Ecology, Environment and Conservation Paper

Vol.17, Issue 4, 2011; Page No.(653-659)

COMBINATION OF SATELLITE ALTIMETRY DATA AND EGM2008 MODEL FOR EVALUATION OF THE HEIGHT DATUM IN IRAN

R. Kiamehr, M. Abrehdary and S. Salkhordeh

Abstract

The repetitive periodic coverage from Topex/Poseidon altimetry satellite during 1992-2003 from the Oman Sea and Persian Gulf were used to prepare time series covering the study area. The linear portion of series were analyzed to calculate mean sea level as its temporal changes using the least-squares method. Due to the significance of sea level topography in oceanographic studies a new model proposed using the combined altimetry satellite data and the EGM2008 global geoid model in order to determine and equalize the current height datum for Iran. The maximum and minimum of sea surface topography vary within the range of -0.7 to 1.1m in the study area. Adjustment of the current precise network for Iran established based on the Bandar Abbas tide gauge station, which its corresponding SST estimated up to -0.5 m. Effect of such large systematic error in national height system cannot be ignored in geodynamical and engineering researches.

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