Journal of Geodesy (2001) 74: 672±682

IAG Newsletter Ole Baltazar Andersen IAG Central Bureau, Department of Geophysics, Juliane Maries vej 30, DK-2100 Copenhagen é, 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 ocials 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 In Memoriam Petar Kresimir Colic, the most outstanding member of the Croatian geodetic community, died on 27th May 2000, at the age of 61. He was the full professor at the Faculty of Geodesy, University of Zagreb since 1986, and the full member of the Croatian Academy of Sciences and Arts since 1992. During his long and fruitful scienti®c career, he made a tremendous impact on the developments of modern geodesy in his homeland. His international cooperation allowed the realization of fundamental projects for the future of Croatian geodesy.

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]

Professor Colic was born on 10th July 1938 in Soko Banja, where his father, surveyor as well, participated in land survey of Serbia in former Kingdom of Yugoslavia. After ®nishing the primary and secondary school in Nova Gradiska (Croatia), he studied geodesy in Zagreb. He graduated in 1961 as the ®rst student in his class. During the studies, he was a visiting student in the Vienna cadastre oce for three months. He enrolled the

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postgraduate studies of theoretical mathematics to improve his knowledge about the ®eld so important for his further research. In 1963 he became the university assistant in the ®eld of Higher Geodesy at the Faculty of Civil Engineering and Geodesy of the University of Zagreb. Two years later, he got a grant from German Academic Exchange Service (DAAD) to start the doctorate at the Institute for Theoretical Geodesy in Hannover. He ®nished his Ph.D. thesis in 1971 under the advisorship of Prof. Helmut Wolf. The topic of his thesis titled ``Analytical Downwards Continuation of the Surface Gravity and the Determination of its Components in Tunnels'' represented the basis of his later research work ± the Earth's gravity ®eld. He became the Assistant Professor in 1975 in the ®eld of Physical Geodesy, the Associate Professor in 1980, and the Full Professor in 1986. In December 1992, he was elected for the full member of the Croatian Academy of Sciences and Arts as the ®rst geodesist in the long history of the Academy. It should be stressed that he remained among the youngest members of the Academy. At the Faculty of Geodesy, University of Zagreb, he taught Physical geodesy, Marine geodesy, Geodynamics, and Geodesy in geosciences. He was guest professor in Austria (Graz University of Technology) and in Bosnia and Herzegovina (University of Sarajevo). Thanks to his recommendations, all of his collaborators succeeded in making their doctoral theses at prominent universities abroad. His international connections were excellent and honored by two distinct rewards: in 1990 he got the J. J. Baeyer medal from the Berlin Academy of Sciences through the Potsdam Institute for Physics of the Earth; in 1994 he was elected for the correspondence member of the Austrian Geodetic Commission. With his colleagues and friends Prof. Helmut Moritz and Prof. Hans SuÈnkel from the Graz University of Technology, he organized four successful international scienti®c conferences, the last of them being the International Workshop on Perspectives of Geodesy in South-East Europe, hold in Dubrovnik in May 2000. He was the member or national representative of various commissions within the International Association of Geodesy: Commission V: Earth Tides, Commission VII: Recent Crustal Movements (national Representative), Special Study Group 1-72 Marine Positioning, Special Study Group 5-97 Gravity Anomalies and Geodynamics of Mountain Belts, Commission III: International Gravity Commission, Commission VIII: International Coordination of Space Techniques for Geodesy and Geodynamics, Commission X: Global and Regional Geodetic Networks ± Subcommission for Europe (EUREF). Special Study Group 4-171: Dynamic Isostasy, Special Study Group 5-150: Density distribution within lithosphere. In 1992, he became the vice-president (since March 2000 ± the president) of the Croatian National Committee for Geodesy and Geophysics. He was the ®rst president of the National Council for Remote Sensing and Photo-interpretation. Beside numerous duties at the University, he was the ®rst president of the Croatian Geodetic Society, president of the Croatian Astronom-

ical Society, and the chief editor of the Croatian geodetic magazine ``Geodetski list''. His main research interests include physical geodesy (the surface of the geoid, de¯ections of the vertical, gravity ®eld, Mohorovicc discontinuity), satellite geodesy and geodynamics. He experimented with the new methods in prospecting of oil and gas reserves by the use of combined geodetic, gravimetric and geologic models. In satellite geodesy, he started with Doppler/TRANSIT system in 1970, and he was, beside many other GPSprojects, the leader of the EUREF project for Croatia and Slovenia in 1994. In geodynamics, he was the leader of repeated GPS-campaigns along the eastern Adriatic coast (1994, 1996, and 1998) in order to detect the movements of the Adriatic plate. Both EUREF and CRODYN project were supported by German Federal Agency for Cartography and Geodesy (BKG) due to the excellent co-operation between Professor Coli and the former BKG director Prof. Herman Seeger. In all his activities, including the heroic ®ght with the severe healthy problems, he enjoyed the full support by his wife Dr. Vesna Cvrlje-Colic, physician, and his daughter Ana, physician as well. His students and assistants shall always remember Professor Colic as a remarkable personality and excellent teacher, especially devoted to the team work. He was able to give a fresh impetus to his collaborators in critical moments, when the rest of us was already desperate. It is certain that a large number of Croatian geodesists and surveyors will share the memory of his advice, sense of humor, and always present life optimism he was shinning out wherever he appeared to promote his loved geodesy. Damir Medak, Zagreb Meeting and School Announcements IGeS Geoid School Cairo, Egypt, January 6±11th, 2001 Announcement available on IAG home page (www.gfy. ku.dk/iag) For more information contact Dr. Naser El-Sheimy (IGeS School) Department of Geomatics Engineering, The University of Calgary, 2500 University Dr., N.W., Calgary, Alberta T2N 1N4, Canada, E-mail:., IgeS can be contacted via. http://www.iges.polimi.it/ IAG Scienti®c Assembly Budapest, 3±7 September, 2001 First circular and information is available at http:// www.sztaki.hu/conferences/iag2001 International Symposium on Vertical Reference Systems February 20±23, 2001 Cartagena ± Colombia Information and registration at the Symposium web site: http://codazzi9.igac.gov.co/veres.html or http://www.dg®.badw.de/veres/veres.html Organized by Instituto Geogra®co Agustõ n Codazzi

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European Geophysical Society 26th General Assembly Nice, France 26±30 March 2001 Information and registration at the Symposium web site. http://www.copernicus.org/EGS/EGS.html Book Review

title:

Astrometry of Fundamental Catalogues, The Evolution from Optical to Radio Reference Frames authors: H.G. Walter and O.J. Sovers publisher: Springer Verlag ± Berlin/Heidelberg ISBN: 3-540-67436-5 year: 2000 price: DM 119 pages: 232 If we do agree that the principal task or aim of astrometry is the de®nition and implementation of frames and systems of reference in space, then its ultimate challenge is certainly the establishment of inertial frames and systems. In the past this branch of astronomy was dominated by optical observations whereas now the duality of optical and electronic (microwave) observations prevails. There is no doubt that, at present, spectacular astrophysics is dominating astronomy and the role of astrometry is sometimes underestimated. Therefore, it appears important and appropriate that a book, such as this one, was recently published where the role, the intricacy and the importance of astrometry in view of astrometric catalogues are stressed and described in detail. It is interesting to realize

that the two authors originate from two centers of research of the aforementioned two branches of observations, i.e. the optical as well as electronic or microwave measurements, where the Astronomische Rechen-Institut in Heidelberg has a long tradition in optical catalogues such as FK5 and Jet Propulsion Laboratory in Pasadena is a center of Very Long Baseline Interferometry (VLBI). Such a book was desired since long time and the present compact and, on the other side, very detailed and competent description, analysis and explanation of that basic part of astrometry ®lls a gap in scienti®c literature and ful®ls the needs of a variety of disciplines from geodesy up to fundamental physics. It is, consequently, essential that it was written in a clear and comprehensive style without omitting the inherent diculties which dominate the details of astrometry. In this way the book became a reference book and a text book for students of various disciplines at once. Catalogues of stars, on the one side, and of radiosources, radiostars and quasi-stellar-objects (quasars), on the other side, as well as the links between both types are the fundamental tools for the implementation of reference frames in practice. One of the many advantages of this book is the fact that it is readable for and well understood by nonexperts in the ®eld. So in the ®rst chapter the reader is introduced into the fundamentals and basic facts of astrometry, where optical and radio catalogues are de®ned and described. Moreover, luni-solar precessionnutation are treated and galactic as well as extragalactic measurements for the implementation and the establishment of inertial systems are explained. As a typical example, the Fundamental Catalogue FK5 in its relations to the solar system, time, its historic development, the basic underlying meridian cycle observations and its construction are outlined; followed by the concepts which are described in the second chapter. The role of modern space astrometry is discussed in chapter three where the Hubble-Telescope, Hipparcos and related missions are treated. Whereas the Hubble-Telescope concerns the deep-space orientation, Hipparcos represents the determination of large numbers of stars in relative orientation systems of which the absolute orientation in space deserves special consideration. The role of the Astronomische Rechen-Institut Heidelberg in the data processing of Hipparcos data gives the chance for ®rst-hand information. Similar arguments hold for the FK5. The respective adjustments with rank defects and similar problems, which are well known to and of great interest for geodesists, are discussed in detail by the authors. One of the highlights of the book is radio interferometry as treated in chapter four. Starting from historic developments a detailed description and analysis is given which begins with observations and goes into many details of the reduction, such as aberration and parallaxes. Details of data processing and special adjustment problems have also been treated in the subsequent three chapters. Modern Fundamental Catalogues of extragalactic radio sources, their de®nitions and implementations of coordinate origins and their relations to the equinox

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as well as the di€erent types of observations and their combinations are discussed in detail within chapter ®ve. Of particular interest to the geodesist are also the physical models underlying the large masses of data. In these two chapters basically the foundations of celestial reference frames, such as the ICRF, are explained. The sixth chapter is devoted to the International Celestial Reference System (ICRS) where the many details of the celestial reference frames are pointed out and discussed in a very clear and comprehensible way. Finally chapter seven is devoted to the interrelations of the Hipparcos Catalogue to conventional celestial systems. Of particular interest in that connection are the relations to extragalactic systems and the FK5. Classical methods as well as the use of vectorial spherical harmonics are considered. A further highlight is chapter eight where future missions, such as FAME, SIM and GAIA, and their implications for modern astrometry as well as future prospects, in general, are outlined. The great chances of improved determination of proper motions and of better interrelations between relative and absolute frames of reference, in comparison to the HIPPARCOS catalogue are obvious. The way in which this book has been written is really impressive. A detailed index, a very informative list of reference, a careful preface and a colourful prologue by famed Victor Abalakin contribute to the value of the book as a reference as well as a textbook. A large number of rather complicated details is presented in a very elaborate manner so that also readers from neigh-

bouring disciplines can understand even the intricacies which are quite numerous in modern astrometry. The di€erences between absolute and relative orientation and the problems associated with di€erences between accuracy, precision, internal consistency, reproducibility etc. are carefully elaborated and represented in a competent form. The book really ®lls a gap in modern astronomical literature. The evolution from optical to radio reference frames was seldom so nicely and clearly given in the past. Erwin Groten Darmstadt University of Technology/Germany

Fast Bibliography The fast bibliography consists of a listing of papers relevant to Geod. that has been collected by the IAG bibliographic service since previous issue of the fast bibliography (JG74/07-08). The IAG bibliographic service is based on the literary data bank GEOPHOKA, which is maintained by IfAG at the Branch Oce 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.

Meeting Calendar for 2001 Date

Sponsor

Name of Conference

Location

Info

3±5 Jan

IAG

3rd International Workshop on Mobile Mapping Technology

Cairo, Egypt

e-mail: [email protected]

6±11 Jan 19±21 Feb

IAG IAG

Cairo, Egypt Sopron, Hungary

http://www.acs.ucalgary.ca/cmellum Contact http://www.iges.polimi.it/ Contact http://www.ggki.hu/a/

21±23 Feb

IAG

12±16 March

IAG

26±30 March

EGS

IgeS Geoid School International Winter Seminar on Geodynamics IAG sponsored symposium, Vertical reference systems First Int Symp on Robuts Staistics and Fuzzy Techniques in Geodesy and GIS, EGS ± 26th General, Assembly

Seoul, Korea

10±18 July 2±8 Sept

IAMAS IAG

FIG working week and XXIV General Assembly 8th Sci. Assembly of IAMAS IAG Scienti®c Assembly

18±30 Aug 27 Sept±2 Oct

IAGA

Hanoi, Vietnam Australia

1±3 Oct

IAG

21±28 Oct

IAPSO/IABO

IAGA-IASPEI joint sci Assembly 42nd Australian Surveyors Congress. 2001 Optical 3D measurement techniques 2001 An Ocean odysseey

6±11 May

Cartagena, Colombia Zurich, Switzerland Nice France

Innsbruck, Austria Budapest, Hungary

Vienna, Austria Argentina

Contact: Laura Sanchez, [email protected] Contact http://www.gis.ethz.ch/iag Website http://www.copernicus.org/ EGS/EGS.html Organising Com; fax + 82 335 335 0853; e-mail [email protected] contact [email protected] Contact http://www.sztaki.hu/ conferences/iag2001 Contact: [email protected] Website: http://www.isaust.org.au/ members/confs.html. Website http://info.tuwien.ac.at/ ingeo/optical3d/o3d.htm website http://www.criba.edu.au/ 2001_ocean

676 Abd-Elmotaal, H. Alternative methods for terrain reduction computation, Boll. geod. sci. ani, 59,3, pp. 237±260, Firenze, 2000. Abd-Elmotaal, H. Vening Meinesz inverse isostatic problem with local and global Bouguer anomalies, J. geod., Vol. 74, Nr. 5 = Juli, pp. 390±398, Berlin, 2000. Adam, J., Kenyeres, A., Gazso, M., Virag, G. Az Allami Foeldmeresnel 1969 es 1999 koezoett vegzett geoidmeghatarozasi munkalatok, Geod. kartogr., 52,2, pp. 7±14, Budapest, 2000. Albertella, A., Malinverni, E., Tornatore, V. Missioni di geodesia spaziale per la determinazione del campo gravitazionale terrestre, Boll. geod. sci. ani, 59,1, pp. 97±108, Firenze, 2000. Altiner, Y., Seeger, H., Schlueter, W. EUREF reference frame Veroe€. Akad. Wiss., Astron.-geod. Arb., H. 60, pp. 106±113, Muenchen, 1999. Atkinson, N., Allan, A. Back to basics (18): least squares, statistic and all that, Survey rev., Vol. 35, Nr. 276, pp. 412±417, London, 2000. Atkinson, N., Allan, A. Back to basics (19): least squares, statistics and all that, Survey rev., Vol. 35, No. 277, pp. 499±504, London, 2000. Bao, J., Chao, D., Li, J. Tidal harmonic analysis near crossovers of TOPEX/POSEIDON ground track in South China Sea, Acta geod. cartogr. Sinica, 29,1, pp. 17±23, Beijing, 2000. Becker, J. Hoeydeproblematikk sett med nordiske oeyne, Kart plan, 92,1, pp. 17±22, Oslo, 2000. Beutler, G. Contributions of the International GPS Service for Geodynamics (IGS) to global geodynamics, astronomy and atmosphere science: review and outlook, Acta geod. geophys. Hung., 35,1, pp. 3±24, Budapest, 2000. Bian, S., Menz, J. Two new solution for an inverse problem on the length of the meridian arc, Allg. Vermess.nachr., 107,7, pp. 254± 257, Heidelberg, 2000. Bosse, M., Couto, D., Teller, S. Eyes of Argus: georeferenced imagery in urban environments, GPS World, 11,4, S. 20-26, 28, 30, Oregon, 2000. Boy, J., Hinderer, J., Amalvict, M., Calais, E. On the use of long records of superconducting and absolute gravity observations with special application to the Strasbourg station, France, Cah. Centre Europ. Geodyn. Seism., Vol. 17, pp. 67±83, Luxembourg, 2000. Brugger, D. Integration de systemes satellitaires et inertiels pour la bathymetrie, Vermess. Photogramm. Kulturtech., 98,6, pp. 360± 363, Villmergen, 2000. Bruin, E. Navigeren langs de spoorwegen: programma ATB en Detectie (PAD), Geodesia: T. geod. geo-inform., 42,6, pp. 291± 293, Apeldoorn, 2000. Brunner, F. Zur Praezision von GPS-Messungen, 10 pp. 1999. Bursa, M., Kouba, J., Vatrt, V., Vitek, V., Vojtiskova, M. TOPEX/POSEIDON altimetry and dynamics of the ocean-atmosphere system, Studia geophys. geod., 44,1, pp. 1±12, Praha, 2000. Calais, E. Des nouveaux outils au service de la mesure geophysique, Geometre, 143,3, pp. 39±45, Paris, 2000. Cao, H., Zhu, Z., Yu, J. Poisson gravimetric boundary value problems, J. Wuhan Techn. Univ. Survey. Mapp., 24,1, pp. 45± 49, Wuhan, 1999. Casula, G., Baldi, P., Hinderer, J., Amalvict, M. The gravimetric station of Brasimone: results of an intercomparison experiment between gravimeters, Cah. Centre Europ. Geodyn. Seism., Vol. 17, pp. 137±144, Luxembourg, 2000. Chen, C., Chen, Y., Yeh, T. The impact of GPS antenna phase center o€set and variation on the positioning accuracy, Boll. geod. sci. ani, 59,1, pp. 73±94, Firenze, 2000. Chen, G., Lin, H. The e€ect of temporal aliasing in satellite altimetry, Photogramm. eng. remote sens., 66,5, pp. 639±644, Bethesda, 2000. Chen, J. Permanent tides and geodetic datum, Acta geod. cartogr. Sinica, 29,1, pp. 12±16, Beijing, 2000. Chen, X., Forberg, M., Schenke, H., Pohl, M., Schoene, T., Le Provost, C. Auswertung von Daten der SCAR-GPS-Kampag-

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677 Dietrich, R. Deutsche Beitraege zu GPS-Kampagnen des Scienti®c Committee on Antarctic Research (SCAR) 1995±1998, Dtsch. Geod. Komm., R. B, Nr. 310, 227 pp., Muenchen, 2000. Dietrich, R., Dach, R., Engelhardt, G., Ihde, J., Korth, W., Kutterer, H., Lindner, K., Mayer, M., Menge, F., Miller, H. Ergebnisse der SCAR GPS Kampagnen: ITRF-Koordinaten und Geschwindigkeiten, Dtsch. Geod. Komm., R. B, Nr. 310, pp. 11-20, Muenchen, 2000. Dittfeld, H. Final results of the SG-registration in Potsdam, Cah. Centre Europ. Geodyn. Seism., Vol. 17, pp. 11±24, Luxembourg, 2000. Ducarme, B., Vandercoilden, L. First results of the GGP data bank at ICET, Cah. Centre Europ. Geodyn. Seism., Vol. 17, pp. 117± 124, Luxembourg, 2000. Duckham, M., Drummond, J. Assessment of error in digital vector data using fractal geometry, Int. j. Geogr. Inf. Sci., 14,1, pp. 67± 84, London, 2000. Dufour, H. Transformation des receptions GPS en coordonnees cartographiques, XYZ: Rev. Assoc. Franc. Topogr., 22(222)1,82, pp. 54±56, Paris, 2000. Duquenne, F. La logique de service de la station GPS permanente de l'ESGT au Mans, Geometre, 143,3, pp. 48±49, Paris, 2000. Ehrensperger, W. Relative velocities of IGS-stations within the Mediterranean area computed by GPS measurements, Veroe€. Bayer. Komm. Int. Erdmess. Bayer. Akad. Wiss., Astron.-geod. Arb., H. 60, pp. 228±232, Muenchen, 1999. El Wahabi, A., Dittfeld, H., Simon, Z. Metrological in¯uence on tidal gravimeter drift, Cah. Centre Europ. Geodyn. Seism., Vol. 17, pp. 217±228, Luxembourg, 2000. Engelhardt, G., Gabenski, P., Vassileva, K. Zur Ableitung von Bewegungsparametern im Referenznetz Antarktis: die Loesung des Bundesamtes fuer Kartographie und Geodaesie unter Nutzung der Berner GPS-Auswertesoftware, Dtsch. Geod. Komm., R. B, Nr. 310, pp. 69±76, Muenchen, 2000. Eugen, B. Frequency sharing on L1, Veroe€. Bayer. Komm. Int. Erdmess. Bayer. Akad. Wiss., Astron.-geod. Arb., H. 60, pp. 233, Muenchen, 1999. European Centre of Geodynamics and Seismology (Hrsg.)., Ducarme, B., Barthelemy, J. Proceedings of the workshop: High precision Gravity Measurements with Application of Geodynamics and Second GGP Workshop, March 24th to 26th, 1999, Munsbach Castle (Grand-Duchy of Luxemburg), Cah. Centre Europ. Geodyn. Seism., Vol. 17, 248 pp. Luxembourg, 2000. Even-Tzur, G. Datum de®nition for GPS networks, Survey rev., Vol. 35, No. 277, pp. 475±486, London, 2000. Fashir, H., Kadir, A., Abu, S. Progress towards examination of datum transformation parameters in Peninsular Malaysia, South African j. survey. geo-inf., 1(April,)4, pp. 191±204, Marshalltown, 2000. Favey, E., Wirth, B., Geiger, A. Mit Satellitenvermessung an Loipen auf der Spur, Vermess. Photogramm. Kulturtech., 98,6, pp. 383±385, Villmergen, 2000. Featherstone, W., Vanicek, P. The role of coordinate systems, coordinates and height in horizontal datum transformations, Aust. surveyor, 44,2, pp. 143±150, Sydney, 1999. Ferhat, G. Japon: surveillance tectonique par GPS, XYZ: Rev. Assoc. Franc. Topogr., 22(222)1,82, pp. 76. 78±80, Paris, 2000. Ferraro, C., Nardi, A., Pacione, R., Sciarretta, C., Vespe, F. The network of GPS permanent stations in Italy: data analysis activities at Matera Space Geodesy Center (CGS) ± prospects, Veroe€. Bayer. Komm. Int. Erdmess. Bayer. Akad. Wiss., Astron.-geod. Arb., H. 60, pp. 234±236, Muenchen, 1999. Forberg, M., Pohl, M., Schenke, H., Schoene, T. GPS und Pegelmessungen in der Antarktis: ein Beitrag zum einheitlichen Hoehendatum, Dtsch. Geod. Komm., R. B, Nr. 310, pp. 207± 210, Muenchen, 2000. Forssell, B. GALILEO ± det framtidige satellittnavigasjonssystement?, Kart plan, 92,1, pp. 33±38, Oslo, 2000. Forssell, B. Stoey i en GPS mottaker, paavirkning fra andre signalkilder, Kart plan, 92,1, pp. 29±32, Oslo, 2000.

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