Not sure of my topic choice, but....
Mr. Spledeus's thread below about point cloud software got me to thinking.
First question, is any of this stuff 3D? I know [pretty sure] the scanners can't see through walls and such ... BUT imagine this:
You're doing street work as spledeus says and scanning along getting all the building faces and such.
What happens when any of these structures has a door or window open and the scanner "sees" a wall that's say 20' back from the building face?
What about an open door with a staircase right behind it?
I would imagine the software should allow for exclusion "globs" for lack of a better word. Similar to doing contour line drawing and marking a building as being excluded from that contouring algorithm data set.
Otherwise you might end up with something that looks like it's trying to be 3D.
I'm just musing. Don't hurt me too bad. I've already been set straight about what I thought a scanner couldn't do. Like I said before I've never seen one in real-life - just on TV documentaries and they had nothing to do land surveying, just murder scenes and stuff.
E
If it's in view and range you pick it up. Filtering/clean up is up to the user. Speed with data extraction and clean-up is the real trick.
I work for a DOT. We scan the roadways and highways. As such we get a lot of trucks and cars that wiz by during a scan. This leaves us with a lot of "rain" in the scan. The trick is to find the surface and use it as the benchmark to weed out the rain. Takes some learning to find the right combination of techniques, but usually get a nice clean surface when its done.
I am currently working on a fly-by video of a post construction wall scan we did. This is for presentation purposes. I'll post a link for it in a day or two.
Lidar scan
The link below has a fly-over video of a scan we did to monitor subsidence. The area between the wall and the building was getting jacked with pressure buildup from what we believe was the freeway surcharge - for lack of a better term. Caissons and retaining walls were placed along the whole length of the building to counteract the stress.
So far it's holding.
Lidar scan
Lidar scan
You nailed it!
😀
Located near the I5/73 split in San Juan Capistrano.
This area is loaded with adobe clay and is known for earth shifts.
Lidar scan
I went looking for the location because of a question that arose about the video, but after posting the image I forgot about my question and went to bed.
So here's the question: In the video I see dark circles in what might be scanner setup locations. I can understand how the scanner would be unable to see directly beneath itself, but wouldn't those circles get filled in by scans from other setups? There appear to be ghostly images of tripods in those spots, as though a backsight setup was being picked up. So, what gives with the black circles?
Lidar scan
You're right - it is the scanner/backsite locations. The distance between the setups was near the limits of the C-10 and on a slight vertical curve. The circles were a result of being just out of range of each adjacent setup.
I left the tripod ghost images in because I wanted people to know it took someone (yours truly) to stand along the side of a busy freeway to get these shots.