Order

Number of sections

Number of sections

The mean square error in 1 km leveling route

Distance of route, km

Distance of line, km

Random error, mm

Systematic error, mm

≤1 mm $\sqrt{L}$

1.1 mm $\sqrt{L}$ < 2 mm $\sqrt{L}$

2.1 mm $\sqrt{L}$ < 3 mm $\sqrt{L}$

3 mm $\sqrt{L}$ <

1^st

270

167

76

27

-

0.56

0.22

1161.7

673.1

363.0

135.6

-