Journal of Geodesy (2003) 76: 586–596 DOI 10.1007/s00190-003-0311-z

IAG Newsletter Ole Baltazar Andersen IAG Central Bureau, Department of Geophysics, Juliane Maries vej 30, DK-2100 Copenhagen Ø, Denmark e-mail: [email protected]; Fax: +45 3536 5357; URL: http://www.gfy.ku.dk/~iag/

The IAG Newsletter is under the editorial responsibility of the IAG Central Bureau. It is an open forum and contributors are welcome to send material (preferably in electronic form) to the IAG Central Bureau. These contributions should complement information sent by IAG officials or by IAG symposia organizers (reports and announcements). Each IAG Newsletter includes several of the following topics: I. general information II. reports of IAG symposia III. reports by commissions, special commissions or study groups IV. symposia announcements V. book reviews VI. fast bibliography

H. Drewes C. Boucher S. Zerbini K. P. Schwarz P. Xu S. Takemoto

President Comm. VIII President Comm. X President Comm. XIV Past President Rep. IAG intercommission committee on theory President Comm. V

0. Memorandum The IAG honoured the past president of IAG P. A. Leppan and past secretary general of IAG J. J. Levallois. Both passed away in 2001. 1. Approval of agenda F. Sanso presented the agenda containing several additions, and this was approved.

Meeting report Minutes of the IAG-EC meeting in Nice 26. and 27. April 2002 The following were present. F. Sanso G. Beutler D. Blitzkow C. C. Tscherning O. Andersen A. Dodson C. K. Shum G. Boedecker C. Wilson V. Dehant

President First Vice President Second Vice President Secretary General Ass. Sec. General President Sec 1 President Sec 2 Secretary Sec 3 President Sec 5 Secretary Sec 5

Books for review are the responsibility of: Christian Tiberius TU Delft, Faculty of CEG, Dept. of Mathematical geodesy and positioning P.O. Box 5030 – NL 2600 GA Delft – The Netherlands Fax: (+31) 15 27 83 711 E-mail: [email protected]

2. Brief reports from each section (Section Presidents) The section presidents of section 1, 2, 3 and 5 reported that the sections are working well. The EC appointed C. Wilson to liaison with IERS in preparing a resolution on the celestial reference frame, which IAG can carry forward at the IUGG meeting in Sapporo. IERS should also be asked for a brief article for Journal of Geodesy on the celestial reference frame. 3. Report from the IAG planning committee G. Beutler presented the minutes from the planning committee meeting which had taken place the same morning. The minutes are available from http:// www.gfy.ku.dk/~iag/newstructure/newstructure.htm G. Beutler had received a proposal to set up an entity dealing with fundamental constants. The EC decided to establish a planning group, which should report at the IUGG2003 meeting in Sapporo. C. Wilson agreed to chair this planning group. G. Beutler and C. Wilson will

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make a letter to the head of the services with a request for nomination of a person to join the planning group. C. Tscherning reported on the establishment of an IAG outreach branch. The announcement had been widely distributed and published in the IAG newsletter. Until now only a few institutions had shown interest. K.-P. Schwarz stressed that the institutions should contribute with one full-time secretary. The EC decided that IAG must be active in finding a suitable place for the IAG outreach branch (C. Tscherning). 4. Report from the Planning Committee for the Intercommission Committee on Theory Peiliang Xu presented the report of the Intercommission Committee on Theory. P. Xu stressed the importance of establishing joint working groups with the different IAG commissions in the future structure. 5. Report from the planning committee on the IAG project G. Beutler distributed and presented the status report from the planning committee on the IAG project IGGOS, which was prepared at the third meeting of the group on Thursday 26 April. The EC approved to appoint G. Beutler to chair the IGGOS planning group until the IUGG meeting in Sapporo with H. Drewes serving as secretary.

the proceedings should be added to the registration fee. The EC decided to form an editorial board for this meeting. This will consist of 8 members: the convenors from each geodesy session, and F. Sanso. It was decided that this board should set up a clear set of rules for reviews and deadlines before the IUGG2003 meeting. The Joint Symposia chaired by the IAG will not be published as part of the IAG reviewed proceedings. The EC appointed C. Tscherning to liaison with the LOC and to prepare the final program. Abstracts will be handled by IUGG, but C. Tscherning was appointed to assist in the assignment of abstract to the different IAG sessions in corporation with the session convenors. O. Andersen was appointed editor by the EC for the 2003 version of the IAG Travaux and Geodesists Handbook. 8. IUGG2003 – General Assembly in Sapporo 2003 C. C. Tscherning reported on the preparation for the next IUGG meeting. IAG related meetings will be confined to 7 days (Wednesday, first week (July 2, 2003) to Thursday, second week (July 10, 2003). The EC will meet on Tuesday the first week (July 1, 2003). Each session has 1.5 days except for IGGOS which has two days. A preliminary time schedule was presented, see http://www.gfy.ku.dk/ ~iag/iugg03time. htm. 9. Nominations of IAG and IUGG officers

6. Comments received on the new Statutes and by-laws C. Tscherning reported on the comments received on the new statutes and by-laws from the National Committee of Poland. These are available on http://www.gfy.ku.dk/ ~iag/Compol.htm The EC decided to adopt the editorial changes suggested by the national representative of Poland. The suggestion of omitting the word astrometric in the description of commission 1 in the by-laws that reads: ‘‘Theory and coordination of astrometric observation for reference frame purposes’’, was not adopted. V. Dehant will contact the national representative of Poland. Updated Statutes and By-laws are available at the IAG website. K.-P. Schwarz agreed to look into reformulating the Statutes and By-laws on the subject of personal membership as this still causes some confusion. 7. Experience from the Budapest Scientific Assembly K.-P. Schwarz presented the report from the Budapest Scientific Assembly which has been published as part of the IAG newsletter in the Journal of Geodesy. All comments have been very positive, and the EC thanked K.-P. Schwarz and the LOC for the great work done in association with the Budapest meeting. The reviewed proceeding is in press with Springer. The EC discussed the publication of reviewed publications in association with the IUGG2003 meeting. It was decided to have reviewed proceedings and that the cost of

The nomination procedures for the IUGG and the IAG elections were presented by K-.P. Schwarz. A draft call for IAG nominations was discussed. The final call is available at http://www.gfy.ku.dk/~iag/ callnom.htm. It was considered important that a geodesist became a member of the new IUGG Bureau. The President and the Secretary General were asked to contact possible candidates. Proposals from the EC should be send to the Secretary General before June 1, 2003. 10. Resolution on permanent earth tides effects The issue was postponed to the next IAG meeting. 11. Best paper award Two of the three suggestions from the Editor in Chief of Journal of Geodesy P. Teunissen were send out for e-mail vote after the EC meeting to enable the members to read the papers. The winner of the award has subsequently been found, and is: S. Skone, Calgary. 12 Any other business K.-P. Schwarz mentioned that Springer will take over ‘‘GPS Solutions’’. IAG appointed C. Tscherning to keep in close contact with Springer to clarify how the best synergy with Journal of Geodesy could be obtained.

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United Nations and GNSS will have a meeting in Zambia in July. IAG should be represented at the meeting especially with respect to the AFREF. The EC appointed C. K. Shum, G. Beutler and A. Doodson to lead a planning group for an IAG project on GNSS. K.-P. Schwarz pointed out that there is a potential problems with the new IAG By-laws, as they opens for re-election of Commission presidents. This was not possible for Section Presidents in the old IAG by-laws. The EC decided to clarify the text as to ensure that Commission presidents can not be re-elected.

Book Review

13. Next meeting The next EC meeting will be held 10–11th April, 2003 in association with the joint EGS-AGU meeting in Nice, France. Ole B. Andersen IAG information editor Ninth Business Meeting of Ablos, held at the Hydrographic and Oceanographic Department, Japan Coast Guard, Tokyo, October 23–25, 2002 Meeting report is available at: http://www.gmat.unsw. edu.au/ablos/minutes02.pdf Tenth IAG International Symposium on Recent Crustal Movements, Helsinki, Finland, August 27–31, 2001 The tenth IAG (International Association of Geodesy) International, Symposium on Recent Crustal Movements (SRCM) was held in Helsinki, Finland, August 27.–31., 2001. The main organizer of the Symposium was the Finnish, Geodetic Institute. Co-organizers were the Department of Geology, University of Helsinki, Department of Geophysics, University of Helsinki, and Department of Surveying, Helsinki University of Technology. Scientific programme was planned together with Prof. Susanna Zerbini, University of Bologna, Italy, the president of the IAG Section V, Commission XIV, Crustal Deformation. More than 70 participants, and 60 presentations during the symposium show the importance and wide variety of the topic. Natural and athropozenic hazards was one of the topics, as a part of the crustal movements can be violent and rapid, causing both human and material losses. Some movements, although slow but still of a great importance, such as the postglacial rebound or the eustatic rise of the sea level, can help us to study and understand global changes, such as warming and its causes, and deglaciation. The proceedings of the Symposium will be published in the Journal of Geodynamics (JoG), an official journal of the European Geophysical Society. Markku Poutanen Finnish Geodetic Institute Secretary of the SRCM symposium Finland Ole B. Andersen IAG information editor

title: author: publisher: ISBN: year: price: pages: size: details:

Foundations of Time-Frequency Analysis Karlheinz Gro¨chenig Birkha¨user – Basel/Berlin/Boston 0-8176-4022-3 2001 85 Euro 359 16 · 24 cm hard cover

The power of standard Fourier analysis is that it allows the decomposition of a signal into individual monochromatic frequency components and establishes the relative intensity of each component. However, the classic Fourier spectrum can give only a global picture of the spectral behaviour of signals and it does not tell us when (for temporal signals) or where (for spatial signals) each frequency component mostly occurred. Timefrequency analysis, a relatively new branch of harmonic analysis, deals exactly with the problem of overcoming the localization deficiencies of the classic Fourier spectrum via the use of joint time-frequency signal representations. It was originally conceived by famous physicists (Weyl, Wigner, von Neumann) in the early thirties to answer certain questions in quantum mechanics, and it was ‘re-discovered’ by signal analysts (Ville, Gabor) during the late forties to assist in problems encountered in information theory and communication engineering. In simple words, time-frequency analysis is just a form of local Fourier analysis that treats both time and frequency simultaneously and symmetrically. It is a vibrant interdisciplinary area of research that bridges problems and ideas from engineering (signal analysis, communication theory, image processing), physics (quantum mechanics, phase-space analysis), and mathematics (harmonic analysis, integral transforms, pseudo-differential operators). Gro¨chenig’s book presents a systematic exposition of the foundations of time-frequency analysis, whence

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the title of the present book. The book is written entirely from the mathematician’s point of view on the subject, following the usual conventions and the standards of rigor that accompany every good mathematical textbook. Although it is motivated by applications in signal analysis and quantum mechanics, its main orientation is towards the detailed mathematical investigation of the structures that underline the area of time-frequency analysis. It is not by chance that Gro¨chenig wrote most of this excellent book during his stay at one of the internationally leading research institutes on the area of modern harmonic analysis, namely the Numerical Harmonic Analysis Group (NuHAG) at the Department of Mathematics in the University of Vienna (http://tyche.mat.univie.ac.at/). It is one of only a handful of books that currently exist in the area of time-frequency analysis, and the only one that contains the state-of-the-art mathematical developments on the topic without making itself accessible only to experts. A large amount of important research results on the theory of Gabor analysis and its applications, that is scattered in numerous papers throughout the mathematical literature, can actually be found here for the first time in a compact book form. The central underlying theme of the book is the idea of a joint time-frequency representation for various classes of signals and its unavoidable conflict with the various versions of the well-known uncertainty principle. Emphasis is given on the interdisciplinary aspects of the subject and its connections to other disciplines within and outside mathematics. There are also presented new original results from the theory of Gabor frames and the quantitative measurement of time-frequency signal content through the theory of modulation spaces, as well as from the area of time-frequency analysis of pseudo-differential operators (the author is among the pioneers in these topics). In the first part of the book (chapters 1–8) the author takes the reader from the basic Fourier analysis and fundamental facts concerning the short-time Fourier transform and the uncertainty principle to the foundations of Gabor analysis (Gabor frames, Zak transform, Balian-Low theorem) and non-linear timefrequency signal representations (ambiguity function, Wigner-Ville distribution). This first part of the book contains the core material about time-frequency analysis and uses only Hilbert space techniques and concepts. Chapter 9 is an excursion to the world of the non-commutative Heisenberg group and its representation theory, and it presents some of the concepts of time-frequency analysis from a more abstract (algebraic) point of view. As a reward, the reader will not only gain a deeper insight into the mathematical foundations of time-frequency analysis but he will also learn about new results in Gabor frames. Since wavelet theory is often used as an alternative to time-frequency analysis, Chapter 10 is devoted to comparing the basic structures of these two modern mathematical concepts. The remaining four chapters (Chapters 11–14) are devoted to some of the deeper issues of time-frequency analysis. Their objective is to present from scratch a

more ‘quantitative’ analysis of a joint time-frequency signal representation. For this purpose the author has to depart from the classic L2 Hilbert space theory and he introduces new function spaces – the so-called modulation spaces – in order to re-construct the theory of the short-time Fourier transform and Gabor frames in the context of Banach spaces and operator theory. Readers who are more familiar with wavelet theory, they will be able to identify the similar roles that modulation and Besov spaces play in Gabor and wavelet analysis, respectively. This last part of the book is highly theoretical and requires considerable familiarity from the reader’s side with Banach spaces and distributions theory. This book fills a long lasting gap in the mathematics literature. While time-frequency analysis had benefited from the explosive rise of wavelet theory in the early nineties and the two theories were growing in parallel (see, e.g., Daubechies’s article ‘The wavelet transform, time-frequency localization and signal analysis’, IEEE Transactions on Information Theory, Vol. 36, No. 5, pp. 961–1005, 1990), the book market on wavelets has been sky-rocketing in the last decade whereas no mathematically rigorous introduction to the concepts of time-frequency analysis was readily available. Maybe the impossibility of having orthonormal Gabor bases, imposed by the Balian-Low theorem, was the main reason responsible for this situation. The book should be of great interest to mathematicians, as well as to those applied scientists who want to learn more about the mathematical foundations of this field without having to consult dozens of original papers on the subject. An additional advantage of the book that may be especially appealing to geodesists, and generally to every geoscientist interested on this area, is that Gro¨chenig’s treatment of time-frequency analysis is not restricted to onedimensional signals only but it covers the most general case of m-dimensional Euclidean domains. This is definitely a great mathematical book that will have its influence on the teaching of the subject of time-frequency analysis in the years to come. Christopher Kotsakis University of Calgary/Canada

Fast Bibliography The fast bibliography consists of a listing of papers relevant to Geodesy, that has been collected by the IAG bibliographic service since previous issue of the fast bibliography (JG76/08). The IAG bibliographic service is based on the literary data bank GEOPHOKA, which is maintained by IfAG at the Branch Office Leipzig, Leipzig Zentrale technisch – wissenschaftliche Angelegenheiten, Bibliothek, Karl – Rothe-Strasse 10–14, 04105 Leipzig, Germany. The IAG bibliographic service can be reached at the following Internet address: http://www.leipzig.ifag.de. The bibliographic services are furthermore reachable through the homepage of IAG.

590 Abd-Elmotaal, H. Precise geoid computation using seismic Moho information, Boll. geod. sci. affini, 60(2001)3, pp. 227–238, Firenze, 2001. Agria Torres, J., Hornik, H. Report on the Symposium of the IAG Subcommission for Europe (EUREF) held in Dubrovnik, 16–18 May 2001. Reports of the EUREF Technical Working Group, EUREF Publication; 10, am Main, 2002, Bd. 23, 332 pp. Frankfurt, 2002. Alexander, V. Statistical characteristics of the received signal for stochastic surface models, Geo-spatial inf. sci., 5(2002)1, pp. 22– 27, Wuhan, 2002. Altamimi, Z., Angermann, D., Argus, D., Blewitt, G., Boucher, C., Chao, B., Drewes, H., Eanes, R., Feissel, M., Ferland, R. The terrestrial reference frame and the dynamic Earth, EOS: transactions, 82(2001)25, pp. 273, 278–279, Washington, 2001. Altamini, Z., Boucher, C. The ITRS and ETRS89 relationship: new results from ITRF2000, Mitt. Bundesamtes Kartogr. Geod., am Main, 2002, Bd. 23, pp. 49–52, Frankfurt, 2002. Amod, A., Merry, C. The use of the two-dimensional spherical FFT for quasi-geoid modelling in South Africa, Survey rev., Vol. 36, 2002, No. 285, pp. 508–520, London, 2002. An, R., Wang, H., Feng, X. Research and analysis of technological features of updating and integrating Jiangsu 1:50000 scale fundamental geographic information, Geomatics inf. sci. Wuhan Univ., 27(2002)2, pp. 188–193, Wuhan, 2002. Andres, L. Conversion dans le systeme altimetrique IGN69 de la base de donnees topographiques de la Ville de Nice, XYZ: Rev. Assoc. Franc. Topogr., 24(2002)91, pp. 24–29, Paris, 2002. Antonopoulos, A., Agatza-Bolodimou, A., Paradissis, D. Towards the definition of a new height system of reference of the Hellenic area, Boll. geod. sci. affini, 60(2001)3, pp. 239–256, Firenze, 2001. Antonopoulos, A., Takas, I. Accuracy of first order levelling in Greece, Survey rev., Vol. 36, 2002, No. 285, pp. 544–551, London, 2002. Armand, N., Savorskiy, V., Smirnov, M., Tishchenko, Y. Study of the Earth’s natural resources and environment on the Russian segment of the International Space Station, Mapp. sci. remote sens., 38(2001)3, pp. 191–198, Columbia, 2001. Awange, J. Groebner basis solution of planar resection problem, Survey rev., Vol. 36, 2002, No. 285, pp. 528–543, London, 2002. Bahr, D., Schoettler, F., Schlums, C. Save your breath: GPS drives mobile air quality monitoring, GPS World, 13(2002)5, S. 18–20, 22, 24–25, Oregon, 2002. Barlik, M. Application of the horizontal gravity gradient anomalies in the geoid shape determination, Rep. geod., 2001, Nr. 1(58), pp. 63–76, Warszawa, 2001. Barlik, M. Students’ field training in satellite geodesy and the test– field in Grybow, Rep. geod., 2001, Nr. 1(58), pp. 77–81, Warszawa, 2001. Bathmann, U. The expedition ANTARTIS XVIII/5b of the research vessel ’Polarstern’ in 2001, Ber. Polar- Meeresforsch., 2002, Nr. 407, 98 pp. Bremerhaven, 2002. Baumgartner, M. Satelliten-Erdbeobachtung: Was lernt man ueber die Erde vom Weltraum aus?, Vermess. Photogramm. Kulturtech., 100(2002)6, pp. 359–366, Villmergen, 2002. Belehaki, A., Jakowski, N. Studies of the ionospheric ionization over Athens using ground ionosonde and GPS derived TEC values, Acta geod. geophys. Hung., 37(2002)2–3, pp. 163–170, Budapest, 2002. Bencze, P., Zolesi, B. Papers presented at the 1st Workshop of COST 271 Sopron, 25–27 Sept 2001, Hungary, Acta geod. geophys. Hung., 37(2002)2–3, 379 pp., Budapest, 2002. Berterreche, J. De nombreux avantages identifies en termes de couts st d’execution, Geometre, 145(2002)4, pp. 40–43, Paris, 2002. Bianco, G., Devoti, R., Luceri, V., Sciarretta, C. A review of SLR contributions to geophysics in Eurasia by CGS, Surveys geophys., 22(2991)5–6, pp. 481–490, Dordrecht, 2001.

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