenweide" (NOBV). [7 February 2020]

RINEX data statistics are computed on-the-fly, including Rinex-3 files and for all systems. Older statistics include only GPS and GLONASS, and are only available for Rinex-2 daily and hourly data. [2 January 2020]

The GNSS station CABW, at the Cabauw Experimental Site for Atmospheric Research, has been replaced with an Integrated Geodetic Reference Station (IGRS), consisting of a GNSS antenna and receiver, with ascending and descending InSAR corner reflectors, and a LIDAR GCP. The IGRS is installed on the concrete block that was previously used for the CABW mast. The new monument and data stream have been given a new name to mark this upgrade. The new name is CBW1. The CBW abbreviation is also in line with the station identification used for meteorological sensors at the site. The new CBW1 monument is about 4 cm to the South, 1 cm to the East and 46 cm lower than the previous monument. [16 May 2019]

Daily RINEX files for a new station, VSLF in Delft, operated by the Van Swinden Laboratory (VSL) of the Dutch Metrology Institute (NMI), has been added to the local data center. VSLF uses a Septentrio POLARX4TR timing receiver with the receiver clock is synchronized with the Dutch timing standard. Only daily RINEX files, from 2012 onwards, are available. [18 January 2018]

All historic RINEX3 files have been renamed to the new naming convention and moved to the regular ./rinex directory tree. RINEX3 files now use the long names like DLF100NLD_20160610000_01D_30S_MO.crx.gz, the RINEX2 files use the old naming style with short names like dlf10610.16d.Z. Furthermore, highrate and hourly RINEX3 data from before January 1, 2016, have been packed in daily zip files like DLF100NLD_2015256UUUU_01H_10S_MO.crx.zip and DLF100NLD_2015256UUUU_15M_01S_MO.crx.zip that can be found in the regular hourly and highrate RINEX repositories. [2 April 2016]

Three new AGRS.NL stations have been included in the data center. The new stations are: AMEL (Ameland), SCHI (Schiermonnikoog) and TXE2 (Texel). All three stations are located on the Wadden-Islands nearby underground NAP benchmarks. TXE2 is colocated at a tide-gauge. The data is now available from the regular repository [1 March 2016]

IJMU (IJmuiden) and VLIS (Vlissingen), both colocated at tide-gauges, have become part of the EUREF Permanent GPS network. Routine data uploads to BKG and OLG start March 216. [1 March 2016]

Starting March 1, 2016, the RINEX3 file naming convention is used for all RINEX version 3 data (DLF1, WSRA). For instance, the 30 s daily RINEX 3 observation file for DLF1 is now called DLF100NLD_20160610000_01D_30S_MO.crx.gz. The old naming style, dlf10610.16d.Z, is reserved for RINEX version 2 files only. The newly named files will be placed in the regular ./rinex directories. Until the end of March 2016, symbolic links in the ./rinex3 directory using the old naming style will be available to help smooth out the transition. [1 March 2016]

A new station was build at the Kootwijk site to replace the ailing KOSG station. The 4 letter abbreviation of the new stations is KOS1, with DOMES number 13504M005. The new station is located 700 meters from KOSG, and operates a Septentrio PolaRx4 receiver with LEIAR25.R3 LEIT antenna. [18 June 2013]

The GPS antenna type at CABW has been damaged and was replaced by a different type. There is a small offset in position and height. [17 March 2012]

Data in the new RINEX version 3 format is now available for a few multi GNSS receivers. The data is served from a dedicated parent directory ./rinex3 with subdirectories for daily (30 sec), hourly (10 sec) and highrate (1 sec, 15 minute files) data. [1 June 2011]

The server has been migrated to a new location and domain: http and ftp services are now provided from gnss1.tudelft.nl. Http connections to the old server (gnss1.lr.tudelft.nl) are re-directed to the new server, however, ftp access is only available through the new server. Our apologies for any inconvenience this may cause. [20 Dec 2010]

A new station VLIE (Vlieland) has been added. VLIE is co-located with a tide-gauge station at the Dutch coast and a primary underground marker from the National height datum (NAP). VLIE is the fourth station that is co-located with a tide-gauge; other stations co-located to tide-gauges are TERS (Terschelling), IJMU (IJmuiden) and VLIS (Vlissingen). VLIE is operated by the Kadaster. [2 Dec 2010]

For more information or questions contact Hans van der Marel.