Hello (ContextCapture Update 19,10.19.0.122)
I have been doing Reconstruction from Aerotriangulations of a city, the problem is that in some buildings, the program can not make or construct a complete one, for example:
What can I do? to attack these perturbations?. A similar case is that some buildings are deformed, like this:
I used 3D Polygon for geometry constraints but didn't planarize the building. Sincerely I don't know how to attack these problems.
These are the parameters I use for reconstruction:
Do I need some low-level settings? or some code? to fix these problems?
Is this a production from Nadir imagery only?
Yes, it is.
So, if you look in top view, the model looks fine? Having obliques imagery could have helped to correct this melting effect. Basically this is happening because there is no or not enough images that cover the sides of buildings.
If you look in C:\Program Files\Bentley\ContextCapture\doc and look at the "Drone Capture Guide". The section about the "Comparison of Nadir vs. Nadir + Oblique" will give you explanations about this situation.
Yes, how can I attack these problems? For example, with another program (trial) with the same imagery, I put the 3D polygon constraint and fixed the hole.
Will be impossible to be fixed like this or similar?
I suggest you to use the touch up tools. Below are 3 youtube videos about this topic.
ContextCapture Tutorial: Touch-up (Part 1/3) - YouTube
ContextCapture Tutorial: Touch-up (Part 2/3) - YouTube
ContextCapture Tutorial: Touch up (Part 3/3) - YouTube
Does exist a possibility to create a 2.5d mesh reconstruction?
You can get a 2.5d orthophoto production.
www.youtube.com/watch
Answer Verified By: Felix James
In the end, Nadir Imagery is useless in ContextCapture. It doesn't exist any way or solution to fix those buildings....
The only way to fix these building holes is to use the touch up tool as mentioned yesterday. I wouldn't say that Nadir imagery is useless. It always depends on the type of mesh you want to achieve. In such an area, if the sides of the buildings are important and you want to deal with "holes" and "melting" effect as little as possible, then combining Nadir and Oblique imagery is a must.
For Nadir it also helps to reuse 3D calibration - https://communities.bentley.com/products/3d_imaging_and_point_cloud_software/w/wiki/28536/the-model-appears-to-be-curved-instead-of-being-horizontal-after-at
These perturbations(worhmoles) appear where the accuracy of model is lower than thickness of the wall or fence. Easy way is to use Ultra accuracy settings in reconstruction but it is not reasonable for large models.
Also try "high density" option in aeortriangulation it could help to drop some lower accuracy points. "Legacy engine" preset also may work better.
Juan Polanco said:For example, with another program (trial) with the same imagery
STFM softwares are rapidly evolving so better algorithms can give better results in some cases.