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Topics - mfrancia

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General / Holes in point cloud and distortion around trees
« on: October 09, 2023, 01:07:19 AM »
Hi everyone,
I'm currently working on a dataset of UAV images of avocado trees and I want to generate an orthomosaic, but I'm getting some problems when building it. The main problem is that there're holes in the point cloud around the trees, that leads to some distortion in the DEM, Mesh and orthomosaics. I've already tried some solutions such as classify ground points, build the orthomosaic based on a mesh, use a lower quality in the alignment of the images (that generates more points around the trees, but not enough and reduces significantly the orthomosaic quality) and use more quantity of tie points, but none of them has worked as expected.

I believe the problem might be due to the movement of the trees caused by the wind, the complexity of the branches, and the angle of the camera, but I'm not sure how to solve it.

I've put the images of tie points, point cloud, 3d model and orthomosaic in the attachments. Hope it helps to understand the problem.
Thank you in advance!

By the way, the photos that I'm using have this characteristics:

Type of data:   RGB Bird-view images
Unmanned Aerial Vehicle DJI Phantom Pro 4:
Max H-Speed:72 Km/h
Max V-speed:35 km/h
Weight 1.5 Kg
Action radius 500 m
Autonomy 20-30 Min
Radio control Frequency 2.4 GHz

RGB Camera:
Sensor CMOS
Lens: 8.8 mm/24 mm
FOV: 84°
Resolution: 5472 × 3648
Supported formats: JPG, PNG and RAW
Operating Temperature Range: 0° to 40°C

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