Due to the occurance of coordinate jumps, the station coordinates given in the tables below are valid for a specific period in time (indicated in the first column). The coordinate jumps are caused by station-specific equipment changes (see station log and/or EPN_discontinuities.snx).

To obtain the station positions at an epoch t different from t0, apply the station velocities: X(t) = X(t0) + (t-t0)*VX; Y(t) = Y(t0) + (t-t0)*VY; Z(t) = Z(t0) + (t-t0)*VZ

1. POSITIONS/VELOCITIES PUBLISHED BY EUREF

EUREF has classified FOYL00GBR (Londonderry, GBR) as a class A station which means that it can used as fiducial station for EUREF densifications.

LATEST RELEASE

C2175 (December 15, 2021)

EPN_ETRF2000_C2175.SNX.Z

ETRF2000 epoch t0 Position (m) Velocity (m/y)
X Y Z VX VY VZ
116/2008 - 261/2021 001/2010 3638083.489 ± 0.000 -468414.859 ± 0.000 5200402.323 ± 0.000 -0.0005 ± 0.0000 -0.0002 ± 0.0000 0.0004 ± 0.0000
259/2006 - 114/2008 001/2010 3638083.486 ± 0.000 -468414.864 ± 0.000 5200402.318 ± 0.000 -0.0005 ± 0.0000 -0.0002 ± 0.0000 0.0004 ± 0.0000

EPN_ETRF2014_C2175.SNX.Z

ETRF2014 epoch t0 Position (m) Velocity (m/y)
X Y Z VX VY VZ
116/2008 - 261/2021 001/2010 3638083.449 ± 0.000 -468414.904 ± 0.000 5200402.370 ± 0.000 0.0001 ± 0.0000 0.0001 ± 0.0000 0.0010 ± 0.0000
259/2006 - 114/2008 001/2010 3638083.446 ± 0.000 -468414.909 ± 0.000 5200402.365 ± 0.000 0.0001 ± 0.0000 0.0001 ± 0.0000 0.0010 ± 0.0000

EPN_IGb14_C2175.SNX.Z

IGb14 epoch t0 Position (m) Velocity (m/y)
X Y Z VX VY VZ
116/2008 - 261/2021 001/2010 3638083.205 ± 0.000 -468414.574 ± 0.000 5200402.571 ± 0.000 -0.0115 ± 0.0000 0.0158 ± 0.0000 0.0105 ± 0.0000
259/2006 - 114/2008 001/2010 3638083.202 ± 0.000 -468414.579 ± 0.000 5200402.566 ± 0.000 -0.0115 ± 0.0000 0.0158 ± 0.0000 0.0105 ± 0.0000
plus_minus
PREVIOUS RELEASES

2. POSITIONS/VELOCITIES PUBLISHED BY THE IGS

IGS has not yet released coordinates for FOYL00GBR (Londonderry, GBR).

3. POSITIONS/VELOCITIES PUBLISHED BY THE IERS

LATEST RELEASE

ETRF2000-R14.SSC (October 4, 2016) - ITRF2014_GNSS.SSC.txt (January 21, 2016)

ETRF2000(R14) epoch t0 Position (m) Velocity (m/y)
X Y Z VX VY VZ
000/0000 - 000/0000 001/2010 3638083.488 ± 0.001 -468414.859 ± 0.001 5200402.322 ± 0.001 -0.0003 ± 0.0001 -0.0003 ± 0.0000 0.0006 ± 0.0001
ITRF2014 epoch t0 Position (m) Velocity (m/y)
X Y Z VX VY VZ
000/0000 - 000/0000 001/2010 3638083.204 ± 0.001 -468414.574 ± 0.001 5200402.571 ± 0.001 -0.0113 ± 0.0001 0.0157 ± 0.0000 0.0107 ± 0.0001
plus_minus
PREVIOUS RELEASES

4. POSITION PUBLISHED WEEKLY IN THE EPN COMBINED SOLUTION

IGb14 epoch t0 Position (m) Velocity (m/y)
X Y Z VX VY VZ
290/2021 - 296/2021 293/2021 3638083.066 ± 0.000 -468414.390 ± 0.000 5200402.694 ± 0.000 NANANA

5. POSITIONS PUBLISHED BY THE COUNTRY

The official ETRS89 coordinates used in GBR are maintained by Ordnance Survey / LPS Nothern Ireland. This agency is fully responsible for the information kindly provided to the EPN:

Valid (from - to) epoch t0 Position (m) Velocity (m/y)
X Y Z VX VY VZ
239/2016- now 277/2009 3638083.487 -468414.861 5200402.326 NANANA
299/2006- 238/2016 001/2000 3638083.485 -468414.868 5200402.325 NANANA

Following a recent initiative of the EUREF Technical Working Group (Monitoring of official national ETRF coordinates on EPN web), the differences between the national coordinates and the latest cumulative EPN solutions (section 1) are regularly monitored. They are given in two maps: [horizontal differences] and [vertical differences].