Rapid and Precise Measurement Method for Track Static Geometry of Large-Span Bridge Railway

Table 2

Statistical parameter changes of residuals before and after registration in northward direction.

	Max absolute value (mm)	Average (mm)	Standard deviation (mm)	Slope of trend-fitting line
Before registration	157.7	−123.4	9.2	9.39 × 10^−5
After registration	34.2	−6.3	7.7	6.32 × 10^−6