الفهرس 
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Abstract
Some surveyors claimed that problems were experienced when one collects GPS observations beneath high voltage power lines. They had reported quite large anomalies. Still others had reported no problems beneath high voltage power lines. The current paper studies the effect of High Voltage Power Lines “HVPL” on Differential Static GPS observations and results. The study is based upon investigating the results of a GPS network with the alternative results from Precise Level and Traversing technique by classical terrestrial instruments. The network consists of 12 stations where each station was located at a different distance far away from different HVPL. The HVPL have different power capabilities starting 150 kv to 275kv. Although the results of GPS network analysis have shown a very high accuracy, just a few mm for the worst case, the precise leveling shows discrepancies in elevation ranged between 4 cm to 18 cm. On the other side, the traverse results show a harmony with GPS results with considering the differences between the two concepts.