Hi people!
Just a short introduction. I'm studying to become a surveyor in Sweden and I'm almost done. However, first I have to write an essay and I decided to got for a point cloud scan I made in a cave. I will try to explain how to link projects together into one big point cloud through registering in TBC
Now, the process is more or less automatic as long as I give TBC a couple of common points. However, in this essay I need to go slightly deeper and give some more technical info. TBC doesn't tell me much, apart from "residual error" and "overlap", but I think that is enough. The problem is: I don't know what these mean.
I've tried to search for information, but the explanations are at a too advanced level for me (and for my essay). I'm just wondering if someone is willing to give me a simplified explanation of these two parameters.
Note: I would like to use Realworks but I wasn't able to get a hold of a license so I have to stick to TBC.
Student needs help - residual error and overlap
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Re: Student needs help - residual error and overlap
Hello and welcome.
Use the search function, Daniel Wujanz posted some great write-ups that might be what you're after.
Use the keyword taming errors
This is a grossly oversimplified explanation:
Overlap = how much of a scan, or group of scans can be seen from a different scan. The commonality between these allows ICP algorithms to find the solution to register different scans together.
Residual = How far those points that are in the overlap region deviate from the ideal placement to achieve a perfect registration.
All things being equal, the more overlap you have, the lower the residual value, again, grossly over simplifying this.
Use the search function, Daniel Wujanz posted some great write-ups that might be what you're after.
Use the keyword taming errors
This is a grossly oversimplified explanation:
Overlap = how much of a scan, or group of scans can be seen from a different scan. The commonality between these allows ICP algorithms to find the solution to register different scans together.
Residual = How far those points that are in the overlap region deviate from the ideal placement to achieve a perfect registration.
All things being equal, the more overlap you have, the lower the residual value, again, grossly over simplifying this.
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Re: Student needs help - residual error and overlap
Dear Snobbias,
as Domo mentioned (thanks for that), here are the links to the articles in question. If you need more scientific explanations or have deeper questions, just send me a pm.
https://www.linkedin.com/pulse/taming-e ... ap-wujanz/
https://www.linkedin.com/pulse/taming-e ... el-wujanz/
All the best
Daniel
as Domo mentioned (thanks for that), here are the links to the articles in question. If you need more scientific explanations or have deeper questions, just send me a pm.
https://www.linkedin.com/pulse/taming-e ... ap-wujanz/
https://www.linkedin.com/pulse/taming-e ... el-wujanz/
All the best
Daniel
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Re: Student needs help - residual error and overlap
Thank you both for your help. I actually came across "Taming errors" a few weeks ago and I haven't been able to find any deeper analysis of residual error as of yet. The problem is I lack the knowledge to understand your articles. I will however reference them in my essay for those who are interested in going deeper.
@MajorDomo, your definition is fine for me.
@MajorDomo, your definition is fine for me.
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Re: Student needs help - residual error and overlap
If you are not sure how to interpret something, you can also simply ask. I will send you my email address in a pm.
Cheers
Daniel
Cheers
Daniel