Ilija Grgić, Maro Lučić, Davor Kršulović, Elizabeta Babić, Ivan Malović

Size: px

Start display at page:

Download "Ilija Grgić, Maro Lučić, Davor Kršulović, Elizabeta Babić, Ivan Malović"

Cody Beasley
5 years ago
Views:

1 Ilija Grgić, Maro Lučić, Davor Kršulović, Elizabeta Babić, Ivan Malović STATE GEODETIC ADMINISTRATION EUREF symposium Chisinau, Moldova

2 HEIGHT SYSTEMS IN CROATIA HVRS1875 I. Leveling of high accuracy (I. NVT) HVRS71 II. Leveling of high accuracy (II. NVT)

3 Austrian Precise Levelling (APN) normal orthometric height system mean sea level tide gauge Trieste 1 year observation (1875) HEIGHT SYSTEM HVRS I. Levelling of High Accuracy new lines and benchmark stabilization heights taken from the APN numerous deficiencies: origin point, different instruments and procedures, long period of time

4 former Yugoslavia II. levelling of high accuracy normal orthometric height system mean sea level five tide gauges 18.6 years long observations (epoch ) measurements - unified and clearly specified scientific and technical criteria partial gravity measurements I. and II. NVT level lines differ HEIGHT SYSTEM HVRS71 systematic data processing and adjustment has been done 20 years after measurements official reference height system - HVRS71 (2004) height diff.: HVRS1875-HVRS71: cm

5 16 levelling polygons 448 levelling lines classification by levelling method HEIGHT SYSTEM HVRS71 Order Number of benchmarks (1973) Revision ( ) Revision ( ) 81% Levelling of high accuracy (II.NVT) (57%) Levelling of high accuracy (I.NVT) (44%) Precise levelling (PN) (37%) Technical levelling of increased accuracy (TNPT) (36%) Technical levelling (TN) (28%) TOTAL: (41%)

6 HEIGHT SYSTEM RECONSTRUCTION NETWORK DESCRIPTION LEVELLING METHOD A. ORDER Reconstruction of the II.NVT lines new infrastructure tide routes gauges 0th order 20 levelling polygons lines km 85 levelling lines 1st order levelling polygons levelling of high accuracy levelling of high accuracy B. Reconstruction lower of order, the lower city order precise networks levelling, 2nd order networks, trigonometric levelling islands 3rd order 4th order technical levelling, precise levelling, trigonometric levelling technical levelling, precise levelling, trigonometric levelling TOLERANCE [mm] L=length [km] 2 L 2 L 3 L 5 L 6 L

7 HEIGHT SYSTEM RECONSTRUCTION LEVELLING BENCHMARKS: LINES: old reconstruction stabilizations: of II NVT lines: 2166 km new stabilizations: levelling lines: km total number: length: km

8 HEIGHT SYSTEM RECONSTRUCTION HUNGARY SLOVENIA SERBIA BOSNIA AND HERZEGOVINA Connection with neighbour countries: Hungary UELN (1997) Slovenia, Bosnia and Herzegovina, Serbia, Montenegro MONTENEGRO

9 HEIGHT SYSTEM RECONSTRUCTION BENCHMARK NAME CONVENTION xyyyyzzzz x = type of stabilization (number) y = number of benchmark z = line number Order Line number Benchmark number Description tide gauges lev. polygons low order, city networks

10 HEIGHT SYSTEM RECONSTRUCTION BOSNIA AND HERZEGOVINA MONTENEGRO

11 CONNECTION WITH CROATIAN ISLANDS 11 Adriatic islands 14 networks / connections trigonometric levelling distance: 2 6 km accuracy: 2 cm

12 GRAVITY NETWORKS

13 CONCLUSION Reconstruction of the height system in Croatia will include many tasks in next few years: - finalization of the second order gravity network, - re-observation of the 0. order gravity network and stabilization of new points absolute gravity measurements, - connection of the gravity network with neighbour countries, - new adjustment of the gravity networks, - improvement of the actual geoid model HRG GNSS/levelling measurements (12-24h) - define the project stages of the height system reconstruction - geometric levelling and gravity measurements, - definition of the new vertical datum.

14 Ilija Grgić, Maro Lučić, Davor Kršulović, Elizabeta Babić, Ivan Malović STATE GEODETIC ADMINISTRATION EUREF symposium Chisinau, Moldova

Quality evaluation of height movement kinematic model of the Earth s crust on the Croatian territory

GEOFIZIKA VOL. 34 2017 DOI: 10.15233/gfz.2017.34.1 Preliminary communication UDC 550.347.62 Quality evaluation of height movement kinematic model of the Earth s crust on the Croatian territory Nevio Rožić