national report of the federal republic of germany on the geodetic ...

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Foreword The XXIII General Assembly <strong>of</strong> <strong>the</strong> Inter<strong>national</strong> Union <strong>of</strong> Geodesy and Geophysics (IUGG) to be held in Sapporo, Japan, from June 30 to July 11, 2003, provides an excellent opportunity for taking a look back to <strong>the</strong> developments in <strong>the</strong> various fields <strong>of</strong> Geodesy and Geophysics within <strong>the</strong> past four-years period. In <strong>the</strong> following <strong>report</strong> a summary and overview <strong>of</strong> <strong>the</strong> geodetic activities in <strong>the</strong> period 1999-2003 in <strong>the</strong> Federal Republic <strong>of</strong> Germany will be given. The <strong>report</strong> has been organized according to <strong>the</strong> hi<strong>the</strong>rto existing structure <strong>of</strong> <strong>the</strong> Inter<strong>national</strong> Association for Geodesy (IAG) which has been valid since 1991. According to <strong>the</strong> IAG by-laws <strong>the</strong> scientific work is distributed over <strong>the</strong> five sections covering <strong>the</strong> main aspects and topics in contemporary geodesy: – Section I (Positioning) concentrated on <strong>the</strong> positioning aspects in geodesy. It considers high precision horizontal and vertical networks, inertial and kinematic positioning, geodetic astronomy, marine positioning and refraction studies. In <strong>the</strong> past period, main emphasis has been given to GPS-related subjects (<strong>the</strong> wide area <strong>of</strong> modelling for precise GPS positioning, regional permanent arrays, multipath mitigation and atmospheric sensing). – Section II (Advanced Space Technology) deals with <strong>the</strong> development <strong>of</strong> space techniques such as microwave and laser tracking, radio-interferometric techniques, satellite altimetry, satellite-to-satellite tracking, and satellite gradiometry. The areas <strong>of</strong> spaceborne interferometry, spaceborne GNS atmospheric sounding, GPS water level measurements, precise orbit determination and calibration/validation <strong>of</strong> gravity field missions are described in separate sub-sections. – Section III (Determination <strong>of</strong> <strong>the</strong> Gravity Field) is concerned with <strong>the</strong> measurement and evaluation techniques <strong>of</strong> terrestrial and airborne gravimetry as well as global and regional gravity field modelling and (non-tidal) gravity variations. Special attention has been given to <strong>the</strong> validation <strong>of</strong> digital terrain models, <strong>the</strong> combination <strong>of</strong> terrestrial and satellite based gravity data, syn<strong>the</strong>tic modelling <strong>of</strong> <strong>the</strong> Earth’s figure and gravity field, regional geoid modelling in continental and oceanic regions, and altimetry data processing. – Section IV (General Theory and Methodology) deals with fundamental aspects <strong>of</strong> <strong>the</strong> ma<strong>the</strong>matical and physical modelling <strong>of</strong> geodetic observations as well as stochastic and non-stochastic methods <strong>of</strong> data evaluation. Special emphasis has been given to <strong>the</strong> use <strong>of</strong> wavelets, non-probablistic assessment in geodetic data analysis, fractal geometry, <strong>the</strong>ory <strong>of</strong> fundamental height systems, joint inverse gravity modelling, and consistent dynamic <strong>the</strong>ories <strong>of</strong> deformation and gravity field. – Section V (Geodynamics) covers <strong>the</strong> area <strong>of</strong> monitoring and study <strong>of</strong> time-dependent phenomena (polar motion, Earth rotation, Earth tides, recent crustal motions, gravity, sea surface topography and mean sea level). Specific topics are geodetic effects <strong>of</strong> non-tidal oceanic processes and fundamental parameters. With <strong>the</strong> IUGG General Assembly in Sapporo <strong>the</strong> structure <strong>of</strong> <strong>the</strong> IAG will be changed significantly. Much work and efforts <strong>of</strong> many colleagues have also been devoted to <strong>the</strong> preparation and implementation <strong>of</strong> <strong>the</strong> new structure within <strong>the</strong> past four-year period. The editors <strong>of</strong> this volume and <strong>the</strong> German Geodetic Commission acknowledge <strong>the</strong> work <strong>of</strong> all our colleagues that have contributed to this <strong>report</strong>. The financial and logistic support by <strong>the</strong> Bavarian Academy <strong>of</strong> Sciences for publishing and printing this volume is highly appreciated. This <strong>report</strong> can be found in electronic form on <strong>the</strong> web-site http://www.dgfi.badw.de/dgfi/DOC/2003/b312.pdf. The complete volume can also be received on CD from <strong>the</strong> Secretary <strong>of</strong> <strong>the</strong> German Geodetic Commission (Dipl.-Ing. Helmut Hornik, Deutsche Geodätische Kommission, Marstallplatz 8, D - 80539 München, fax +49 - 89 - 23 031 -283 / -100, tel. +49 - 89 - 23 031 113, e-mail hornik@dgfi.badw.de) Bernhard Heck National Committee for Geodesy and Geophysics Reinhard Rummel Permanent Secretary <strong>of</strong> <strong>the</strong> German Geodetic Commission Helmut Hornik Secretary <strong>of</strong> <strong>the</strong> German Geodetic Commission 3
Page 1 and 2: DEUTSCHE GEODÄTISCHE KOMMISSION be
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Introduction Atmosphere sounding us
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Introduction Due to the</st
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new satellite missions - also new m
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