Fig. 1. Number of image strips
Fig. 2. GCPs bias cases (a) Case Bias1, (b) Case Bias1/2, (c) Case Bias6
Fig. 3. GCPs density cases (a) Case Density1, (b) Case Density2
Fig. 4. Test area and GNSS-surveyed point distribution
Fig. 5. Error vectors at check points with no GCPs (a) on-the-fly calibration, (b) prior project calibration
Fig. 6. Accuracy decrease for blocks [on-the-fly calibration] (a) horizontal errors (b) vertical errors
Fig. 7. Accuracy decrease for blocks [prior project calibration] (a) horizontal errors (b) vertical errors
Fig. 8. Errors as GCPs density increases [on-the-fly calibration]
Fig. 9. Errors as GCPs density increases [prior project calibration]
Table 1. Specification of the drone and camera
Table 2. Accuracies of bundle adjustments without GCPs
Table 3. Accuracies of bundle adjustments with GCPs
Table 4. Accuracies for different numbers of strips
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