Meranie výšky nadzemných vedení

When solving the problem of height measurement within network of overhead power lines the following two alternatives of approach based on apparatus requirements and on procedure were considered. Both the effectiveness of altimeter used in forestry and of basal measuring part of guide bar with a stable and a sliding optical prism of steropair tacheometer were analysed. After having performed field measurements by using the two above mentioned devices we came to the conclusion that the application of forestry altimeter is featured by several disadvantages when compared with picture-pair tacheometer, mainly lower accuracy, more difficult operation, necessity of co-workers and inability to function in inaccessible terrain.