Nearly sixty students and staff members visited the fundamental station Wettzell in the Bavarian forest in the
course of the bi-annual excursion in space geodesy. Wettzell is the first station worldwide to operate twin telescopes
(see this picture with one of the dishes), it is the
only station with a ringlaser, and it also has satellite laser ranging devices and many more instruments.
On 1 May 2014 TU Vienna was host of a meeting on the interactions of celestial and terrestrial
reference frames, topic of Sub-Commission 1.4 of the International Association of Geodesy (IAG)
chaired by Johannes Böhm. The participants
(see photo) discussed possibilities
to strengthen the frame ties and the requirements for the next International Celestial Reference
Frame (ICRF). More information is available here.
The Vienna VLBI Software (VieVS) developed and maintained within our Research Group has active users
all over the world. Therefore, Hana Krásná was invited to the Hartebeesthoek Radio Astronomy
Observatory (HartRAO) in South Africa to held an extensive VieVS training course (15 - 17 April, 2014)
and to answer tricky questions of users who already use VieVS in their everyday research
After four years of extensive foundational research at TU Vienna, Michael Schindelegger successfully defended his PhD
thesis on atmosphere-induced
short period variations of Earth rotation. Within the obligatory rigorosum, questions were
coming thick and fast, but the testee could demonstrate his knowledge on the nature of atmospheric tides,
their impact on Earth rotation parameters, and the quality of present-day atmospheric/oceanic circulation
models on sub-diurnal time scales. The high-profile committee included
Prof. Harald Schuh (TU Vienna and GeoForschungsZentrum Potsdam), Prof. Florian Seitz (TU München),
Prof. Aleksander Brzezinski (Warsaw University of Technology), and Prof. Johannes Böhm, all of which
are captured together with Michael Schindelegger in this
Johannes Böhm is spending three weeks at the University of Tasmania to schedule, simulate, and observe a continuous VLBI campaign over 15 days with telescopes in Australia, South Africa, and New Zealand. After two weeks of iterations with the great help of the former colleague Jing Sun, schedules were developed which where finally started on 28 November 2013 at 21 UTC (see this picture together with Jim Lovell, Auscope VLBI manager). Now it is time to cross the fingers ...
Gregor Möller (research group Advanced Geodesy) was awarded by the Institute of Navigation (ION) for the best paper presented at its 26th Technical Meeting of the Satellite Division, see this certificate. His talk was on improved blind tropospheric models for the Global Navigation Satellite Systems.
A splendid autumn day provided the perfect setting for the seventh edition of the annual 3 km Hermannskogel-run from Weidling (260 m NN) up to fundamental point of Austrian surveying at the Habsburgwarte (542 m NN). Among the twelf participating geodesists (see group photo), three runners completed their summit attempt below 17 minutes. They posed for a winner snapshot together with the two female participants, see here. The award ceremony and the dinner took place at Gasthof Waldgrill as usual.
On September 9-10, 2013, the fourth Workshop for users of the Vienna VLBI Software (VieVS) was held at the research group Advanced Geodesy. Participants/lecturers came from all over the world (Australia, Russia, South Africa, Czech Republic, Japan, Poland, Spain, Germany and Turkey) and gathered for a group photo in front of the University building.
As a joint effort by many members of the research group Advanced Geodesy in the last years, a textbook on atmospheric effects in space geodesy has been compiled (editors Johannes Böhm and Harald Schuh) and finally been published by Springer. More information can be found here.
From 13 to 15 May 2013, the research group Advanced Geodesy had its bi-annual retreat at the Hohe Wand, Lower Austria (see group photo). Future scientific plans were discussed along with organizational issues and other topics of interest. Of course we used the nice weather and landscape to do same hiking and we visited an animal farm.
On 14 March 2013, Kamil Teke had his farewell party before going back to his home university (Hacettepe University in Ankara). It was very nice having Kamil in our group for the last eight months, and we wish him all the best for his future!
The deviation from ideally uniform and point-like radio sources (known as source structure effects) observed by VLBI is well known, but efficient strategies to correct for this effect still need to be developed. The Vienna University of Technology and the University of Tasmania (Stas Shabala and Jamie McCallum together with Johannes Böhm during their visit at the GEO Department) now started joint investigations in this field. Using the Vienna VLBI Software (VieVS), structure effects and consequences on VLBI products will be studied by both groups. In the course of this collaboration, Prof. Böhm is invited as visiting scholar to Hobart next November/December.
The 21st Meeting of the European VLBI Group for Geodesy and Astrometry (EVGA) was held in Espoo, Finland from 5 to 8 March 2013. For the first time this assembly was following a 4-day VLBI school which was attended by a large group of students, from master-level to VLBI experts. The VLBI group of the GEO department contributed with a lecture on atmosphere in VLBI (Johannes Böhm), five talks and a poster. Besides the purely scientific sessions, the whole VLBI community once more showed its unity and several arrangements for future collaborations could be discussed. This let us nearly forget about the snow storms and -7° temperature.
After six eventful years at TU Vienna, M. Alizadeh successfully defended his Ph.D. thesis on multi-dimensional modeling of ionospheric parameters with an impressive talk and detailed answers to the challenges of his examiners, Prof. Harald Schuh (GFZ Potsdam), Prof. Michael Schmidt (DGFI München), Assoc. Prof. Manuel Hernandez-Pajares (Technical University of Catalonia) and Prof. Robert Weber. He then invited the audience to a small celebration (view photo) with a lot of Iranian specialities, also waving farewell to his colleagues since he will move to GFZ Potsdam by the end of February. We wish M. Alizadeh all the best for his scientific carrer and family life.
Two interesting and profilic rigorosa were held in quick succession at the research group Advanced Geodesy: On 31 January 2013, Hana Krásná defended her Ph.D. thesis 'Estimation of solid Earth tidal parameters and FCN with VLBI' and was equal to the task of answering the comprehensive questions of her examiners, Prof. Harald Schuh (GFZ Potsdam), Prof. Rüdiger Haas (Chalmers University of Technology, Gothenburg), Prof. Johannes Böhm, and Dr. Jan Vondrák (Czech Academy of Sciences, Prague). The following day, it was Jing Sun's turn to defend her thesis 'VLBI scheduling strategies with respect to VLBI2010' against the challenges of Prof. Harald Schuh, Dr. John Gipson (Goddard Space Flight Center), Prof. Rüdiger Haas, and Prof. Johannes Böhm. Afterwards, the relieved testees, Hana Krásná and Jing Sun, celebrated with their examiners and colleagues.
On December 18, Maria, Virginia and Tobias had their farewell party at the research group Advanced Geodesy since they will start at GFZ Potsdam on 1 January 2013 in the newly established VLBI group there. We wish them all the best for their future!
On 12 December 2012, all members of the resarch group Advanced Geodesy went to Kunsthistorisches Museum where we had a guided tour through the highlights of the museum. Thereafter, we moved on to the Augustinerkeller for our End-of-the-Year-Party. After dinner, Johannes and Robert were summarizing the organisational changes and scientific highlights of the past year.
From 3 to 7 December 2012, the Fall Meeting of the American Geophysical Union (AGU) took place in San Francisco with more than 20.000 participants. Nina Magnet and Johannes Böhm from the research group Advanced Geodesy went there to give poster and oral presentations about regional ionospheric modelling and GPT2, an improved tropospheric delay model, respectively. The picture was taken by Thomas Hobiger.
On 1 November 2012, Harald Schuh started his new job as Head of
Department 1 at
Geoforschungszentrum Potsdam. On that occasion we had coffee and some "Strudels" on his
last workday at the research group, and he got a
running shirt showing VLBI telescopes
in Vienna and Berlin and the "Bayern-Munich-Correlator". We wish Harald all the best
for his new duties and nice runs around the Telegrafenberg!
On October 25th Sigrid Böhm successfully finished her doctorate studies with the
obligatory Rigorosum. After presenting her extensive research on
Tidal excitation of Earth
rotation observed by VLBI and GNSS in a comprehensive talk (see this
snapshot), she impressively demonstrated
her knowledge in the answers to the questions of her
examiners, Prof. Harald Schuh and
Prof. Aleksander Brzezinski (Warsaw University of Technology).
Only a few days later Dr. Böhm started her new position as University Assistant at TU Vienna.
The INTERGEO, a yearly conference and trade fair for geodesy,
geionformation and land management, was held from 9 - 11 October in Hannover, Germany. Dr. Tobias
Nilsson and Michael Schindelelegger travelled along with Prof. Schuh to give the audience an
insigth in the geophysical excitation of Earth rotation within the scientific part of the conference called
GEODETIC WEEK. See the
two lecturers at the entry of the conference hall.
On 5 October 2012, Johannes Böhm gave a presentation at the Gymnasium Zwettl about Earth rotation and how it can be observed. He also provided information about studying "Vermessung und Geoinformation" at the Vienna University of Technology. It was a "home game" for him because he went there to school from 1982 to 1990. Also on the picture are Manuela (his wife), a pupil, and his brother Reinhard who teaches Mathematics and Geometry at the Gymnasium Zwettl.
On 25 July 2012, there was a friendly between the national men's teams of Austria and Germany in Basketball. Lucia Plank was one of the referees and she did a very good job. She had three supporters from TU Vienna (Hana, Kamil and Johannes).
The sixth edition of the famous annual Hermannskogel-run for geodesists attracted a lot of sportive students and members of the reseach group. Under hot weather conditions, seven brave runners managed the 3 km track from Weidling up to the summit in about 16 to 25 min. Most of the participants, however, preferred to walk from the layby at Cobenzl up to the finish. After the sportive part, we visited the fundamental point of Austrian surveying (see group photo) and met for dinner at Gasthof Waldgrill, where the fastest runners were honoured.
On 29 Jun 2012, the private Austrian broadcasting company ATV reported about the leap second which takes place at the end of June 2012. For that reason they had an interview with Robert Weber on that issue. The clip can be watched here (go to 'Fr. 29.6.2012', in German, the first five minutes).
On 28 June 2012 Jungho Cho from the South Korean Astronomy and Space Agency (KASI) successfully defended his PhD thesis at Bonn University. Following an old Bonn tradition the doctor-father (Axel Nothnagel) and the external reviewer (Johannes Böohm) had to pull the 'car' of the candidate.
On 21/22 June 2012 the research group Advanced Geodesy had its excursion to the fundamental station Wettzell in Bavaria. 36 students and 13 members of the research group took part and were impressed by the facilities in Wettzell.
On 13 June 2012 Tobias Nilsson received the Best Paper Award 2010 of the Faculty for Mathematics and Geoinformation of the Vienna University of Technology the article which he published together with Rüdiger Haas in the Journal of Geophysical Research. The paper has the title: Impact of atmospheric turbulence on geodetic very long baseline interferometry. The laudatio was given by Johannes Böhm. The picture shows Dr. Tobias Nilsson presenting his award together with Prof. Dr. Harald Schuh and Assoc. Prof. Dr. Johannes Böhm.
On 25 April 2012, a meeting of IAG Sub-Commission 1.4 ("Interaction of Celestial and Terrestrial Reference Frames") was held at the Vienna University of Technology. The interaction between the frames has become an important issue in the last years, in particular due to the different estimation strategies of the ITRF (combination of normal equations from different space geodetic techniques) and ICRF (VLBI-only solution). In total 18 participants took part, some of them are on the group photo.
From 22 to 27 April 2012 the General Assembly of the European Geosciences Union took place at the Austria Center in Vienna. Many of us participated with oral and poster presentations. The picture shows the participants of the research group Advanced Geodesy and friends in front of the Austria Center.
On February 21-22 Harald Schuh, Johannes Böhm, Sigrid Böhm, Michael Schindelegger
and Tobias Nilsson participated in the annual status seminar of the research unit on
"Earth Rotation and Global Dynamical Processes" (FOR584), held in Frankfurt am Main, Germany.
This research unit - which is funded by the German Research Foundation (DFG) - is a cooperation
between several institutions in Germany, Austria, and Switzerland doing research in about
various aspects of Earth rotation. In total, ten projects are run within this unit, out of which
the research group Advanced Geodesy is mainly contributing to one (project P8, SPEED).
For more information, see the
homepage of the research unit.
» View group photo
There has been a report about Lucia Plank in the magazine TU|frei.haus. Lucia Plank is not only working on spacecraft tracking with Very Long Baseline Interferometry, but she is also the only female referee in the Austrian men's professional basketball league. More information can be found here
A successful year 2011 for the research unit Advanced Geodesy was solemnized with a combination of cultural experience, sportive teambuilding and opulent dinner. The HG Christmas party, alias end-of-year event, started with a guided tour through the Burgtheater, where we were informed about the theatre's history, but also today's stage live and could take a look behind the scenes. The afternoon activities were split into three sports categories: one group accepted the challenge of figure ice skating at Eislaufverein, another group trained their running skills and the third group went hunting for the last or first Christmas presents. All three groups reconvened in the evening to enjoy a delicious meal and a thrilling award ceremony in Augustinerkeller.
From 16 to 25 November 2011, Johannes Böhm was visiting professor at the Space Geodesy
Group (GEGE) at the Universidade Estadual Paulista (UNESP) in Presidente Prudente, Brazil.
He was giving lectures on Very Long Baseline Interferometry and atmospheric effects in
space geodesy, and he was discussing future co-operation with Prof. João Francisco Galera
Monico. His research stay made it to the local newspaper O Imparcial.
» View article
The Journées 2011 'Systèmes de référence spatio-temporels' with the sub-title
'Earth rotation, reference systems and celestial mechanics: Synergies of geodesy and astronomy'
have been successfully held at Bundesamt für Eich- und Vermessungswesen
(BEV), Vienna, from 19 to 21 September 2011.
Organized by the research group Advanced Geodesy, the conference saw about 100 participants from
over 20 different countries presenting and discussing their work in the fields of space-time
reference systems, Earth rotation, solar system ephemerides, as well as astrometry and time.
» Journées 2011 website / » TU News "Wo ist im Weltraum rechts?"
The 2nd User Workshop of the Vienna VLBI Software (VieVS) has been held at the
Institute of Geodesy and Geophysics (TU Vienna) from 14 to 16 September 2011.
VieVS is a software package developed and maintained in Matlab by the Research
Group Advanced Geodesy for the analysis of Very Long Baseline Interferometry (VLBI)
observations. These observations are essential to determine the full set of Earth
orientation parameters and to realize the International Celestial Reference Frame.
» VieVs website
Tuesday evening we organized a barbecue in honor of our dear colleague and friend Dudy Wijaya,
who, after two and a half years, is now leaving our group and returning to his home university
in Bandung, Indonesia. We spent highly pleasant hours on the terrace with excellent food prepared
by our chef Banoub, drinks, light chit-chat and a very emotional speech given by Dudy himself.
We wish him all the best for his upcoming career at ITB and congratulations and all the
happiness in the world to him and his fiancée for their wedding and future together.
» View group photo
On 29 June 2011, during the IUGG General Assembly in Melbourne, the Guy Bomford Prize of the
International Association of Geodesy (IAG) for outstanding contributions to geodetic studies
was awarded to Johannes Böhm for his contributions to geodetic studies of atmospheric effects
on microwave measurements (VLBI, GNSS, DORIS). The Guy Bomford Prize is awarded to a young
scientist or to a team of young scientists for outstanding theoretical or applied contributions
to geodetic studies, particularly in the four year period preceding the General Assembly at which
the award is made.
The Guy Bomford Prize Lecture can be downloaded here.
On Monday afternoon, members of the research group followed Ana Karabatic's invitation for a farewell-barbecue on our
terrace. With food, drinks, sun, and wind, we spent a very nice time together, which hopefully
Ana will remember among many other things happening during her 5 years at IGG. After successfully
defending her Ph. D. thesis in spring, Ana will look for future challenges in Switzerland.
For this, and also in her private life, all members of IGG wish her good look and all the best.
» View group photo
Kamil Teke successfully defended his Ph.D. thesis on 'Sub-daily parameter estimation in VLBI data analysis' at the Institute of Geodesy and Geophysics. Afterwards, the examiners as well as the members of the research group were invited to a small celebration on our terrace. We wish Dr. Teke the best for his future geodetic work in Turkey.
Every two years our research group travels to a quiet place to discuss about the work and results of the individual colleagues as well as the future plans and reorginazition withing the research group. This year our retreat took place at the Gasthof Postl at Hohe Wand, Lower Austria.
Three new papers, first-authored by members of the research group Advanced Geodesy, have been published online in a special issue of Journal of Geodesy:
Multi-technique comparison of troposphere zenith delays and gradients during CONT08
Kamil Teke, Johannes Böhm, Tobias Nilsson, Harald Schuh, Peter Steigenberger, Rolf Dach, Robert Heinkelmann, Pascal Willis, Rüdiger Haas and Susana García-Espada, et al., DOI: 10.1007/s00190-010-0434-y
» View Abstract
High-resolution atmospheric angular momentum functions related to Earth rotation parameters during CONT08
Michael Schindelegger, Johannes Böhm, David Salstein and Harald Schuh, DOI: 10.1007/s00190-011-0458-y
» View Abstract
Universal time from VLBI single-baseline observations during CONT08
Tobias Nilsson, Johannes Böhm and Harald Schuh, DOI: 10.1007/s00190-010-0436-9
» View Abstract
Prof. Dr. Harald Schuh was awarded the Vening-Meinesz Medal of the European Geoscienes Union (EGU) for his
work in the field of Very Long Baseline Interferometry (VLBI) and his important contribution to space
geodetic research. The award ceremony and the public medal lecture took place in the frame of the EGU
2011 General Assembly, 3-8 April, in Vienna.
» View EGU Resumé
Ana Karabatic successfully defended her Ph.D. thesis at the Institute of Geodesy and Geophysics and invited the members of the research group to a small celebration afterwards.