Good morning,
I would like to merge 2 datasets, 1 set obtained by drone and 1 obtained by laser scanner. I have only one problem, the drone set is crooked, I entered the gpc but when I combine the two components the laser cloud adapts to the drone cloud and not vice versa. I’ll leave some screens to make me understand better, I don’t know where I’m going wrong.
I would like the laser le cloud to stay stuck, as I’m sure the alignment is right.
Do you have any suggestions? A thousand thanks
1 Like
Hi TNT_Yois,
are your data georeferenced?
If you need it in lase scan coordinate system then turn off georeferencing for images (select all images in 1Ds view and set their position as Unknown). After that align your datasets again.
But also drone dataset shouldn’t be crooked. Are you using GCPs or just CPs (control points)?
Hi, the laser scanner data is not georeferenced, instead the drone data is georeferenced. To align the drone data alone I did not use GCP or CP, but the photos are georeferenced. To merge the laser and cloud data I placed the CPs on the laser scanner cloud and then on the laser cloud. The laser data shouldn’t be crooked but I don’t know if it depends on the gps accuracy, the drone in question is the parrot anafi. They indicated to me that before exporting the drone component I have to redo the alignment using only the gcp measured on site, which is why the cloud is crooked. However, I also solved it by selecting all the photos of the drone component and in the pose priority tab > absolute pose > I entered unknown.
Thank you very much, I will do various tests to try what changes.
Did you manage to fix it? I’m facing a similar situation—drone with georeferencing and 3 LiDAR scans, but I can’t merge the two components. I tried using control points (used 3), and it never merges.
Hi @MathewGF,
how are the control points placed on laser scans? Are they on at least two LSPs?
Also, you have three scans, but only 5 LSPs. Are the laser scans cut?
Hi yes, I managed to solve it this way:
- in the drone photo settings I set unknown to absolute pose, I don’t have an rtk drone and the photo coordinates are not very precise.
- in the scanner scan settings I set locked to absolute pose, because the alignment of the laser scans was done via the instrument software.
- I positioned the gcp to help the drone cloud connect to the laser cloud.
ps. from what I understand the final result of the cloud is given by an elaboration of the photos processed together with the laser scans and not the elaboration of the photos overlapped with the laser scans. For this reason your gcp must be homogeneous throughout the cloud.
OndrejTrhan correct me if I’m wrong but so far this is for me the best solution to make the drone cloud match the laser cloud.