We've been dabbling in drone aerial imagery, using P4pro (vertical shots) and Recap, getting some relatively good results, however the occasional odd-ball, like this one where the mosaic is titled. It has four GCP points in it, although they are only on the road, i.e. not out to the sides. Through Recap photo I can "rotate the gimbal" to correct the tilt and get a decent plan image out of it. But does anyone know an obvious reason why the processing spat out a tilted mosaic?
Its the geometry.?ÿ You have to get control on the outside of the project too.?ÿ How could you know which way or how far to adjust it to fit reality if you don't know what reality is?
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As Rochs01 mentioned. You need more GCP that wraps the perimeter of your work area.?ÿ WithOUT PPK or RTK, four points along the road will not work. The project will be distorted immediately beyond your GCP's, as you have noticed. Recommend you do more ground-truthing to see how poor the data is.
