Hey there,
i was watching a video from the Youtuber “Visual Joy”.
In one Video he stated that WEBODM would give better results flying one grid with 90degree gimbal and one with 85 degree gimbal with a height diffrence of about 10m. Anyone tried this and gets better results ?
Are there any other Mappping courses / guidelines online avalible that are worth looking deeper into ? Mabe someone has some examples ?
Best
You need oblique images to get a good camera calibration, if not you might get bowling.
@APOS80, are you only usin obliwue images (which is as far as i understood 40-45 degree gimbal) or are you using photos with 90 degree and 40-45degree gimbal for the Projects ?
It depends on what I want to capture. If it’s just ground then maybe about 75-80 degrees and flying in a crosshatch pattern.
I’m learning still but I’ve observed that the more oblique images you got the easier for WebODM to get a good calibration. ORB seems to need more oblique images than Sift/Hahog to get a good calibration.
Hahog has worked the best for me, it’s way faster than sift but much safer than ORB.
What do you mean by “bowling” ? Best
The cloud can get a bent shape.
Hello DvM,
There is a pretty good explanation and example of the “bowl” effect here:
https://www.pix-pro.com/blog/post/bowl-effect
I have experienced it myself, it’s a hazard of processing without GCPs.
Cheers,
Jeff
Some discussion of it here: Avoiding Bowling over large areas
and see Stephens blog, linked in the first post, which shows a large area with pronounced bowling.
Rolling Shutter Distortion Correction can also help rectify this distortion over large areas, so all isn’t lost on already collected data that hasn’t had that flag enabled on it yet 
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