Keeping Coordinates in Registration of two Point clouds

[Anonymous]

I have one coordinated point from a P40 scanner, and one uncoordinated point cloud from a BLK360 scanner. The scan areas overlap. I tried coordinating the BLK data using targets but it will not recognise the targets when I try to pick them. I also tried picking targets in the P40 data and this did not work either.

I then tried registering the uncoordinated BLK data to the coordinated P40 data. The registration worked but it did not keep the coordinates of the P40 data and instead became arbitrary.

How can I solve this issue? Is there a way to set a home scan world, or fix the coordinates of one of the scans?

Thanks

[miguelantunes1992]

Hello,

https://help.autodesk.com/view/RECAP/2018/ENU/?guid=GUID-76535CD1-8BBA-43CD-82F3-574B9B8B4D62

You have to unite the non georeferenced with the geo, never the opposite
Open the p40 scan project, regist the blk scan and then unite

Miguel Antunes

[Anonymous]

Hello,

Thank you for your reply.
I have already done as you suggested. I have brought my coordinated data
into Recap. I checked and it maintained its coordinates. I then imported
the uncoordinated point cloud into my coordinated RCP.
It allowed me to register the two datasets together. But once the two are
merged it loses its coordinates.
Do you know why this is the case?

Thanks,
Lorcan

[Anonymous]

Hello,

Thank you for your reply.

I have already done as you suggested. I have brought my coordinated data into Recap. I checked and it maintained its coordinates. I then imported the uncoordinated point cloud into my coordinated RCP.

It allowed me to register the two datasets together. But once the two are merged it loses its coordinates.

Do you know why this is the case?

Thanks,

Lorcan

[miguelantunes1992]

They merged correctly when you see the project?

[miguelantunes1992]

Go here, and save three points from the uncordinate scan then goback to the project, I think this result

[Anonymous]

Yes. It indicated that there was a good registration. Upon inspection it was in line with the original point cloud. However the coordinates were incorrect, they were now arbitrary.

Is there any way to adjust the settings in Recap? Maybe I can choose a scan to be the reference scan that will not move, or a way to fix the coordinates so they won't change in the main point cloud?

Thanks

[Anonymous]

Do you mean that I should choose targets in the uncoordinated scan? I can not get Recap to recognise the targets in either point cloud. One point cloud was recorded using a Leica P40 scanner (this is the coordinated data) the other recorded using a BLK360. It will not recognise the targets in either point cloud. I used standard leica 4.5 inch targets.

[miguelantunes1992]

I will make this:

Open the georeferenced scan  , import the non-geo , resume registration, merge,  and then choose 3 points in registration and save and the result is one project with the first coordinates

Sorry don't know 

[miguelantunes1992 · Accepted solution]

You don't have to chose a target

[Anonymous]

---

@miguelantunes1992 wrote:

I will make this:

Open the georeferenced scan  , import the non-geo , resume registration, merge,  and then choose 3 points in registration and save and the result is one project with the first coordinates

Sorry don't know 

---

Apologies I don't understand what you mean by "and then choose 3 points in registration and save..."

[miguelantunes1992]

see the picture

[Anonymous]

I have done as you suggested and I believe it is working, I still need to check the accuracy of the transformation but I think this has solved my issue.

Thank you very much for your assistance.

[miguelantunes1992]

No problem,

best luck for you