A new digital elevation model over South Africa based on ground and satellite data

This study makes contributions toward development of accurate DEM from ground and satellite data over South Africa. is achieved by preparing recent satellite-based DEMs (AW3D30, SRTM, ASTER, TanDEM-X, MERIT), assessing their vertical accuracy, selecting candidate DEMs, modelling errors for the fusing DEMs. Following removal outliers each DEM, a different number levelling are used in assessment (AW3D30 - 26,364 points, SRTM 25,727, ASTER 23,773, TanDEM-X 25,964 MERIT- 24,485). The standard deviations differences between heights ±5.09, ±7.03, ±9.20, ±4.99 ±8.36 m AW3D30, MERIT, respectively. AW3D30 therefore selected fusion. two improved applying combination linear regression, multiple adaptive terrain-dependent methods using 17,307 model points. A fused developed fusion assessed 8,657 points (distinct points). deviation height ±4.290 m, it more than all based considered this study.