Geodetic Department KTIMATOLOGIO S.A. (Hellenic Cadastre) K. Katsampalos, C. Kotsakis Department of Geodesy and Surveying

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1 Realization of ETRS89 in Greece by the HEPOS network M. Gianniou i Geodetic Department KTIMATOLOGIO S.A. (Hellenic Cadastre) mgianniu@ktimatologio.gr K. Katsampalos, C. Kotsakis Department of Geodesy and Surveying Aristotle University of Thessaloniki kvek@topo.auth.gr, kotsaki@topoauth.gr

2 Outline The HEPOS Project Tectonic activity in Greece HEPOS network adjustment Transformation ITRS - ETRS89 Definition of HTRS07 Maintaining HTRS07 coordinates in the presence of tectonic movements

3 The HEPOS Project Framework of establishment part of the project Information and Technology Infrastructure for a modern Cadastre a CSF-III project, co-funded by the European Regional Development Fund HEPOS was deployed in 2007, in less than 12 months supports other CSF-III projects, i.e. production of orthophoto maps for whole Greece

4 The HEPOS Project HEPOS Network Reference Stations 87 Networked Reference Stations (VRS -FKP-MAC) 11 single Reference Stations

5 The HEPOS Project Reference Stations of HEPOS 98 Trimble NetRS receivers with Trimble Zephyr Geodetic antennae with domes.

6 Tectonic activity in Greece Known facts Official ETRF00 velocities of six EPN stations published by EUREF STATION V X (m/y) V Y (m/y) V Z (m/y) V (m/y) KOSG WTZR GRAZ AUT NOA TUC

7 Tectonic activity in Greece Known facts

8 Tectonic activity in Greece Example of zero trend: Station 070A Recent results Easting of station 070A Aug-07 Nov-07 Feb-08 Jun-08 Sep-08 Dec-08 Mar-09 Jul-09 Oct-09 Jan-10 Northing of station 070A Aug-07 Nov-07 Feb-08 Jun-08 Sep-08 Dec-08 Mar-09 Jul-09 Oct-09 Jan-10

9 Tectonic activity in Greece Example of constant trend: Station 007A Recent results Easting of station 007A Aug-07 Nov-07 Feb-08 Jun-08 Sep-08 Dec-08 Mar-09 Jul-09 Oct-09 Jan-10 Northing of station 007A Aug-07 Nov-07 Feb-08 Jun-08 Sep-08 Dec-08 Mar-09 Jul-09 Oct-09 Jan-10

10 Tectonic activity in Greece Example of constant trend plus abrupt change: Station 064A Recent results Easting of station 064A Aug-07 Nov-07 Feb-08 Jun-08 Sep-08 Dec-08 Mar-09 Jul-09 Oct-09 Jan-10 Northing of station 064A Aug-07 Nov-07 Feb-08 Jun-08 Sep-08 Dec-08 Mar-09 Jul-09 Oct-09 Jan-10

11 Tectonic activity in Greece Recent results Estimated displacements caused by an earthquake (longest arrow corresponds to 2.1 cm)

12 Tectonic activity in Greece Recent results Displacements (in ITRF2005) of the HEPOS stations with respect to station 041A occurred from 11/2007 to 11/2009 (preliminary, unpublished results)

13 HEPOS network adjustment 14 days of observations Processing using Bernese ver. 5 (processed dby IGN-Spain) Variance factor: Std. Deviation of coordinates: between and Repeatability: better than 2 mm for the horizontal components and about 5 mm for the vertical component

14 Transformation ITRS ETRS89 Memo Boucher/Altamimi At the time realization of HTRS07, version 6 of the B/A memo was valid. Step 1: Step 2: Step 3:

15 Transformation ITRS ETRS89 Followed approach regarding step 3 of the memo At the time of realization of HTRS07, no velocities were available for the HEPOS stations. Furthermore, as shown before, the velocity field in Greece is very complex. The velocities of the Greek stations differ strongly among each other. Any application of individual velocities would distort the homogeneity of the HEPOS network. For these reasons, no transformation to t = was done. Note: According to the current version of fthe B/A memo (version 7) it is no longer recommended to propagate the station coordinates by means of whatever intra plate velocities to other epoch than the central epoch t c of the used

16 Transformation ITRS ETRS89 Memo Boucher/Altamimi The transformation of ITRF05/ coordinates to ETRF05/ using the B/A memo led to coordinates that differ from the coordinates computed using official EUREF coordinates and velocities by: ΔΧ ΔΥ ΔΖ AUT1 2 mm 6 mm 1 mm NOA1 1 mm 8 mm 1 mm TUC2 9 mm 6 mm 1 mm

17 Definition of HTRS07 Followed approach regarding step 2 of the memo Use official EUREF coordinates and velocities to compute ECEF coordinates of AUT1 in: - ITRF05/ (central epoch for HEPOS network adjustment) - ETRF05/ (central epoch of the HEPOS GPS campaign for the computation of transformation model) Compute the translation components ΔΧ, ΔΥ and ΔΖ between the above official ECEF coordinates of AUT1 Use of the above translation parameters to transform all HEPOS stations from ITRF05/ to ETRF05/

18 Definition of HTRS07 On the use of ETRF05 At the time of realization ation of HTRS07, ETRF05 was the current frame In version 7 of the B/A memo, TWG recommends not to use the ETRF2005 and rather to adopt the ETRF2000 as a conventional frame of the ETRS89 system Using EUREF coordinates and velocities available in 2007, the differences ERTR05 minus ETRF00 inthe coordinatesofaut1of were: DX = 0.012m, DY = 0.015m, DZ = 0.014m D 3D = 0.023m, D hor = 0.009m, D ver = 0.022m Using today s ETRF00 coordinates and velocities (given in the next slide), the differences are less, i.e.: DX = 0.005m, DY = 0.012m, DZ = 0.007m D 3D = 0.015m, D hor = 0.010m, D ver = 0.012m

19 Definition of HTRS07 On the use of ETRF05 Coordinates and velocities of AUT1 available on EUREF site in 2007 to X Y Z Vx Vy Vz ETRF Coordinates and velocities of AUT1 available on EUREF site today to X Y Z Vx Vy Vz ETRF Resulting coordinates of AUT1 in ETRF05 and ERTF00 t X Y Z ETRF ETRF

20 Definition of HTRS07 TM with 2 zones: Zone 1 Zone 2 λo = 24 E λo = 30 E ko = ko = φo = 0 φo = 0 Eo = m Eo = m No = m No = m Projection TM07 λ = 24 ο λ = 30 ο TM07 is based on TM87: A different No value is used ( m instead of 0.0m) to distinguish between TM87 and TM07 The use of same λo and ko ensures that the area of the parcels will remain practically unchanged when HTRS07 will replace HGRS87. In this way, legal and practical difficulties are avoided, and the adoption of HTRS07 as the new Greek GRS becomes easier

21 Definition of HTRS07 The definition of HTRS07: Summary Is in agreement with the general principle of EUREF-TWG, which states that: any new frame validated by the TWG would have minimum systematic shift with regard to the EUREF89 frame, but should stick to its own scale especially if it is significantly more accurate than the scale underlying EUREF89 (B/A Memo, section 1) Ensures that the maximum possible consistency between HTRS07 and ETRS89 in the northern part of Greece, i.e. on the borders between Greece and the other European countries Has been used to compute the official coordinates of the HEPOS stations Has been used to compute the official transformation model that is already implemented in RTK receivers and office-software packages.

22 Maintaining HTRS07 coordinates in the presence of tectonic movements A fundamental scope of ETRS 89 is to offer a highly accurate Reference System for Europe avoiding the dynamic character of ITRS This is being achieved to a very high degree for the countries in the stable part of the Eurasian plate. However, Greece - and particularly southern Greece - shows different tectonic behavior than Central Europe. KTIMATOLOGIO S.A. would like to discuss with the TWG the possible ways to treat this issue.

23 Maintaining HTRS07 coordinates in the presence of tectonic movements Velocities of Greek EPN stations The table gives the EPN stations sorted by their 3D velocities. NOA1&TUC2 show the greatest velocity vector, whereas AUT1 is in a much more stable. Station Vx Vy Vz V3D RAMO AUT DRAG VAAS VIL ALBA SKE HOFN PDEL THU KELY REYK QAQ TUBI ANKR NOA TUC

24 Maintaining HTRS07 coordinates in the presence of tectonic movements Velocity of AUT1 Velocities of AUT1 available on EUREF site today to Vx Vy Vz ETRF These velocities correspond to: D hor = 0.009m

25 Maintaining HTRS07 coordinates in the presence of tectonic movements A possible approach for the maintenance of HTRS07 coordinates: Adopt the TWG recommendation: keeping fixed the HTRS07 coordinates of a northern HEPOS station (e.g. 041A) Find solutions that ensure coordinate stability for the users.

26 Thank you! The HEPOS project is part of the Operational Program Information Society and is co-funded by the European Regional Development Fund

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