surveying indirect leveling ₪ 1.3 Case where the distance following the slope Dp is not measurable

 This is the case if the slope is uneven, on strongly bumpy ground, for exemple, if there are obstacles, etc.

it is necessary to calculate the hoirizontal distance Dh from the station S from the readings on a surveying rod placed at A.

Dh is determined bt stadiometer from the m1, m2 and V readings.