KTH Combined Topographic Correction

The additive corrections in the KTH approach involved  four separate corrections and the combined topographic correction is the first to be dealt with. The list follow gives the reference readings on the combined topographic correction;

Sjoberg (2000) Topographic effects by the Stokes-Helmert method of geoid and quasi-geoid determinations. J of G 74:255-268

Sjoberg (2001) Topographic and atmospheric corrections of gravimetric geoid determination with special emphasis on the effects of harmonic of degrees zero and one. J of G 75:283-290

Sjoberg (2007) The topographic bias by analytical continuation in physical geodesy. J of G 81:345-350

Vermeer (2008) Comments on Sjoberg (2007) J of G 82:445-450

and answered by Sjoberg in;

Sjoberg (2008) Answers to comments by Vermeer. J of G 82:451-452

Sjoberg (2009) The terrain correction in gravimetric geoid determination – is it needed? GJI 176:14-18

[Taken from Ssengendo et.al (2015) – bind H01 – paper 2]

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Ehwal Persempadanan Sebatek 2019

 

Akhbar Indonesia menerbit satu artikel 'Polemik bertahun-tahun batas Indonesia-Malaysia di Pulau Sebatik diukur ulang'.

Source - skpt sebatik dan liputan6 2019.

Suasana batuan dan gunung Kashmir

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Recipients of the Weikko A Heiskanen Award

The Division of Geodetic Science OSU has continued presenting the Heiskanen award to outstanding geodesist. The award was started in 1959 with the first three awardees was Clarence Robert Johnson followed by Jesse Schreiter (1960) and Mar Ann Hmphre (1961). Given below is the list of Heiskanen Award winners for the past ten years (Senior Award);

2016 – Thomas J Johnson (NGA Project Scientist; also former NASA program manager)

2015 – Wenbin Shen (PhD Graz 1996; Professor at Wuhan; Guest Scientist Stuttgart)

2014 – Michael Durand (PhD UCLA 2007;  Assoc Prof Earth Science OSU)

2013 – Michael Schmidt (PhD 1990 Bonn; DGFI Munchen; Professor TU Munchen)

2012 – Jun Yi Guo (Senior Research Scientist, Earth Sciences OSU)

2011 – Kamil Erkan (Post-doc OSU; OSU Report 488-2008 & 509-2015; Professor CE Dept, Marmara University Istanbul)

2010 – Pierre Desjardins (Trimble Navigation Westminster CO)

2009 – Matthew S Platz

2008 – Michael G Bevis

2007 – Jay H Kwon

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IAG Official 2019-2023

IAG telah memilih official baru yang memegang tugas untuk period 2019 hingga 2023. Senarai penuh mereka adalah seperti berikut;

President – Zuheir Altamimi (France)

Vice President – Richard Gross (USA)

Secretary - Markku Poutanen (Finland)

Commission 1 Reference Frame - Christopher Kotsakis (Greece)

Commission 2 Gravity Field – Adrian Jaggi (Switzerland)

Commission 3 Earth Rotation & Geodynamic – Janusz Bogusz (Poland)

Commission 4 Positioning & Application Allison Kealy (Australia) [Melb Uni]

Service Rep Position 1 Johannes Bohm (Austria)

Service Rep Position 2 Tom Herring (USA) [MIT Boston]

Service Rep Position 3 Toshimichi Otsubo (Japan)

Members at Large 1 Sonia Costa (Brazil)

Members at Large 2 Yamin Dang (China)

President of the Communication and Outreach Branch – Szabolcs Rozsa (Hungary) [BUTE]

Inter-Com Committee on Theory – Pavel Novak (Czech Republic)

Editor in Chief Journal of Geodesy – Jurgen Kusche (Germany)

Editors IAG Series - Jeff Freymueller (USA)

Jualan sayuran Tasik Dal

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IAG New Secretary

Markku Poutanen telah dilantik sebagai secretary baru IAG. Beliau menggantikan Hermann Drewes. Poutanen adalah dari National Land Survey of Finland. Lantikan beliau bermula pada sesi 2019.

Currently, Poutanen is the Director of the Geodesy and Geodynamics Dept at FGI.

Poutanen

(source - nlsfinland)

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Bacaan Geoid Indonesia

Usaha untuk menerbitkan geoid baru bagi Indonesia sedang rancak berjalan. Untuk mengetahui perkembangan kajian tentang geoid di Indonesia ada beberapa sumber bacaan yang boleh membantu.

"Geoid of Jakarta" Dadan Ramdani et al (2015) BIG - 6 pages.

"Updating model geoid Indonesia" Pahlevi, Dyah Pangastuti, et al. BIG - 10 pages.

"Study of satellite gravity over the Sumatran earthquake region"  Bhattacharrya et. al - 7 pages.

"Geoid after the eruption of Merapi in 2010" UGM and Semarang - 6 pages.

"Combination of gravity disturbances and gravity anomalies for geoid determination: a case study in Semarang City, Central Java" Heliani et al (2018) IEEE paper.

"Precise Indonesian gravity fields determination from combination of surface gravity, altimeter and DTM data" Heliani and Fukuda Kyoto - 6 pages

"Estimation of marine gravity anomaly model from satellite altimetry data (case study: Kalimantan and Sulawesi Waters-Indonesia" Pangastuti, Pahlevi & Hwang (2018)

"Permodelan geoid kota Surabaya ..." Tesis ITS, 2017

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Height Network and Geodynamic Effects

Height network is one of important geodetic infrastructures needed in any country. The normal practice of establishing height network is by levelling network which requires bench marks been placed at suitable locations.  A good practice of keeping the bench marks height up-to-date requires the network been measured repeatedly at appropriate time interval. Another consideration is to look at the effect of geodynamics to such height network.

In order to understand how the geodynamic factors impacted levelling network lets review the following articles;

“Impacts of geodynamic phenomena on systems for height and gravity” Martin Ekman, Bull Geod 63, 1989. 16 pages.

“Geodynamical studies using gravimetry and levelling” PhD Dissertation, Jaakko Makinen 2000, U of Helsinki, 18 pages.

“To determination of the heights on geodynamic and technogenic polygons” Lviv Uni Ukraine, Geodesy and Cartography, Vol 44, No 2, 2018.

Another interesting readings;

“On the use of repeat levelling for the determination of vertical land motion: artifacts, aliasing,  and extrapolation errors” Featherstone, Filmer – JGR Solid Earth 2018 (link)

“Vertical crustal movements based on precise levelling data in Estonia” Tarmo Kall, PhD thesis, Tartu Uni 2016, 236 pages – (link)

“Towards worldwide height system unification using ocean information” Woodworth, Hughes, Bingham & Gruber, J of GS, 2(4) 2012 – 17 pages.

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