Survey.
leveling between two widely separated points in which observations are made in both directions to eliminate the effects of atmospheric refraction and the curvature of the earth.
Survey.
leveling between two widely separated points in which observations are made in both directions to eliminate the effects of atmospheric refraction and the curvature of the earth.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012