Document Type : Research Paper

Author

• Abbasali Salehabadi

Master of Geodesy

Abstract

New methods of tunnel construction and its applications, especially in management and control, usually call for sufficient attention to tunnel’s directing process. New surveying equipment and technologies such as GPS and its long-standing rival, Gyro-theodolite, are able to fulfil this need. On the whole, increase in precision of measurements indicates the necessity of special attention to difficulties of underground surveying.