الفهرس 
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Abstract
For monitoring the horizontal movements, a local GPS network consisting of 10 geodetic stations covering the High Dam area and 2 stations from the Regional network that was established since 2000, in addition to 20 permanent stations from Egyptian Permanent Networks. The displacements for each epoch of the observations were adjusted and calculated. The deformation parameters were performed. The results of horizontal displacements show that the value varies between 1.5 to 2.5 mm/yr (±0.7mm). Also, the results of the vertical displacements show that the value ranging between 2.5 to 3.5 mm/yr (±0.9mm). The horizontal rates and strain accumulations are small, that ranging between 0.0007 to .003 μs. The results of the strain parameter refer to the stable of the study area and demonstrate new information about the present state of the High Dam area. For monitoring the vertical movements in the area between the High Dam and Old Aswan Dam, one leveling line was established (RAMZ-Elsadaka). . The rate of the subsidence at most benchmarks of the leveling line ranges between 1 to 2 mm/yr (±0.5mm). The results of the computations of the vertical and horizontal measurements indicate that stability of the area. Interferometric Synthetic Aperture Radar (InSAR) is chosen as the complementary technique to measure the ground deformation of the study area, to overcome the problem of the bad distribution of the GPS stations and low accuracy of the movement rate from GPS in the vertical component. The InSAR velocity maps from Envisat shows that the study area is almost stable, with good agreement with the GPS results, but the most of the study area around the High Dam is suffered from small subsidence that ranging between 0.3 to 1.8 mm/yr (±0.4 mm). On the other hand, the South West part of the study area has positive LOS velocities ranging from 1.4mm/yr to 2mm/yr (±0.5 mm), this means occurring uplift in this area. The plotted time series for selected PS pixels and GPS in the vertical component from Aswan area shows the homogeneity between the GPS and InSAR results. Also, this combination between two techniques displays the most area that suffered from subsidence. There is a small difference which is about 0.45 mm/yr between GPS and PS results.