I’ve already seen tutorials about combining laser scan and photogrammetry, and I have some experience working with this (I’m facing my 4th model).
I’m dealing with a problem that I don’t know how to face. I have 9 laser scans aligned (imported as main value color and draft registration) and a set of photographs of a model.
If I work only with the laser scan, RC is able to align all the scans and I get a point cloud that seems correct.
If I work only with photographs, RC is able to align 95% of them and I get a point cloud that seems correct.
If I work with laser scan and photographs, RC creates a component for the photographs and several other photographs with parts of the scanners… Even some of the scans are broken into different components… I have tried using exact and unregistered as import settings of the laser scans, but I’ve obtained same result.
I have tried to generate one component for the alignment of the photographs and one for the laser scans, and import both to a new model to merge them. But, the result is one component for the photographs and one component for the laser scans. The second one displays a disconnected point cloud for each scan (WTF!?). I attach an image.
I have been checking the generated lsp images, and it is weird because there are some parts with no information. I attach an image:
Why lsp images can be like this? Can be this the cause of not being able to merge both components or align both sources? Any idea if any other thing can be the cause?
when you have generated two components (first from images and second from scans) then use control points there. These control points should be placed over a whole component and you have to place it on both components. You will need minimally three points, but more is better. The control points should be placed over minimally three images and also three LSP (this is mostly unreachable, because you need to think about this during data capturing). If you will have placed these points, then just click Align and the components should merge.
About the LSPs, did you cut your laser scan in some registration software? This means, that some parts of laser scan pointcloud were deleted.
Thanks for the reply. I’ll try to place Control Points, although I’d like to avoid it because we didn’t place it during data capturing. I’ll try to place them in some features of the model and I’ll update with the results.
About your question about LSPs. I don’t know if the laser scan were filtered using some registration software, this was done by a former member of the team. However, I’ll try to investigate it also.
I have alreay marked 9 control points in several images (average of 8 images per control point including lsp and jpg). I have used features of the wall paintings as control points, and also some corners of structures present on the walls. But, In have obtained no improvement…
I’m obtainting one component only, but photogrammetry and laser scan are not registered correctly. Also, the control points are floating on the middle of nowehere…
Any idea about what to do? or how to identify the problem to try to solve it?