Camera Altitude Errors after Alignment

Land survey without PPK flight logs, camera rough GPS + ground control points.

These high cameras look odd and are clearly not at the drone elevation. I have ground control points marked in the general flight altitude and in some of these high camera images with little pixel error. I tried disabling these cameras and re-aligning however this resulted in fewer registered cameras much less that I had disabled. Perhaps indicating that those high cameras are part of the registration.

I was debating to leave alone, or disable them before model building. Is this expected or does it indicate registration error?

Zuzana Ďuríčková CR

March 05, 2021 08:38

Hello Wayne,

those cameras are incorrectly aligned. Please try to group images w.r.t to exif by clicking on the Images sign in 1Ds and selecting Group:

Then in the alignment settings please change the distortion model to Brown 4 with tangential 2 and align again.

Also, in the screenshot, it seems that your ground control points are in a different vertical system than ellipsoidal heights from GPS priors. This causes the constant vertical shift on each camera. I would recommend disabling camera priors in the Alignment settings and use only GCPs for georeferencing.

Camera Altitude Errors after Alignment

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