| 等级 | 测角中误差(") | 测距相对中误差(mm) | 测回数 | 方位角闭合差(") | 导线全长相对闭合差 | ||
| J0.5 | J1 | J2 | |||||
| 二等 | 1 | 1/250,000 | 6 | 9 | / | 2.0√n | ≤1/100,000 |
| 隧道二等 | 1.3 | 1/250,000 | 6 | 9 | / | 2.6√n | ≤1/100,000 |
| 三等 | 1.8 | 1/150,000 | 4 | 6 | 10 | 3.6√n | ≤1/55,000 |
| 四等 | 2.5 | 1/80,000 | 3 | 4 | 6 | 5.0√n | ≤1/40,000 |
| 一级 | 4 | 1/40,000 | / | 2 | 2 | 8.0√n | ≤1/20,000 |
| 二级 | 7.5 | 1/20,000 | / | 1 | 1 | 15√n | ≤1/12,000 |