Iag International Association of Geodesy Association Symposia and Workshops
نویسندگان
چکیده
Determination of the geoid with a high accuracy is the main task among researchers in the geodetic community. Precise determination of a regional geoid is usually carried out combining a global geopotential model data with a set of point or mean terrestrial gravity anomalies measured in the region and some topographic information. In this research a primary Iranian gravimetric geoid model has been computed by combination of EGM96 global geopotential model and terrestrial surface gravity anomaly data in grid. We selected the Molodenskij approach, instead of classical Stokes idea, for determination of the quasi-geoid first. The topographical effects in terms of G1 and G2 are computed by a regional available DEM data. The Vanček and Kleusberg modification of the integration kernels were used in order to reduce the contribution of far zone effects. Finally the geoid was restored by correcting the quasi-geoid. The so-determined geoid was then compared with a geometrically determined geoid by GPS at some height network points in the region. The differences in absolute values of the geoid heights were 0.16m maximum, -2.26m minimum, and -0.87m in average on 22 check points.
منابع مشابه
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