Bulletin G od sique

Bulletin G6od6sique (1992) 66:365-370

© Springer-Vertag1992

IAG Newsletter Pascal Willis IAG Central Bureau, 2, Avenue Pasteur, BP 68, 94160 Saint-Mand~, France

This part of the Bulletin Gdoddsique is under the editorial responsibility of the IAG Central Bureau chaired by the IAG General Secretary.

Informations

It will include, in each issue, several topics :

The Geodesist's Handbook has been published as the BG 66-2 issue.

• Informations. • Reports of IAG symposia, • Symposia announcements. • Book reviews. • Fast bibliography. It is the intent of the IAG to extend the services provided by its Central Bureau. An up-to-date information medium is one of the key elements. The IAG Newsletter, included as appendix of the Bulletin Gdoddsique, should play this role, and therefore Considered as an open tbrum. Contributors are welcomed to send any information or document which may be of interest for this purpose. This should complement the informations already sent by the IAG officials or the lAG symposia organizers (reports and anouncements). Books to be reviewed arc under the responsability of : Prof. Gunther W. HEIN Institude of Astronomical and Physical Geodesy University FAF Munich Wemer - Heisenberg - Weg 39 W - 8014 Newbiberg - FRG

Any correction should be sent to the Central Bureau• We plan to update the directory of IAG people and to publish it independently. We are also considering to store general informations on a computer file which could be accessed by various means. Any imput from interested people is welcomed.

Reports of lAG Symposia "International Workshop on Global Positioning Systems in Geosciences", Honouring Prof. G e o r g e s V e i s The Technical University of Crete. Chania, Crete, June 8-10, 1992. The International Workshop on Global Positioning Systems in Geosciences was held in Chania, Crete, Greece, on June 8-10, 1992. This International Workshop was organized by the Division of Exploration and Positioning, Department of Mineral Resources Engineering, the Technical University of Crete• It was co-sponsored by the following organizations: International Association of Geodesy, Fdd6ration Internationale des G6om~tres, European Space Agency, Commission of the European Communities, Technical University of Crete, Goulandris Natural History Museum, North Aegean Petroleum Company, Public Power Corporation, Shell (Hellas) Ltd., Hellenic Navy, British Council, Greek

366 Public Estate Corporation, City of Chania, General Secretariat of Rese~ch and Technology, Minoan Lines, ANEK Lines, Hellenic Mapping and Cadastral Organization, INFOTOP Ltd., G. Economides Company, Flour Mills of Crete, S.A., Association of Professional Surveying Engineers. The Technical University of Crete hosted the meeting in the facilities of the Mediterranean Agronomic Institute of Chania, Greece. Dr. Stelios P. Mertikas of the Technical University of Crete was the Workshop Chairman. The meeting was intended to honour Professor George Veis of the National Technical University of Athens, for his contributions to Geodetic Sciences. It was mainly organized by his old students. Thirty five years ago, in 1957, we saw the emergence of the satellite era both in practice, with the lauch of Sputnik I, and in theory, as it was also that year George Veis started his doctorate on "Geodetic Applications of Observations of the Moon, Artificial Satellites and Rockets". His thesis was the conception of the idea of three dimensional positioning not by stars and ground beacons but by earth orbiting satellites. This revolutionary inspiration of Professor Veis opened new horizons and transformed the realm of positioning to such an extent that in the last thirty five years we have seen a vast expansion in the shelr breadth of applications and disciplines in the field of Geosciences where positioning is required. This Workshop was held to honour the justly entitled "founding father" of satellite positioning for his contribution to geodetic sciences. The meeting started with the opening session where introductory remarks and welcoming speeches were given by the Workshop Chairman, by Mr. G. Tzanakakis (Mayor of Chania), by Professor John Tegopoulos (President of the Technical University of Crete), by Professor D. Balodimos (Hellenic National Committee on Geodesy and Geophysics), and by Professor H. Billiris (Chairman of the Department of Rural and Surveying Engineering, National Technical University of Athens). Finally, the meeting was opened by Professor P. Theocharis (Secretary-General of Athens Academy). The keynote address was given by the past-president of IAG, Professor Ivan I. Mueller. The title of his presentation was "35 years of Satellite Geodesy: 19571992". This presentation was followed by a welcome address given by the honoured person, Professor George Veis. More than ninety participants from Germany, Canada, the United States, France, Greece, haly, the Netherlands, Switzerland, United Kingdom, People's Republic of China, South Africa, Poland and Austria made this workshop an International event. During the workshop, two more special Workshops on the "Mediterranean Sea, Environment and Geosciences" (convener: Prof. B.A, Ainbrosius,

Delft University of Technology) and on the "lAG International GPS Services" (convener: Dr. W G. Melbourne, Jet Propulsion Laboratory, USA) permitted participants to examine and address specific topipcs for further discussion and for setting new directions. Also, a commercial exhibition took place simultaneously at the Workshop site. About thirty paper presentations were divided into five sessions and addressed salient aspects of the Workshop theme:

1. Global Positioning Systems: Status, Policy, Plans. The modelling of free satellite networks in spacetime, (Erik W. Grafarend); Global Positioning System: An overview of present capabilities, current trends and future prospects, (D. Delikaraoglou); A Global refernce frame for geodynamics from GPS, SLR and VLBI, (E.C. Pavlis et al.); First experience with the Soviet ASN-16 GLONASS Receiver, (W. Lechner); Contributions of IAG to Geodynamical Investigations in the Eastern Mediterranean, (Hermann Seeger); The DORIS system and its impact on geodesy and geodynamics, (C. Boucher). 2. Land applications. GPS activities for geosciences in Greece, (H. Billiris et al.); Aegean Geodynamics from satellite laser positioning, (P.J. Dunn et al.); Comparison on global SLR and VLBI solutions (Hermann Drewes); Crustal deformation monitoring in the Alpine system and the central Mediterranean sea using GPS (H.G. Kahle, et al.); Crustal Motions in Greece determined from GPS and SLR observations, (B.A.C. Ambrosius et al); Results from GPS campaigns in the Calabrian arc project (S. Zerbini, et al.); Greek deformation reconstructed from seismic and GPS observations (A. Curtis, et al.); 3. Techniques and applications. Precise real time differential applications of global navigation satellite systems: Present status and future developments, (W. Leehner); A GPS Phase Date Analysis Techniques for Crustal Motion Monitoring, (D. Lelgemann); Applications of GPS short duration observation techniques to local methods, (E. Groten); Velocity fields for the Aegean from GPS strain measurements and earthquake mechanisms, (P. England); Evaluation and modelling of GPS errors in integrated deformation surveys: Case Studies, (A. Chrzanowski); Use of GPS in monitoring ground subsidence due to oil eploitation in Western Venezuela oil fields, (J. Leal et al., presented by A. Chrzanowski); 4. Marine applications. GPS techniques for precise real-time offshore positioning, (P.A. Cross); Offshore positioning of rigs and of geophysical research vessels, (L. Portokalakis);

367 Real time DGPS - a strong tool for positioning demands, (Herbert D011er). 5. Airborne applications. Airborne gravimetry and gravity gradiometry for geophysical prospecting, (M.G. Sideris, et al); The role of the on-board GPS receiver in the ARISTOTELES gravity field satellite mission, (Maurice S. Schuyer, et al.); Airborne Kinematic applications of the Global Positioning System using multiple monitor stations (D. Delikaraoglou); Precise differential GPS navigation for long-range airborne geophysical measurements, (O.L. Colombo); Algorithms and results of kinematic GPS positioning (Y. Georgiadou, presented by D. Delikaraoglou); The Applications of space-borne GPS to atmospheric limb sounding and global change monitoring, (William G. Melbourne). The following resolutions were agreed on by all workshop participants: RESOLUTION 1: The Workshop participants, recognizing that precise positioning alone is insufficient to provide insight in the complex structure of the crust and the lithosphere and the mechanisms behind their evolution, and that accurate separation of geoidal and oceanographic signals over the Mediterranean Sea is required for global climate change studies, recommend: a) The extension of tidal gauge momtoring networks, preferably via continuous-tracking GPS observations; h) the extensive use of altimetric data sets as of ERS-I, and in the future, TOPEX/POSEIDON, to determine accurate dynamic models of the Sea Surface Topography and its periodic variations; and c) the unconditional support of missions designed to determined high resolution, -high-accuracy geoidal models of global extent, and m pamcular the ESA/NASA ARISTOTELES mission. RESOLUTION 2: The Panel on " M e d i l e r r a n e a n Sea, Environment and Geosciences" recogmzes that a framework for monitoring; studying, and modelling the comples geodynamlc, oceanographic, ecologic processes taking place in the Mediterranean area, recommends that, through coordinated efforts of all European countries, a nuinber of collocated data collection systems be established throughout the continent, and in the periphery of the Mediterranean Sea in particular, comprising instruments of use to various disciplines, a) to produce spatially and temporally in situ data sets readily available for assimilation in general modelS; b) to reduce the cost of gathering, transmitting and sorting/archiving data by sharing networks and data bank facilities;

c) to make possible the realization of a network of "total stations" throughout the area so that all scientific disciplines can benefit from this information; d) to aid large scale studies of interdisciplinary nature which are impossible to execute within one science group alone; and e) to foster and encourage discussion and cooperation between diverse scientific disciplines for the achievement of broader goals encompassing those of the individual disciplines.

RESOLUTION 3: The organizing committee of the International V/orkshop on the Global Positioning Systems in Geosciences, honouring Prof. George Veis, has decided to donate the amount of 100,00 Greek Drachmae to the International Association of Geodesy (IAG). This amout is to be awarded as a prize to the author(s) of the best paper published in IAG's official publication journam, Bulletin G6od6sique. The papers to be considered shall be submitted during the period of January 1 - December 31, 1993, The organizing committee leaves the responsibility of establishing the selection procedure to the IAG. Its secretary general, Dr. C. Boucher, has already agreed to this. Furthermore to include other geodetic papers covering theoretical and applications/results topics, we recommend that the IAG-established selection committee considers also the papers submitted to the Manuseripta Geodaetica journal The proceedings of the International Workshop on Global Positioning System in Geosciences will be published. Reference of the proceedings is: Stelios P. Mertikas, Division of Exploration and Positioning, Department of Mineral Resources Engineering, The Technical University of Crete, GR-73100, Chania, Crete, Greece Telephone: 3-0821-64864 Fax: 3-0821-53571 Electronic mail: [email protected],GR. Stelios Mertikas August, 1992,

Book revieW nofmann-Welienhof B., Lichtenegger H. and Collins j, : Global Positioning System, Theory and Practice, 1992, 35 figures, XXi,, 326 pp., Springer-veriag wien New York. Writing a book in such an expanding field like GPS where theory, hardware and software developments especially those of differential GPS - is still in flow, is not an easy task. That one can nevertheless succeed in

368 presenting a well-written book prove the authors with this new soft cover edition. Main key for that was the wise decision to concentrate on those basics which (probably) will maintain their importance over the next years. In thirteen chapters a "classroom text at the senior or graduate level" so the main author in his foreword, is presented. There is no doubt that the book is mainly addressed to surveyors. After some historical notes in the introduction an overview of the GPS system is given. Reference coordinate and time systems as well as related transformations follow. In a brief and compressed form chapters on satellite orbits, satellite signal structure and observables are presented. Here one can found in 6.1.2. the term "phase pseudoranges". To the knowledge of the reviewer this is not a used technical term in GPS. However, one can see what the author(s) meant by that. It is the chapter on carrier phases. Assuming that the integer ambiguity is known and multiplying the carrier phase by the wavelength one ends up with a range to the satellite. The seventh chapter deals with the practical application of GPS in surveying, most aspects fi'om the point of view of the situation in the U.S.A. Mathematical models for single and relative positioning are described on 19 pages (only?l) whereas data processing and transformation of GPS results cover ahnost four times of that space in the book. In the chapter on software modules it seems that the partitioning into so many sub-chapters - some of them only consisting of one sentence - causes more confusion than structure the whole. The last two chapters are devoted to the application of GPS in various fields and the future of it. Clearly, following the principle of writing not too much of trends still not yet completely figured out and settled, only some headlines could be pointed out, like for example, the combination with inertial navigation systems, navigational aspects, or the Russian satellite system GLONASS. Attitude control is not outlined in the book. The typewriting is excellent and the figures are well-drawn. Also the subject index is of good assistence. In conclusion, this is a book on basics of GPS for surveyors (unfortunately not expressed in the title). It is written from a classical GPS surveying point of view not yet following the line to consider it as a special form of GPS differential navigation. No doubt, that also surveying will be in some years nothing else as high-precision real-time kinematic differential positioning. However, this is (up till now) more a question of philosophy how to treat GPS surveying completely separate from Navigation or not. The book can be highly recommended to students in surveying and all who want to have a look to basics of GPS in compressed form. Its structure is built up logically and thus, underlines the value of the book in

contrast to some others one can find on the GPS market.

Gtinter W. Hein, Neubiberg

Fast Bibliography Here are listed the bibliographic items received by the Central Bureau, the Editor in Chief, or the Dresden Center which is also charge of the full and comprehensive publication of the International Geodetic Bibliography. These pages will be included in each issue of the Bulletin Geod6sique, presenting in a fast way the new information collected since the previous number nominally three months. Two parts contains respectively the books, reports, proceeding or else received (part A) and the geodetic papers published in journals or presented at symposia (part B) PART A Book received 92A0042 : Cheney R.E., N.S. Doyle, B.C. Douglas, R.W. Agreen, L. Miller, E.L. Timmermann, D.C. Mc Adoo : The Complete Geosat Altimeter GDR ttandbook, NOAA Manual NOS NGS 7, Rockville, October 1991. 92A0043 : Kinlyside D.A. : Densification Surveys in New South Wales, Unisurv Report S-42, Australia, 1992. 92A0044 : BIPM : 19e Confdrence Gdndrale des Poids et Mesures, Comptes-Rendus Proceedings, 1991. 92A0045 : van der Kooij M.W.A. et al : Preparations for the ERS-1 and TOPEX/POSEIDON satellite altimetry missions, BCRS project n ° OP-3.5, BCRS report n ° 90-28, January 1992. 92A0046 : van Gelderen M. : 7"he Geodetic Boundary

Value Problem in Two Dimensions and its Iterative Solution, Netherlands Geodetic Commission, Publications on Geodesy, n ° 35, The Netherlands, 1991. 92A0047 : De Munck J.C., T.A.TH. Spoelstra : Re[raction of Transatmospheric Signals in Geodesy, Netherlands Geodetic Commission, Publications on Geodesy, n ° 36, The Hague, The Netherlands, May 19-22, 1992. 92A0048 : Conseil Scientifique du GRGS : Vingt Arts de Recherche en Gdoddsie Spatiale, Paris, 1992.

369 92A0049 : Thomas R.H. : Polar Research from Satellites, Joint Oceanographic Institutions, Inc., Washington.

92A0063 : Klotz J. : Eine

92A0050 : Tiberius C.C.J.M. : Quality Control and

Deutsche Geod~itische Kommission, Reihe C, Heft n ° 385, Manchen 1991.

Integration Aspects of Vehicule Location Systems, TU Delft n°l, 1991. 92A0051 : The Future of Spaceborne Altimetry Oceans

and Climate Change, A Long-Term Strategy, the Future Altimetry Working Group, March 1992. 92A0052 : Solid Earth Science in the 1990s, NASA Technical Memorandum 4256, Vol. 1, 1991. 92A0053 : Solid Earth Science in the 1990s, NASA Technical Memorandum 4256, Vol. 2, 1991. 92A0054 : Solid Earth Science in the 1990s, NASA Technical Memorandum 4256, Vol. 3, 1991. 92A0055 : M a r s h a l l J.A., S.B. L u t h c k e , P . G . Antreasian, G.W. R o s b o r o u g h : Modeling

Radiation Forces Acting on TOPEX/Poseidon for Precision Orbit Determination, N A S A Technical Memorandum 104564, June 1992. 92A0056 : Klees R. : L6sung des fixen geodgitischen Randwertproblems mit ttilfe des Randelementmethode, Deutsche Geodfitische Kommission, Reihe C, Heft n ° 382, Mtinchen 1992. 92A0057 : Schreiber R. : Ein Klassifizierender Beitrag sur Abbildungstheorie und numerischen Genauigkeit yon geodfitischen Datumstiberg~,ngen, Deutsche Geodfitische Kommission, Reihe C, Heft n ° 377, Manchen 1991. 92A0058 : Gill E., M. Soffel, H. Ruder, M. Schneider:

Relativistic Motion of Gyroscopes and Space Gradiometry, Deutsche Geodfitische Kommission, Reihe A, Heft n ° 107, Mtinchen 1992. 92A0059 : Feltens J. : Nicht-gravitative StOreinfl~isse

bei des Modellierung yon GPS-Erdumlaufbahnen, Deutsche Geod~itische Kommission, Reihe C, Heft n ° 371, Miinchen 1991 92A0060 : Keller D. : Aufbau eines geodiitischen

Strapdown Inertialsystems zur Punkbestimmung, Deutsche Geodfitische Kommission, Reihe C, Heft n ° 367, Mtinchen 1991.

analytische LOsung kanonischer Gleichungen der geodiitischen Linie zur Transformation ellipsoidischer Fliichenkoordinaten,

Montenbruck O. • Ephemeridenrechnung und Bahanbestimmung geostationiirer Satelliten mit Hilfe der 7'aylorreihenintegration, Deuk~che GeodiJtische 92A0064

Kommission, Reihe C, Heft n ° 384, Manchen 1991. 92A0065 : Engels J. : Eine approximalive Ldsung der fixen gravimetrischen Randwertaufgabe im lnnen-und Aubenraum der Erde, Deutsche Geodfitische Kommission, Reihe C, Heft n ° 379, MLinchen 1991. 92A0066 : Mfiller J. : Analyse yon Lasermessungen

zum Mond im Rahmen einer post-Newton'schen Theorie, Deutsche Geod~tische Kommission, Reihe C, Heft n ° 383, M~inchen 1991.

92A0067 : Bahndorf J. : Zur Systematisierung der

Seilnetzberechnung und zur Optimierung yon Seilnetzen, Deutsche Geodfitische Kommission, Reihe C, Heft n ° 373, Manchen 1991. 92A0068 : Zur Datumsyest/egung und Short-Arc Bahnverbesserung bei der Auswertung yon GPSBeobachtungen, Deutsche Geodfitische Kommission, Reihe C, Heft n ° 388, Mfinchen 1991. 92A0069 : Ehlcrt D. : Differentielle Verschiebungen und Drehstreekungen in dreidimendionalen Koordinatensystemen, Deutsche Geodfitische Kommission, Reihe B, Heft n ° 295, Mfinchen 1991. 92A0070 : Torge W., T. Grote, R.H. R(Sder, M. Schnfill, ft.-G. Wenzel : Introduction of Absolute

Gravimetric Techniques into a High-Precision Gravity and Vertical Control System in Northern tceland, Deutsche Geod~,~tische Kommission, Reihe B, Heft n ° 297, Mfinchen 1992. 92A0071 : Sigl R., W. Ehrnsperger, W. Wende, G. Boedecker, K.H. Neumayer : Das Projekt "Satelliten-

und Inertialgeodiisie" der Bayerischen Kommissions f[ir die lneternationale Erdmessung, Deutsche Geodfitische Kommission, Heft n ° 51, Mfinchen 1991. 92A0072 : Klein G., G. Boedecker, K.H. Neumayer :

Arbeiten zum Thema "Inertia/schwere", Deutsche

92A0061 : Dassing R. : Konzeption eines modularen Echtzeit-Systems ffir die Laserrentfernungsmessung unter besonderer Beracksichtigung der Aufwfirtskompatibilitat, D e u t s c h e G e o d a t i s c h e Kommission, Reihe C, Heft n ° 378, MfJnchen 1991.

Geodfitische Kommission, Heft n ° 49, Mtinchen 1990.

92A0062 : Nothnagel A. : Radiointerferometrisehe

92A0074 : Geiger A., H.-G. Kahle, R. K~chle, D. Meier', B. Neininger, D. Schneider, B. Wirth :

Beobachtungen zur Bestimmung der Polbewgung unter Benutzung Langer Nord-Si~d-Basislinien, Deutsche Geodfitische Kommission, Reihe C, Heft n ° 368, Mfinchen 1991.

92A0073 : Frei E. : Rapid Differential Positioning

with the Global Positioning

System

(GPS),

Schweizerischen Geod~itischen Kommission, 1991.

Dreidimensionales Testnetz Turtmann (1985-1990), Schweizerischen Geod~itischen Kommission, 1992.

370

PART B

92A0075 : TOPEX/POSEIDON Joint Verification Plan, June 15, 1992. 92A0076 : Beutler G. : Himmelsmechanik H, Mitteilungen der Satelliten-Beobachtungsstation Zimmerwald, n ° 28, Bern. 92A0077 : Schtirer M. : Der Schmidtspiegel, Mitteilungen der Satelliten-Beobachtungsstation Zimmerwald, n ° 27, Bern, 1991. 92A0078 : Bauersima I. : Durch GPS Bestimmbare

Arperte der Erdrotation (im rahmen yon 1GS), Mitteilungen der Satelliten-Beobachtungsstation Zimmerwald, n ° 21, Bern, 1992. 92A0079 : Kersting N. : Zur Analyse rezenter

Krustenbewegungen bei Vorliegen seismotektonischer Dislokationen, Schriftenteihe, Heft 42, Neubiberg, 1992.

Geodetic Papers 92B0111 : Dickey J.O. : High Time Resolution Measurements of Earth Rotation, JPL Geodesy and Geophysics Preprint, n ° 211, September 1991. 92B0112 : Gross R.S., J.A. Steppe : The Stability of

the Terrestrial Reference Frame Inferred From Earth Orientation Series, JPL Geodesy and Geophysics Preprint, n ° 212, September 1991. 92B0113 : Gross R.S., J.A. Steppe, J.O. Dickey : The Running RMS Difference Between Length-of-Day and Various Measures of Atmospheric Angular Momentum, JPL Geodesy and Geophysics Preprint, n ° 213, September 1991. 92B0114

:

Freedman

A.P.,

J.O.

Dickey

:

Intercomparison of AAM Analysis and Forecast Data in UT1 Estimation and Prediction, JPL Geodesy and Geophysics Preprint, n ° 214, September 1991.