Hi, I want to run a 3D mapping of a small brick bridge located above a stream of water , using my UAV (APM 2.6 and grounstation Mission Planner)
For nadir image I’ll use Canon S100+CHDK (altitude for example 50 mt) and, to detect the best profile of the bridge and improve more accuracy reconstruction , I would like to take pictures to 45° and horizontal also (always with UAV)
My question:
1°: - Can I use, for 45° and horizontal images, different camera on my UAV (for example GoPro hero4 with Gimbal) or for best accuracy reconstruction should I use same “nadir” camera (Camera S100)
2°: - 45° and horizontal images from UAV, must be georeferenced also (like nadir image) ?
It is possible to create projects using different datasets ( aerial nadir / aerial Oblique / terrestrial) using the same or different cameras.
In our Chillon Castle project, we used several drones, cameras, and used aerial nadir, aerial oblique and terrestrial (indoor and outdoor) images to create one single project: https://support.pix4d.com/hc/en-us/articles/202557199
So the ideal is create 2 sub projects, one with the aerial images, another with the oblique images, add GCPS and add manual tie points (using the same manual tie points):
Create sub project A (Aerial images)
Create 10 -15 Manual tie points, for example, pp1, pp2, pp3, pp4, pp5…
Mark each Manual tie point in at least 3 images.
Process step 1.
Create sub project B (oblique images)
Create the same 10 -15 Manual tie points created in the sub project A and give them the same names than in the sub project A (pp1, pp2, pp3, pp4, pp5…)
Mark each Manual tie point in at least 3 images.
Process step 1.
Merge the projects by creating a new project: the software will ask if the Manual tie points with the same names are the same tie points, click YES and once is processed.
Might this workflow also apply to vegetated or forested areas? I have been having difficulty processing a 250 acre property site that is approx 50% covered by waist high grass and jungle canopy. Been flying 300’ in nadir with Phantom Pro 4 v.2.0 but approx 15% of images wont calibrate and are lacking automatic tie points. Thanks for your help, Marc.
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