Hi RC-users
I’m evaluating RC to use it for capturing roof and facade data with a Mavic Pro2. I took 430 pics of a small house using the pix4dcapure app, flight height 15m, grid. no ground control points but using visual control points to improve alignment in RC. I have followed the online course, nevertheless I cannot get the white facades to show in the pointcloud, despite processing with different data sets from different flights with different camera angles (70%-45% degrees) and horizontal/vertical overlaps of at least 80%.
I believe the data should be sufficient but that I’m missing something in the RC workflow or its settings to get better results. Any hints/input most appreciated, thank you!
Hello @3D_BG
This is a general problem for photogrammetry, as white walls don’t have visible features, which can be used in the process.
Hi Otrhan and many thanks for your input! I am aware of this “general problem” but there must be ways to overcome this in RC; I used to work with the pix4d algorithm for photogrammetry and never had issues with white facades (facades are often white), they always came nicely in the reconstructed pointcloud
Basically, it is possible to reconstruct also the white façades, as the are not totally white.
In your case there could help some kind of delighting. It looks like you captured the images in the sunny day, the ideal conditions for photogrammetry is overcast. Therefore the walls seems to be too bright and it is not possible to find any features for reconstruction there (in this case it is similar to water).
Have you tried to capture also terrestrial images?
Hi there and thanks for your input. I wil do another data capture on an overcast day and see if this helps. Re terrestrial; no I have not tried that, since I only use RC to process UAV data, covering areas our terrestrial laser scanner cannot reach. I will report back how it goes when I have tried your suggestion!
Capture white facade on a overcast day. When taking pictures use RAW format so you can adjust the highlights, shadows, exposure and use microcontrast for more details.
Also a polarized lense in front of the camera will help with reflections.