When you are going to use the data as reference station you will need accurate coordinates for the station marker, at the epoch of measurement, and in a well defined reference frame. The coordinates given in the RINEX headers are, according to the RINEX standard, only approximate coordinates. For the RINEX files on this website we try to provide the official values in the RINEX header, but accuracy and backward compability is not guarantied (new coordinate realizations are not propagated backwards into older RINEX files). As a general statement, approximate coordinate values from the RINEX headers should not be used, except for selection and plotting purposes.
When it comes to coordinates there is not a single solution. First, you have to decide for which reference system and reference frame you want to have coordinates for. There are broadly two options: a global or a regional reference frame.
The International Terrestrial Reference System (ITRS) provides a global reference frame (ITRF). Station coordinates in the International Terrestrial Reference Frame (ITRF) at the epoch of measurement can be computed as follows
X(t) = X(t0) + V(t0) * (t - t0)with X(t0) and V(t0) the ITRF coordinates and velocities at the reference epoch t0. Velocities, which are of the order of a few centimeter per year, are the result of tectonic plate motion. Different realizations of ITRF are available, indicated by ITRF<year>, with slightly different coordinates and velocities. This is because of continuous improvements in the realization of the reference frame and new measurements that become available. The most recent realization of ITRS (ITRF2000 and ITRF2000-u2023) can be found on the ITRF web site (please note that only some stations on this web-site are available through this web site).
When you are looking for coordinates that don't change much over time the solution you probably want to use a regional reference frame. For Europe this is the European Terrestrial Reference System 1989 (ETRS89). ETRS89 moves along with the Eurasian tectonic plate. Velocities in ETRS89 are therefore much smaller than velocities in ITRF (often less than a few millimeters per year) and are only due to intra-plate motion and autonomous station motion. For most applications velocities in ETRS89 can be neglected. Coordinates in ETRS89 are also improved on a continuous basis, due to improvements in the measurement and analysis techniques, the underlying models that are used, and growing amount of data. These improvements are captured in different realizations (releases) of ETRS89, such as ETRF2000 and ETRF2014.
Coordinates and velocities in ETRS89 (ETRF2020, ETRF2014, ETRF2000, published by the country) and ITRS (ITRF2020) can be found on the EUREF Permanent Network (EPN) website Positions & Velocities page. Please note that positions and velocities are only available for stations that are processed by IGS and EPN analysis centers.
The Dutch Kadaster provides official coordinates, in ETRF2000(R05) at epoch 2010.5, for all AGRS.NL stations. These are the coordinates that should be used for land surveying activities in the Netherlands. These are also the coordinates that are used in the RTCM data streams. The coordinates in ETRF2000(R05), at epoch 2010.5, are
STATION MARKER X (M) Y (M) Z (M) LAT (DEG) LON (DEG) H (M) AMEL00NLD 13540M001 3787664.3179 382392.2630 5100339.6159 53.446461328 5.764892667 60.6299 APEL00NLD 13510M001 3895237.0684 406814.3175 5017378.0574 52.211921558 5.962293635 115.8820 CBW100NLD 13536M001 3923113.3276 338135.2473 5000752.1854 51.969543622 4.926179569 45.5743 DELF00NLD 13502M004 3924687.7039 301132.7618 5001910.7712 51.986117237 4.387584037 74.3573 DELZ00NLD 13547M001 3789710.9777 460843.7266 5092371.1152 53.326514152 6.933349694 52.2916 DHEL00NLD 13549M001 3836789.0458 318401.2089 5068116.6046 52.963207233 4.743898891 47.9711 DLF100NLD 13502M009 3924698.1145 301124.8040 5001904.9911 51.986016057 4.387456949 75.8211 EIJS00NLD 13533M001 4023086.5352 400394.8606 4916655.3317 50.758237695 5.683605973 103.7857 HARL00NLD 13548M001 3814004.8279 361287.8653 5082327.1526 53.175681419 5.411289859 51.7044 HHO200NLD 13546M001 3926788.6987 282838.4177 5001306.4724 51.977545010 4.119781083 52.9907 IJMU00NLD 13537M001 3882053.2677 309346.2085 5034330.2213 52.461971157 4.556057722 54.0458 KOS100NLD 13504M005 3899613.9605 397361.6236 5014738.6355 52.173355273 5.818225436 104.7856 SCHI00NLD 13541M001 3782171.4309 408355.7871 5102376.9286 53.477325267 6.162274582 50.9745 TERS00NLD 13534M001 3798580.8808 346993.8533 5094780.8151 53.362735734 5.219385690 56.0953 TXE200NLD 13542M001 3829292.8761 324999.2460 5073333.5315 53.041065728 4.851174175 51.3112 VLIE00NLD 13539M001 3805256.1483 339064.9332 5090357.9035 53.296223325 5.091856723 53.4650 VLIS00NLD 13538M001 3975805.2237 249950.0832 4964446.0850 51.442875072 3.597324646 54.3980 WSRA00NLD 13506M005 3828736.1392 443304.7363 5064884.5236 52.914608245 6.604501679 82.2805 WSRT00NLD 13506M005 3828736.1392 443304.7363 5064884.5239 52.914608246 6.604501679 82.2807These coordinates have been computed using data from 2020 following EUREF guidelines (source: Coordinaten AGRS stations (in Dutch) , current meta data at the Kadaster GNSS data server). The height is the height above the GRS80 reference ellipsoid.
For the non AGRS.NL stations, such as the Integrated Geodetic Refernce Stations (IGRS), coordinates have been computed by the Kadaster in the same AGRS.NL reference frame using one week of data, these are
STATION MARKER X (M) Y (M) Z (M) LAT (DEG) LON (DEG) H (M) ENSC00NLD 13552M001 3885922.4207 467742.1277 5019229.5678 52.239526177 6.863578648 77.8767 EPEN00NLD 13545M001 4020950.5014 417728.2793 4917061.9981 50.763134490 5.931064373 183.9382 MASL00NLD 13550M001 3931376.6393 292054.2101 4997198.7793 51.917648418 4.248586255 53.2489 ROVN00NLD 13544M001 3859571.7993 413007.6702 5044091.5501 52.60628995 6.10790273 44.5778 STWK00NLD 13551M001 3923154.0209 327267.5140 5001437.0286 51.979549599 4.768544118 44.3200 VBZH00NLD 3908170.6303 301864.0425 5014673.1886 52.17296353 4.41671191 55.7724 ZEGV00NLD 13543M001 3908910.3815 330932.7740 5012262.5917 52.13779401 4.83918588 43.5295If you need coordinates in ITRF then you can use the EPN ETRF/ITRF transformation service.
In case you want coordinates in WGS84 then it becomes a bit tricky. Although WGS84 is alligned with ITRF at the decimeter level, it is not identical to any of the afore mentioned reference frames. Often, WGS84 is used as an encompassing term for ITRF or ETRS89, which is certainly okay at the meter level accuracy, but not specific enough for the centimeter and decimeter type of applications. Should you ever be in doubt about which reference frame to use, and your area of interest is the Netherlands, then most likely it is ETRF2000 and you should use the coordinates published by the Dutch Kadaster. If this is not the case, and you are using data from more than one station, please make sure that all coordinates refer to the same reference frame.
Velocities for station in the ITRF are provided by ITRF, Jet Propulsion Laboratory (JPL), EUREF/ITRF Positions & Velocities, and others. The EUREF/ITRF Positions & Velocities web-page also provides station velocities in ETRS89, including additional stations that are not in ITRF.
Another great resource is the Nevada Geodetic Laboratory, they provide station velocities MIDAS Velocity Field for almost all GNSS stations with an open data licence, which includes most of the Dutch GNSS stations.
Station time series are available for various resources:
For more information or questions contact Hans van der Marel.