Camera Calibration for Long-Distance Photogrammetry Using Unmanned Aerial Vehicles

Table 3

Distance errors of the two marks (unit: m).

Group number	Measured length	Reconstruction length	Absolute errors	Relative errors
1	24.25	24.36	0.11	0.45%
2	32.83	32.77	0.06	0.18%
3	46.60	46.48	0.12	0.26%
4	46.60	46.50	0.10	0.21%
5	30.00	29.95	0.05	0.17%