Messages

1

General / Re: why the error(pix) from GCP is higher than reproduction error without GCP?

« on: November 18, 2022, 05:45:36 PM »

Number of images: 309   Camera stations: 309
Flying altitude: 10 m   Tie points: 96,143
Ground resolution: 3.28 mm/pix   Projections: 666,699
Coverage area: 2.58e+03 m²   Reprojection error: 1.09 pix


other case showed different result.Reprojection error: 1.09 pix, while the image pix is 0.634. in fact, what should GCP's image pix be? 0.5 pix is the perfect?



thank you for answering my question

2

General / why the error(pix) from GCP is higher than reproduction error without GCP?

« on: November 18, 2022, 03:40:03 PM »

Number of images: 295              Camera stations: 286
Flying altitude: 7.45 m                       Tie points: 276,036
Ground resolution: 2.46 mm/pix       Projections: 924,151
Coverage area: 3.34e+03 m²       Reprojection error: 0.531 pix


Reprojection error: 0.531 pix

GCP error in pix: 0.623


after applying GCP, the error in pixel should be smaller than Reprojection error, but the result is different now.

3

General / why there are many hole in sparse point cloud?

« on: October 26, 2022, 06:41:58 PM »

why there are many hole in sparse point cloud?
[/img][/img]

4

General / hole in dense point cloud?

« on: October 20, 2022, 06:56:32 PM »

hole in dense point cloud?
Is it any problem?  it seems some holes (Blue) in the middle in dense pointcloud, but it is fine when generating orthophoto.

5

Camera Calibration / Why the RMSE become negative?

« on: September 26, 2022, 06:49:43 PM »

X error (cm) - root mean square error for X coordinate for all the cameras.
Y error (cm) - root mean square error for Y coordinate for all the cameras.
Z error (cm) - root mean square error for Z coordinate for all the cameras.

this three sections contains negative result in GCPs, is that correct?
it is interesting that the total RMSE remain positive result.
another question: Total (cm): 15 and  Image (pix): 0.6, is it good result for GCPs?