Prof Emeritus Rod Blais, Geomatics U of Calgary telah meninggal dunia pada 27 Jun lalu. Berita kematian beliau dilapor dalam IAG Newsletter keluaran September. Rod Blais meninggal pada usia 67 tahun. Blais adalah graduan Matematik Loyola College (kini Concordia Uni) dan PhD Surv Eng UNB. Berita awal turut dilapor oleh Uof C (link).
Blais
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International Association of Geodesy (IAG) telah melantik Official baru untuk memegang tugas sepanjang period 2019 hingga 2023. Senarai penuh mereka adalah seperti senarai berikut:
IAG Official 2019-2023
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)
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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.
Markku Poutanen
(source – nlsfindland)
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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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IUGG General Assembly is been held in Montreal from July 8 to 18.
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A phd thesis entitled “The application of crustal models in regional modelling of the Earth’s gravity field” was written by Matej Varga (b.1989) of Zagreb University in 2018 (link – zagrebgeodesy). The work was supervised by Tomislav Basic and Dimitris Tsoulis. Varga started by enrollment in Oct 2012, and passed in his proposal in 2015. Varga has benefited from computational coding shared by among others Carl Christian Tscherning (1942-2014), René Forsberg, Mario Brkic, Ramazan Alpay Abbak and Jianliang Huang.
Contents:
Introduction
Theory – fundamentals of gravitational field, topographic reductions, geoid determination.
Research – data, study area and software; residual gravity field modelling; KTH approach; RcR approach;
Conclusion and future research
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A paper “Comparative analysis of Vening-Meinesz Moritz isostatic models using the constant and variable crust-mantle density contrast – a case study of Zealandia” co-authored by Bagherbandi and Tenzer. The paper is 10 pages long and was published in JESS 2013.
Read it here – link.
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Published by Springer. Edited by Grafarend.
Encyclopedia of Geodesy
Attitude determination;
Best integer prediction in mixed models;
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Buku terbitan tahun 2002.
Tycho & Kepler
The story of how Copernicus replaced the prevailing geocentric view of the universe with his heliocentric model is a familiar one. Less familiar are Tycho Brahe’s contributions to astronomy and his influence on Johannes Kepler, who revolutionized 17th-century thinking about planetary movements. Science writer Ferguson’s intellectual and cultural biography of these two seminal scientists provides a delightful, detailed look into the ways that each man developed his ideas about the universe. Brahe, a Danish nobleman, developed a variety of instruments for observing the heavens. In his observatory off the coast of Denmark, he built a magnificent armillary-an instrument that allowed him to construct his theory that Venus and Mercury orbit the Sun while the Sun and the outer planets orbit the unmoving Earth. In 1600, Brahe took on a brilliant young student named Kepler, whom Brahe asked to carry on his own work after his death. Though indebted to Brahe for his instruments and his detailed charts of the stars, ultimately Kepler departed from Brahe’s views, confirming instead Copernicus’s theory that all the planets orbit the Sun. More famously, he discovered that the planets had elliptical rather than circular orbit.
Contents:
mm
1B geobaca
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Sebuah tesis mengenai Kepler dan astronomi boleh diperolehi dari James Cook University Australia. Tesis bertajuk Kepler’s war on Mars and the usurpation of seventeenth-century astronomy. Tesis dikemuka oleh William Anthony Robert Dorsey untuk degree Doctor of Astronomy pada 2012. Tesis di kategori sebagai Professional Doctorate (Research).
Chp 1 Introduction
Chp 2 Johannes Kepler – the making of a revolutionary
Chp 3 Tradition vs innovation
Chp 4 Principle from Physics
Chp 5 Through Physics
Chp 6 Subject matter: to physics – physical astronomy
Chp 7 The reception of Kepler’s new astronomical ideas
Chp 8 The epitome of Copernican Astronomy
Chp 9 Keplerian Astronomy after Kepler
Chp 10 Conclusion
Link – eprints. jcu.edu.au/29931/
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