I took some photos of a Cauliflower field from around 2m high. I uploaded the images onto WebODM and an orthomosaic image was created. The ortho however doesn’t have near the level of detail I require to estimate the number of vegetables I have growing.
Is there a height limiter? Is there a way to change this?
I have shared 2 dropbox links, one shows the output I get from WebODM and the other the photos I collected using my drone. You will clearly see the difference.
I’d really appreciate any help and guidance.
I use WebODM and DockerDesktop on a Mac running Monterey Version 12.3.1. Please let me know if any further information is required.
2m is far too low. I’d suggest 5mm GSD is plenty to count even small cauliflower plants, so depending on what drone you have 15 or 20m would give a better result
to add just a bit to what Gordon wrote. I would suggest changing aspect ratio to 3:2 with air 2s instead of 16:9, with 16:9 you are automatically cropping the image.
with that camera from 20 meters your GSD would be around 5.5 MM and would need to space images out about 7.5 meters for a side overlap of 75%.
Guys thanks so much for your feedback, super useful. We flew low yesterday becuase aside from stand count we are trying to find out how many of our plants are unproductive and we thought that flying higher wouldn’t be sufficient.
So I understand, what prevents the ortho stitching from working when flying low? Why am I getting such a pixelated image?
If it was something I needed to do, I’d draw a grid over the field, say 1m X 1m, and count the plants in a few representative squares, take the average of them, then multiply by the total number of squares, adjusting for any part-filled squares around the edges.
