Accurate determination of the geoidal undulation N

• Autorzy: Lambrou E. , Pantazis G. , Balodimos D.
• Konferencja: Geodetic and Geodynamic Programmes of the CEI (Central European Initiative) ( 6-11.04.2003; Nice, France)
• Języki publikacji: EN

Abstrakty

EN

This work, re!ated to the activities of the CERGOP Study Group Geodynamics or the Ba!kan Peninsula, presents a method for the determination or the variations AN and, indirectly, of the geoida! undulation N with an accuracy of a few millimetres. It is based on the determination of the components of the deviation of the vertical using modern geodetic instruments (digital total station and GPS receiver). An analysis of the method is given. Accuracy of the order of O.Olarcsec in the estimated values of the astronomical coordinates and lambda is achieved. The result of applying the proposed method in an area around Athens is presented. In this test application, a system is used which takes advantage of the capabilities of modern geodetic instruments. The GPS receiver permits the determination of the geodetic coordinates in a chosen reference system and, in addition, provides accurate time information. The astronomical observations are performed through a digital total station with electronic registering of angles and time. The required accuracy of the values of the coordinates is achieved in about four hours of fieldwork. In addition, the instrumentation is lightweight, easily transportable and can be setup in the field very quickly. Combined with a stream-lined data reduction procedure and the use of up-to-date astronomic data, the values of the components of the deviation of the vertical and, eventually, the changes deltaN of he geoidal undulations are determined easily and accurately. In conclusion, this work demonstrates that it is quite feasible to create an accurate map of the geoid undulation, especially in areas that present large geoid variations and other methods are not capable to give accurate and reliable results.

Słowa kluczowe

EN

geoidal undulation; CERGOP programme

PL

CERGOP program; falistość geoidalna

• Wydawca: Wydział Geodezji i Kartografii Politechniki Warszawskiej
• Czasopismo: Reports on Geodesy
• Rocznik: 2003
• Tom: z. 1/64
• Strony: 165--172
• Opis fizyczny: Bibliogr. 13 poz., schem., wykr.

Twórcy

autor

Lambrou E.

• National Technical University of Athens, School of Rural and Surveying Engineering, Departament of Topography - Laboratory of General Geodesy

autor

Pantazis G.

• National Technical University of Athens, School of Rural and Surveying Engineering, Departament of Topography - Laboratory of General Geodesy

autor

Balodimos D.

• National Technical University of Athens, School of Rural and Surveying Engineering, Departament of Topography - Laboratory of General Geodesy

Bibliografia

• 1. Balodimos, D. D. (1972a), Geoidal Studies in Greece, Department of Surveying and Geodesy, University of Oxford (D Phil Thesis Oxon, UK)
• 2. Balodimos, D. D. (1972b), personal notes.
• 3. Balodimos D. D, Korakitis R., Lambrou E., Pantazis G. (2003), Fast and accurate determination of astronomical coordinates φ, λ and azimuth, using a total station and gps receiver, Accepted paper for publication in Survey Review.
• 4. Bomford, (1971), Geodesy, 3rd edition, Oxford University Press, Claredon Press, UK.
• 5. ESA, (1997), The Hipparcos and Tycho Catalogues, ESA SP-1200, France.
• 6. Hg E. et al, (2000), A&A, v.355, p.L27.
• 7. Lambrou E., (2003), Astrogeodetic Observations using Digital Geodetic Instruments, NTUA, School of Rural and Surveying Engineering (In Greek), Doctoral Thesis in progress.
• 8. Leica Heerbrugg AG, (1997), Users manual for TM 5000/ TDM 5000 system, V2.2, Switzerland
• 9. Marriot Chris, (1992-2001), Skymap Pro Version 8, Thompson Partnership, U.K.
• 10. Mueller lvan, (1969), Spherical and Practical Astronomy as Applied to Geodesy, Frederick Ungar Publishing Co, New York, U.S.A.
• 11. Seidelmann P. Kenneth, (1992), Explanatory supplement to the Astronomical Almanac, University science Books, Mill Valley, California, U.S.A
• 12. Torge Wolfrang, (1991), Geodesy, Walterde Gruyter Berlin, New York
• 13. Trimble Navigation, (1990), Operation Manual for model 4000DL, Revision A, Sunnyvale, California, U.S.A