دانشجوی دکتری ژئودزی، کالج سلطنتی سوئد (KTH) و عضو هیئت علمی دانشگاه زنجان
عنوان مقاله [English]
Since 1986, several gravimetric geoid models have been published in the Iran region. It was found that the standard deviation of fitting between these models versus GPS/levelling data in most cases was worse than the currently available global geopotential models. A new hybrid gravimetric geoid model computed (IRG04) by using the least squares modification of Stokes formula based on the recent published GRACE based global geopotential model, the high-resolution Shuttle SRTM global digital terrain model and a new Iranian gravity anomaly database. The absolute and relative accuracies of the new geoid model tested versus the GPS/levelling points and they are estimated about 0.27 m and 3.8 ppm, respectively. Additional comparison between the IRG04 and the recent published gravimetric geoid models shows that the relative accuracy of the IRG04 is almost 4 times better than the most recent published models in this area.