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 | 1.1 mm < 2 mm | 2.1 mm < 3 mm | 3 mm < | ||||
1st | 270 | 167 | 76 | 27 | - | 0.56 | 0.22 |
1161.7 | 673.1 | 363.0 | 135.6 | - |