Abstract
Mean 5′ × 5′ heights and depths from ETOPO5U (Earth Topography at 5′ spacing Updated) Digital Terrain Model (DTM) were compared with corresponding quantities of a local DTM in the test area [38°≤ φ ≤ 40°, 21°≤ λ ≤ 24°]. From this comparison a shift of ETOPO5U with respect to the local DTM in the longitudinal direction equal to 5 min was found after applying an efficient fast Fourier transform (FFT) technique. Furthermore, sparse mean height differences larger than 1,000 m were observed between ETOPO5U and the local DTM due rather to errors of ETOPO5U. The effect of these errors on gravity and height anomalies was computed in a subregion of the area under consideration.
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