Increasing number of images calibrated during AT

RE: Increasing number of images calibrated during AT

Oto — Wed, 30 Nov 2022 11:22:59 GMT

Yes completely forgot about downsampling it can also do the trick as virtually increases search area.

RE: Increasing number of images calibrated during AT

Jason Hagon — Wed, 30 Nov 2022 09:28:12 GMT

Thanks Oto, I just thought I would post some of our findings in case anyone else has a similar situation. As the LiDAR sensor was dictating the flight parameters in-terms of overlap, we knew the image acquisition would not be optimal. Eventually we found that the most effective way of increasing the number of calibrated images (aside from using the stated AT settings) was to use the image down sampling option. While this does have an effect on the number of tie points generated, our goal here was to produce an orthomosaic. We found very little difference between down sampling between 50% and 25% so decided to run with 50%.

RE: Increasing number of images calibrated during AT

Oto — Mon, 12 Sep 2022 10:36:57 GMT

Overlap is too small especially in woodland. For woodlands 85% overlap may be needed and fly higher(100m) so it covers more area and can get more tie points.

Only option which can help in this situation is to use Pair selection mode - sequence if the flight is such. Also reuising and locking calibration from previous 3D flight could help. As last resort using preset "legacy engine"
Pix4D may calibrate more but models are less accurate as it is more suitable for orthophotos.