The Use of Quasigeoid in Leveling Through Terrain Obstacles

In these paper are presented two ways of performing leveling through terrain obstacles. They use properties of the quasigeoid course with respect to the ellipsoid within a given area. The analysis of changes in quasigeoid to ellipsoid slope have been made on the basis of the national quasigeoid models, calculating the slope components ξ, η. This allows to present practical recommendations for location of intermediate benchmarks in the leveling methods through obstacles.