naslovnica

IF JCR (2020): 0.551
IF SNIP (2020): 0.417
ISSN: 0351-0271
e-ISSN: 1581-1328
COBISS.SI ID: 5091842
UDK: 528=863
Zveza geodetov Slovenije
Publisher:
Association of Surveyors of Slovenia
Zemljemerska ulica 12, SI-1000 Ljubljana
E-mail: info@geodetski-vestnik.com
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Ocena razlik med višinskim datumom Južne afrike in datumom mednarodnega višinskega referenčnega sistema

Estimation of vertical datum offset for the South African vertical datum, in relation to the international height reference system

Author(s):

Matthews Siphiwe Mphuthi, Patroba Achola Odera

Abstract:

The vertical offset and the geopotential value over South Africa is estimated on the four fundamental benchmarks in relation to the international height reference system (IHRS). It is estimated to obtain discrepancies between the South African local vertical datum (W_P) and the global vertical datum (W_0). A single-point-based geodetic boundary value problem (GBVP) approach was used following Molodensky theory for estimating the height anomalies from the disturbing potential (T_P) using Bruns’s formula. The gravity potential at each tide gauge benchmark (TGBM) in South Africa deviates from the potential of the global reference surface by 0.589,-1.993,-2.593 and 2.154 m2s-2 for Cape Town, Port Elizabeth, East London and Durban, respectively. The corresponding vertical datum offsets between the international height reference system and the four fundamental benchmarks over South Africa are 6.013, -20.347, -26.478, and 21.996 cm for Cape Town, Port Elizabeth, East London and Durban, respectively. These offsets can be used for the unification of the South African vertical datum at the four tide gauge benchmarks in a manner that is consistent to the international height reference system.

Keywords:

Geoid, quasigeoid, geopotential, vertical datum, disturbing potential, height anomaly

DOI: 10.15292/geodetski-vestnik.2021.02.282-297

Citation:

Matthews Siphiwe Mphuthi, Patroba Achola Odera (2021). Ocena razlik med višinskim datumom Južne afrike in datumom mednarodnega višinskega referenčnega sistema. | Estimation of vertical datum offset for the South African vertical datum, in relation to the international height reference system. Geodetski vestnik, 65 (2), 282-297. DOI: 10.15292/geodetski-vestnik.2021.02.282-297

ISSN: 0352-3551
EISSN: 1581-0267
COBISS: 3664386
UDK: (05) 532;556;626/628.6
Zveza geodetov Slovenije
Publisher:
Association of Surveyors of Slovenia
Zemljemerska ulica 12, SI-1000 Ljubljana
E-mail: info@geodetski-vestnik.com
CC