Pix4Dmapper - Large agriculture and vegetation, 3 differents flights, very hard to process

Hi,

I'm having an hard time to properly process 3 differents flights in one project. The object of the survey is a large and mostly flat agriculture land with some sectors covered in vegetation. We perform 3 differents flights for about 900 photos, 70 mt altitude with an high overlap, so I tried the following:

  • Process the whole data as one project and "standard" settings, resulting in an inclined surface, several sectors empty and several errors reported in the process
  • Process 3 sectors separately, trying either the standard settings, either the following the "alternative" calibration method with 1/2 keypoint image scale
  • Merge the 3 sectors eventually

I've already tried to follow the advices found in these articles

https://support.pix4d.com/hc/en-us/community/posts/360000479126-Lots-of-uncalibrated-cameras-in-a-dense-vegetation-map-project

https://support.pix4d.com/hc/en-us/articles/202560159-How-to-improve-the-outputs-of-dense-vegetation-areas-

results remains very poor

https://we.tl/t-ztGlSJ9MvF Here's my process report

Also, here's some screenshots of the results... even if the altitude was always the same, it looks like the 3 flights has been placed at differents altitudes...



Maybe somebody could provide some advice?

 

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