I have a 40-acre field that I would like to map every week using the same flight path. The flight last week went great and Agisoft stitched and processed all pictures with great results (around 250 pictures). Yesterday I do the exact same flight with the same number of pictures, and Agisoft can barely stitch half of them.
For last week's flight it reported an average altitude of 110 m (it was actually 100 m). But for the pictures that Agisoft was able to stitch it claims that the altitude is 80 m when it was really again 100 m.
What went wrong? I didn't do anything differently. Like I said, same flight path, same camera settings, same processing options. Any ideas are welcome.
Replies
Plant growth.
Some things to check:
- was the camera zoomed in? That could reduce your overlap.
- what is the quality of the images, are they heavily blurred?
- not sure if agisoft relies on having GPS positions in the exif to do some kind of initial matching. Check if the positions are there (could be a step that was forgotten too).
- what is the exposure for the pictures, are they all about the same? Not all feature matching algorithms can deal with differences in exposure. Could have an impact too because of cloud cover conditions.
- if the gps positions in the pictures are completely wrong, then perhaps the radius it considers to match with other photos is off. Then you could try another initial matching method (or match every picture against the other) to see if that improves results.
Thanks for the suggestions.