The application of 3S in investigation and design of electric power transmission line

The paper gives a brief discussion of how to collect terrain data from papery topographic maps to generate DTM, and introduces the method of making orthoimages with radiometric correction and geometry rectification. DTM data and orthoimages are used as the basis for designing transmitting lines and generating section maps. 3D data and GPS are utilized for field survey. Finally GPS field survey data are added into images to modify and settle position of telegraph poles.