Journal of Geodesy (1998) 72: 557±560

IAG Newsletter O. B. 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: · · · ·

general information reports of IAG symposia reports by national correspondents reports by commissions, special commissions or study groups · symposia announcements · book reviews · fast bibliography

General Information New chairman of SSG 2.162 ± Precise Orbits Using Multiple Space Techniques The EC has unanimously voted yes for the replacement of Dr. A. Marshall (USA) as president of SSG 2.162 by Mr. Remko Scharroo, Delft University of Technology, 2629 HS Delft, The Netherlands. e-mail: [email protected], Tel.: +31 15 2781483, Fax: +31 15 2785322. Books for review are the responsibility of: Prof. Martin Vermeer Finnish Geodetic Institute Geodeetinrinne 2, (PL 15) SF-02431 Masala Finland e-mail: Martin.Vermeer@fgi.®

Meeting Announcements IUGG99, 18±30 July 1999, Birmingham Second circular and call for abstracts are now available. IUGG99 has a web site established at http:/www.bham.ac.uk/IUGG99/. It is regularly updated. Here you can ®nd out more about IUGG and its associations, about IUGG99, about Birmingham and the university. The Ninth International Symposium on Recent Crustal Movements, CRCM '98 Cairo, Egypt, 14±19 November 1998 Second circular is available from Dr. Salah Mahmoud, NRIAG, Cairo ([email protected]) The International Symposium on GPS, Application to Earth Sciences and Interaction with Other Space Geodetic Techniques (GPS99 in Tsukuba) 18Ð22 October 1998, Tsukuba, Ibaraki, Japan More info: http://wwwsoc.nacsis.ac.jp/geod-soc/gpssymp/ Scope: The symposium will consider the recent increase in GPS applications to Earth Sciences. The Local Organizing Committee cordially invite all of those who are interested in the following subjects: Crustal deformations by dense GPS arrays in southern California, Japan, etc. Ground- and space-based GPS meteorology Investigation of the ionosphere Application to earth rotation studies; geocenter and reference frame, etc. Combination of SLR and GPS Integrated space geodetic network using VLBI, GPS, GLONASS, etc.

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GPS and other techniques such as SAR, gravity measurements, etc. Crustal dynamics in eastern Asia and the Western Paci®c, and their numerical modelling Physical process at the plate boundary; slow earthquakes, superplume, backarc spreading, etc. Kinematic GPS for monitoring seismic waves, tsunamis, ice ¯ow, sea bottom displacements, etc. Local array for volcano and earthquake monitoring and hazard reduction Application of GPS for monitoring sea-level change Collaborations between international projects: WING, APSG, GEODESSIA, etc. Regional aspects and roles of the International GPS Service (IGS) New and future space technologies and combination with conventional space techniques Tutorial sessions for those who are beginning GPS researches, etc. Polar motion: historical and scientic problems IAU Colloquium 178 Cagliari University Center, Sardinia, Italy, 27±30 September 1999 A First Circular and Call for Papers will be mailed to interested persons in November, and a web site will be made available soon giving more speci®c information. At the present time requests for more information can be addressed to the Chairman of the Scienti®c Organizing Committee, Dr. Steven Dick at [email protected] Scienti®c Program The Colloquium will include the following topics: · · · · · · · · ·

History of early polar motion research History of the monitoring service organizations Evolution of astronomical observations Mechanisms for excitation of polar motion Secular polar motion Chandler motion Daily and subdaily polar motion Modern de®nition of the celestial ephemeris pole Outstanding problems in polar motion research

Invited, contributed and poster papers will be considered. The collected proceedings will be published. The Colloquium is sponsored by IAU Commission 41 (History of Astronomy) with support from Commissions 19 (Earth Rotation) and 31 (Time). It is cosponsored by the International Association of Geodesy and the International Earth Rotation Service. Book review Due to some unfortunate printing errors the following review appearing in JG72/6 is repeated. Di Francesco P, Mathieu P and SeÂneÂchal D (1997), Conformal Field Theory Springer Verlag, Berlin Heidelberg New York, ISBN 0±387±94785-X, 890 pp

The monograph is the ®rst extensive textbook on conformal ®eld theory with applications in string theory, statistical physics and condensed matter physics. The authors have announced a second volume that will deal with super-conformal ®eld theory, parafermionic models and W-algebra, in particular quantum theory. The text is divided into three parts: Part A (92 pages) presents an Introduction, Part B (395 pages) reviews the Fundamentals and, ®nally, Part C (374 pages) reviews conformal ®eld theory with Lie Group Symmetry. Moreover, for general interest in conformal ®eld theory, geodesists will ®nd chapters 2.4 on symmetries and conservation laws and 4.1 on the conformal group (similarity transformation, S-transformation) most interesting. In chapter 2.4, the authors emphasize the importance of symmetry in physics as a whole. Their book is mainly an analysis of consequences of scale invariance for twodimensional systems. Consider a collection of ®elds collectively called F. The action functional will depend in general on F and its ®rst derivative, ¶lF, namely S=ò ddxL(F,¶lF). The e€ect on the action functional of a transformation x ® x', F(x) ® F'(x')= F(F(x)), affecting both the position and the ®eld, is studied. For such active transformations, namely their in®nitesimal counterparts, generators are given, the E. Noether Theorem is formulated. Chapter 4.1 focuses on a special active transformation, the conformal group which leaves harmonic ratios or cross-ratios of four distinct points, namely |x1±x2| |x3±x2|/(|x1±x3| |x2±x4|) invariant. It is shown that the conformal transformation group contains four constituents, namely (i) the translation, (ii) the dilation (scale), (iii) the rigid rotation and (iv) the special conformal transformation SCT. SCT is manifestly nothing but a translation, preceded and followed by an inversion. Such a transformation, namely C10(3), the 10-parameter conformal group in a three dimensional Euclidean space, has been used by E. Grafarend and G. Kampmann (Zeitschrift fuÈr Vermessungswesen 121, 1996, 68±77) as a datum transformation of three dimensional geodetic networks. Here, its generators as well as its commutation rules are given. In chapter 4.2, conformal invariance in classic ®eld theory is outlined. Chapter 5 discusses conformal invariance in two dimensions. The Cauchy±Riemann (d'Alembert-Euler) equations for holomorphic functions, global conformal transformation (P(z)/Q(z)), conformal generators and the famous Ward identities are reviewed. The book o€ers great insight into conformal ®eld theory, regarding in particular a physical geodesist who is familiar with Gauss-Krueger-, UTM- or UPS-conformal mapping. The 'datum problem' of the gravity ®eld, e.g., is given a new fundament. From this point of view, the book can only be highly recommended to all geodesists! Erik W. Grafarend

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Fast Bibliography The fast bibliography consists of a listing of papers relevant to geodesy that has been collected by the IAG bibliographic service since the previous issue of the fast bibliography (JG72/6). 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 This version of the fast bibliography has been supplemented with papers registered by A Tables of Content in Geodesy provided by M&M Craymer and with papers registered by the American Congress on Surveying and Mapping (ACSM) bibliographic service. The IAG bibliographic service can be reached at the following Internet address: http://www.leipzig.ifag.de. Furthermore, bibliographic services are available through the homepage of IAG. Afraimovich, E., Palamartchouk, K., Perevalova, N. GPS direct and inverse radiointerferometry : new methods of investigating travelling ionospheric disturbances, Acta geod. geophys. Hung., 32(1997)3±4, pp 469±479, Budapest, 1997. Arnaud, M., Flori, A. Bias and precision of di€erent sampling methods for GPS positions, Photogramm. eng. remote sens., 64(1998)5, pp 597±600, Bethesda, 1998. Bencze, P., Maercz, F., Szendroei, J. Di€erence between the length of the true propagation path and the geometrical path of radio waves transmitted by GPS satellites, Acta geod. geophys. Hung., 32(1997)3±4, pp 417±425, Budapest, 1997. Bencze, P., Szendroei, J., Kovacs, K. Modelling of the propagation of radio waves transmitted by GPS satellites in an ionosphere with irregularities, Acta geod. geophys. Hung., 32(1997)3±4, pp 427±437, Budapest, 1997. Booker, J., Aprea, C., Unsworth, M., Wu, N. Electrical conductivity structure in major continental tectonic zones, Geowissenschaften, 15(1997)3±4, pp 111±115, Berlin, 1997. Borkowski, A., Burghardt, D., Meier, S. Zur optimalen Approximation von Hoehenpro®len, Oesterr. Z. Vermess. Geoinf., 85(1997)4, pp 281±285, Wien, 1997. Bucksch, H. Dictionary Geotechnical Engineering = Woerterbuch GeoTechnik : Bd. 1. Englisch-Deutsch, Rep. geod. : Springer, 1997, 688 pp, Berlin, 1997. Caspary, W., Wang, J. Redundanzanteile und Varianzkomponenten im Kalman Filter, Z. Vermess.wes., 123(1998)4, pp 121±128, Stuttgart, 1998. Cioanca, N. Absolute and relative gravity measurements in Romania performed in cooperation with NIMA, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 89±96, Bucharest, 1997. Collier, P., Argeseanu, V., Leahy, F. Distortion modelling and the transition to GDA94, Aust. surveyor, 43(1998)1, pp 29±40, Canberra, 1998. Dong, D., Herring, T., King, R. Estimating regional deformation from a combination of space and terrestrial geodetic data, J. geod., Vol. 72, No. 4, 1998, pp 200±214, Berlin, 1998. Fotion, A. A pair of closed expressions to transform geocentric to geodetic coordinates, Z. Vermess.wes., 123(1998)4, pp 133±135, Stuttgart, 1998. Freeden, W., Schneider, F. An integrated wavelet concept of physical geodesy, J. geod., Vol. 72, No. 5 = Mai 1998, pp 259± 281, Berlin, 1998. Gabor, E. The conception and stage of geoid determination for the territory of romania, Partnership in mapping, charting and

geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 97±99, Bucharest, 1997. Gandu, T. The military GPS network, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 85± 88, Bucharest, 1997. Gargiulo, R., Vasallo, A. The spatial solution of the ®rst fundamental geodetic problem, Survey rev., Vol. 34, 1994, No. 268, pp 405±412, London, 1998. Gilbert, C. Evolution of GPS data collection for GIS, EOM : mag. geogr., mapp., Earth inf., 7(1998)2, pp 27±28, Aurora, 1998. Glatzmaier, G., Roberts, P. Computer simulations of Earth's magnetic ®eld, Geowissenschaften, 15(1997)3±4, pp 95±99, Berlin, 1997. Grafarend, E., Sy€us, R. The optimal Mercator projection and the optimal polycylindric projection of conformal type : case-study Indonesia, J. geod., Vol. 72, No. 5, 1998, pp 251±258, Berlin, 1998. Grafarend, E., Sy€us, R. The solution of the Korn-Lichtenstein equations of conformal mapping : the direct generation of ellipsoidal Gauss-Krueger conformal coordinates or the Transverse Mercator Projection, J. geod., Vol. 72, No. 5, 1998, pp 282±293, Berlin, 1998. Grafarend, E., Sy€us, R. Transformation of conformal coordinates of type Gauss-Krueger or UTM from a local datum (regional, National, European) to a global datum (WGS 84). Part I : the transformation equations, Allg. Vermess.nachr., 105(1998)4, pp 134±141, Heidelberg, 1998. Gross, R., Eubanks, T., Steppe, J., Freedman, A., Dickey, J., Runge, T.A Kalman-®lter-based approach to combining independent Earth-orientation series, J. geod., Vol. 72, No. 4, 1998, pp 215±235, Berlin, 1998. Hwang, C. Inverse Vening Meinesz formula and de¯ection-geoid formula : applications to the predictions of gravity and geoid over the South China Sea, J. geod., Vol. 72, No. 5, 1998, pp 304±312, Berlin, 1998. Jia, M., Montgomery, B., Ding, X. On reliability measures for kinematic surveys, Geomatica, 52(1998)1, pp 37±44, Ottawa, 1998. Jonkman, N., Delft University of Technology (Hrsg.). Integer GPS-ambiguity estimation without the receiver-satelite geometry, Allg. Vermess.nachr., 1998, 95 pp : Abb., Tab., Delft, 1998. Kabelac, J. SLR ± determination of re¯ection time, Oesterr. Z. Vermess. Geoinf., 85(1997)4, pp 288±289, Wien, 1997. Kind, R., Bock, G., Estabrook, C., Gossler, J., Hanka, W., Mechie, J., Wylegalla, K., Yuan, X. The new generation of seismological networks : a high-resolution tool for earthquake studies, Geowissenschaften, 15(1997)3±4, pp 105±110, Berlin, 1997. Klukas, R., Lachapelle, G., Fattouche, M. Cellular telephone positioning using GPS time synchronization, GPS World, 9(1998)4, pp 49±54, Oregon, 1998. Koler, B. Heights, potentials and geopotential numbers, Geod. vestnik, 42(1998)1, pp 7±12; 13±19, Ljubljana, 1998. Kosek, W., McCarthy, D., Luzum, B. Possible improvement of Earth orientation forecast using autocovariance prediction procedures, J. geod., Vol. 72, No. 4, 1998, pp 189±199, Berlin, 1998. Kraus, K. Interpolation nach kleinsten Quadraten versus KrigeSchaetzer, Oesterr. Z. Vermess. Geoinf., 86(1998)1, pp 45±48, Wien, 1998. Langel, R. Geomagnetism from space : accomplishments and prospects, Geowissenschaften, 15(1997)3±4, pp 90±94, Berlin, 1997. Lesea, A., Gross, B. Making connections : in sync with telecommunications, GPS World, 9(1998)4, pp 38±42, Oregon, 1998. Liu, L., Hsu, H., Gao, B. A new family of orthonormal wavelet bases, J. geod., Vol. 72, No. 5 = Mai 1998, pp 294±303, Berlin, 1998.

560 Luzum, B., McCarthy, D., Kosek, W. New prediction algorithm for polar motion, J. geod., Vol. 72, No. 4 = April 1998, pp 245± 247 (IAG Newsletter), Berlin, 1998. Marceau, G., Morse, B., Bouchard, G., Santerre, R., Parrot, D., Roy, E. Application du GPS et l'approche On-The-Fly en temps reel pour les releves bathymetriques, J. geod., 6 pp, 1996, 1996. Merry, C., Whittal, J. Transformation of co-ordinate data for the new South African Datum : a pilot study, Survey rev., Vol. 34, 1994, No. 268, pp 379±388, London, 1998. Michelsen, M. New technology gives runners wings : applications for GPS/Modeling software are boundless, EOM : mag. geogr., mapp., Earth inf., 7(1998)2, pp 22±24, Aurora, 1998. Mugnier, C. Coordinate systems and surveying customs in Louisiana, Photogramm. eng. remote sens., 64(1998)5, pp 579± 580, Bethesda, 1998. Okeke, F. The curvilinear datum transformation model, Acta geod. geophys. Hung., 1998, 138 pp : 30 Abb., 64 Tab., 6 Anh., zahlr. Lit., Muenchen, 1998. Pantelis, M. Elements of valuation of geomagnetic stations using linear models, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 25±35, Bucharest, 1997. Reinhart, E., Becker, M. National report of Germany April 1997 October 1997, Rep. geod., 1997, No. 7(30), pp 29±33, Warszawa, 1997. Reinhart, E., Rus, T., Becker, M., Neumaier, P., Seeger, H. Data evaluation of the CEGRN-97 GPS campaign at BKG Processing Centre, Rep. geod., 1997, No. 7(30), pp 81±92, Warszawa, 1997. Reit, B. The 7-parameter transformation to a horizontal geodetic datum, Survey rev., Vol. 34, 1994, No. 268, pp 400±404, London, 1998. Sarchis, P., Cioanca, N. The conception of GPS technologies use in topogeodetic support of Romanian Army, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 101±102, Bucharest, 1997. Scholz, C. Earthquake and fault populations and the calculation of brittle strain, Geowissenschaften, 15(1997)3±4, pp 124±130, Berlin, 1997. Schwintzer, P. Earth gravity ®eld recovery from satellite orbit perturbations, Geowissenschaften, 15(1997)3±4, pp 85±89, Berlin, 1997. Serediuc, C., Carole, I. Finite element in the gravitational ®eld of the Earth, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3± 4 September 1997, 1997, pp 67±71, Bucharest, 1997. Serediuc, C., Carole, I. The solution of numerical global model for the disturbing potential with ®nite elements, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 73±78, Bucharest, 1997.

Serediuc, C., Carole, I. The stochastic model to obtain the relative or absolute coordinates from terrestrial and GPS data, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 55±58, Bucharest, 1997. Serediuc, C., Carole, I. The weighted errors method and the Earth disturbing potential, Partnership in mapping, charting and geodesy '97 : papers for the 4th common conference; Bucharest, Romania, 3±4 September 1997, 1997, pp 59±65, Bucharest, 1997. Sjoeberg, L. A new method for GPS phase base ambiguity resolution by combined phase and code observables, Survey rev., Vol. 34, 1994, No. 268, pp 363±372, London, 1998. Skalski, H. Global Positioning System ± yesterday, today, and tomorrow, Rep. geod., 1997, No. 7(30), pp 139±182, Warszawa, 1997. Sledzinski, J. Proceedings of the 8th CEI CERGOP Working Conference, Warsaw, Poland, 17±18 November 1997, Geod. kartogr. obzor, 1997, 208 pp, Warszawa, 1997. Spaeth, H. Lineare Regression bei Winkelmessdaten, Allg. Vermess.nachr., 105(1998)5, pp 166±167, Heidelberg, 1998. Spaeth, H. Messdatenanpassung mit Ellipsen in allgemeiner Lage und mit vorgegebenem Achsenverhaeltnis, Oesterr. Z. Vermess. Geoinf., 85(1997)4, pp 286±288, Wien, 1997. Stewart, M. How accurate is the Australian National GPS Network as a framework for GPS heighting?, Aust. surveyor, 43(1998)1, pp 53±61, Canberra, 1998. Takac, F., Gerdan, G., Lemmon, T., Hailes, T. A new civilian GPS frequency : What can surveyors expect?, Aust. surveyor, 43(1998)1, pp 41±46, Canberra, 1998. Taylor, G. Crime in the spotlight : GPS patrols Calgary's skies, GPS World, 9(1998)4, S. 26±33, Oregon, 1998. Teunissen, P. Minimal detectable biases of GPS data, J. geod., Vol. 72, No. 4 = April 1998, pp 236±244, Berlin, 1998. Vinnik, L. Seismic anisotropy and mantle ¯ow, Geowissenschaften, 15(1997)3±4, pp 100±104, Berlin, 1997. Volk, M., Kolem, R. Moeglichkeiten bei der Berechnung eines Gletscherinventars mittels GIS und digitaler Bildverarbeitung am Beispiel des Liefde- und Bockfjordgebietes, NW-Spitzbergen (Svalbard), Photogramm. Fernerkund. Geoinf., 2(1998)1, pp 27±40, Stuttgart, 1998. Wanninger, L., Boehme, J. Verwendung virtueller Referenzstationen in regionalen GPS-Netzen, Allg. Vermess.nachr., 105(1998)4, pp 113±118, Heidelberg, 1998. Wriedt, H. GPS steht vor Generalueberholung : nationale Konferenz des Institute of Navigation, GeoBIT, 3(1998)2, pp 34±35, Heidelberg, 1998. Yang, C., Anderson, G., Everitt, J. A view from above : characterizing plant growth with aerial videography, GPS World, 9(1998)4, pp 34±37, Oregon, 1998. Zoback, M., Zoback, M. Crustal stress and intraplate deformation, Geowissenschaften, 15(1997)3±4, pp 116±123, Berlin, 1997.