A strategy for determining the regional geoid in developing countries by combining limited ground data with satellite-based global geopotential and topographical models: A case study of Iran
2006 (English)In: Journal of Geodesy, ISSN 0949-7714, E-ISSN 1432-1394, J. Geodesy, Vol. 79, no 10,11, 602–612- p.Article in journal (Refereed) Published
The computation of regional gravimetric geoid models with reasonable accuracy, in developing countries, with sparse data is a difficult task that needs great care. Here we investigate the procedure for gathering, evaluating and combining different data for the determination of a gravimetric geoid model for Iran, where limited ground gravity data are available. Heterogeneous data, including gravity anomalies, the high-resolution Shuttle Radar Topography Mission global digital terrain model and different global geopotential models including recently published Gravity Recovery and Climate Experiment models, are combined through least-squares modification of the Stokes formula. The new gravimetric geoid model, IRG04, agrees considerably better with GPS/levelling than any of the other recent local geoid model in the area. Its RMS fit with GPS/levelling is 0.27 m and 3.8 ppm in the absolute and relative view, respectively. The relative accuracy of IRG04 is four times better than the most recently published global and regional geoid models available in this area. This progress shows the practical potential of the method of least-squares modification of Stokes's formula in combination with heterogeneous data for regional geoid determination.
Place, publisher, year, edition, pages
2006. Vol. 79, no 10,11, 602–612- p.
gravity database, least-squares modification of Stokes's formula, regional geoid determination, SRTM, GRACE, GPS/levelling, Iran
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:kth:diva-6193DOI: 10.1007/s00190-005-0009-5ISI: 000235270800004ScopusID: 2-s2.0-33746648141OAI: oai:DiVA.org:kth-6193DiVA: diva2:10834
QC 201009062006-10-032006-10-032010-09-06Bibliographically approved