Abstract
In continuation of earlier work on the geoid of Eastern Africa a further study has been undertaken to determine the geoid of Tanzania, bounded by latitude −12° ≤ φ ≤ -1°, longitude 29° ≤ λ ≤ 40°. The geoid was determined at a resolution grid of 5 minutes of arc. The Geodetic Reference System 1980 (GRS80) was used. The data used included the EIGEN-GRACE02S geopotential model to degree and order 120, a recent terrestrial gravity data anomaly set, marine (ship track) gravity and satellite radar altimetry data. A digital terrain model derived from the Shuttle Radar Topography Mission (SRTM) was also used to compute topographical effects. The spherical one-dimensional fast Fourier transform (FFT) method was used to compute the geoid heights residual to the geopotential model. Internal error propagation was used to get a pessimistic accuracy estimate of 30cm, and comparisons are made with heights derived from Transit Doppler observations co-located with trigonometrically determined heights. Gravimetric geoid height differences were compared with corresponding astrogeodetic geoid height differences provided by a 970 km geoidal section.
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