Notifications
Clear all

3d Laser Scanning for Survey

19 Posts
9 Users
0 Reactions
3 Views
(@leegreen)
Posts: 2195
Customer
Topic starter
 

Currently working on a few very large BIM projects, where I have had to let the scanning go to others who are not land surveyors. I see them scanning with no spheres, no targets and no survey control. Just wondering about their accuracy. I'm sure I'll be asked at some point to verify their data when things don't fit.

Soon they will need Floor Flatness, Steel Deflections, and As-Built of sleeves.

My past year has been my best revenue to date, therefore my year-end purchase will be a Faro Focus S150+.

?ÿ

This should go well with my arsenal of tools which include:

Robotic Total Station (1")

Digital level

GNSS Receivers (6)

Global Mapper w/ Lidar

Microstation w/ TopoDot

Drones w/ Pix4D

?ÿ

Any of you using the Faro Focus S150+ or similar??ÿ?ÿ

?ÿ

 
Posted : December 19, 2020 7:56 am
(@totalsurv)
Posts: 797
Registered
 

I haven't used Faro but have used Leica P40 and RTC360. Dual axis compensator is a must in my opinion. The RTC360 doesn't have one and its a shame because it's so fast. Make sure the Faro has one.

What scanner were they using. If it's Leica P40 you can traverse with it, which they may have been doing with some cloud to cloud registration as well.

 
Posted : December 19, 2020 8:20 am
(@leegreen)
Posts: 2195
Customer
Topic starter
 

The Faro S150+ has

  • Dual Axis Compensator Performs -?ÿ leveling of each scan with an accuracy of 19 arcsec valid within ?ñ2?ø
  • On-Board electronic compass - gives the scan an orientation
  • GNSS Integrated GPS & GLONASS - L1 for approx. locations

I'm told that with a Windows Tablet or a PC I can perform near-real-time register of scans in the field. The Scene software downloads the scan via wi-fi and begins registration.?ÿ

?ÿ

The techs I saw were scanning with an RTC360.

?ÿ

In the past, I have done training with local Police agencies using total stations for fatal scenes. I would to provided 3d scan services. Anyone doing this?

 
Posted : December 19, 2020 10:19 am
(@antcrook)
Posts: 278
Customer
 

I just purchased the Trimble X7 which uses Trimble's Perspective field software to auto registers the scans in the field. It works well if you have enough common points/planes. The main reason I went with the X7 is that it does not need to be sent in for yearly calibration as it self-calibrates each time it does a scan. Extracting the data is a bit time consuming though.?ÿ

 
Posted : December 19, 2020 12:27 pm
(@leegreen)
Posts: 2195
Customer
Topic starter
 

Are you using TNC to process the point cloud?

Early this year I upgraded my PC to an AMD 32 core w/ 128GB for Pix4d drone processing. Just found out TBC doesn't work on AMD.

Faro Scene software takes advantage of 32 cores, as does Pix4d.?ÿ

 
Posted : December 19, 2020 1:24 pm
(@antcrook)
Posts: 278
Customer
 

I am using TBC on an Intel machine to process the scans.?ÿ

 
Posted : December 19, 2020 1:57 pm
(@stlsurveyor)
Posts: 2490
Registered
 

I have used Leica, Trimble, Reigl, Optech and Faro scanners. Faro are my least favorite. Easy to use but the Faro scanners I have used required scans to be georeferenced after the fact. Faro Scene sucks when compared to others. I suggest you save yourself and get a gently used Leica scanner.?ÿ

0.02

 
Posted : December 19, 2020 2:03 pm
(@totalsurv)
Posts: 797
Registered
 

@leegreen Using an RTC360 without control points is a disaster, rarely does the IMU give you level enough scans.

 
Posted : December 19, 2020 2:27 pm
(@leegreen)
Posts: 2195
Customer
Topic starter
 

@stlsurveyor

Trouble is this hospital project will be 170ft climb up stairs and ladders with gear. Those older Leicas appear a bit bulky. I just need the point cloud from Scene. Can do the rest in TopoDot. I have read that Faro software does crap out with large coordinates such as SPC. I put my BIM projects on Local coordinates with project north matching what is delivered from Revit.

 
Posted : December 19, 2020 2:49 pm
(@stlsurveyor)
Posts: 2490
Registered
 

@leegreen In that situation then I would suggest renting it and testing it out. Leica BLK 360 may be a good option as well. From experience though, the FARO is not a "Civil Applications" scanner. It does well though for interior BIM scans, but falls on its face quickly when being used for civil scans.

 
Posted : December 20, 2020 5:13 am
(@beuckie)
Posts: 346
Registered
 

forget on board registration. This works with a small amount of scans. When things get complicated it will mess up. Also never trust the registration, check in office through slices. Scene can give all greens but completely mess up.

I do all scanning with a Riegl Vz400i. a costly scanner but imho the best around. Scans bloody fast. Indoors use a trolley as it's heavy but the data is sweet.

And forget about the blk360. It's a toy!

 
Posted : December 20, 2020 8:20 am
(@leegreen)
Posts: 2195
Customer
Topic starter
 

@stlsurveyor

Hmm, have to think about that. I try to get a demo. Not if they will travel with Covid raging.

 
Posted : December 20, 2020 12:06 pm
(@jaccen)
Posts: 445
Registered
 

@leegreen

?ÿ

Just found out TBC doesn't work on AMD.

?ÿ

Sorry??ÿ Won't take advantage of all the cores or won't work........at all??ÿ?ÿ

 
Posted : December 20, 2020 8:10 pm
(@totalsurv)
Posts: 797
Registered
 

@beuckie Agree on the blk. It is rubbish.

 
Posted : December 20, 2020 11:56 pm
(@leegreen)
Posts: 2195
Customer
Topic starter
 

@jaccen

Won't work at all.?ÿ Install fails.

 
Posted : December 21, 2020 12:02 am
(@bill93)
Posts: 9834
 
Posted by: @leegreen
Just found out TBC doesn't work on AMD.

I suspect it isn't due to it being AMD specifically but rather that after the upgrade the machine has a different computer identification. Is the failure message any different than if you tried to install on too many machines?

 
Posted : December 21, 2020 6:27 am
(@jitterboogie)
Posts: 4275
Customer
 

We use an SX10 and I haven't had any issues other than the failure after rhe vendor calibrated it for us.

It's sold as a 1" gun and when we do full registered scans use anything in the cloud to pic points that give us 2-3 hundreds in accuracy and precision which ends up being still better than they can build it to.

Not Holloman Test track perfect but straight forward and solid for 3D line work and civil 3D and on to revit and infraworks.

And the cost is not bad considering.

 
Posted : December 21, 2020 7:44 am
(@lee-d)
Posts: 2382
Registered
 

I seem to remember that there is a known (to Trimble) issue with TBC and AMD processors.

 
Posted : December 21, 2020 9:46 am
(@lee-d)
Posts: 2382
Registered
 

I've done a couple of jobs with the Trimble X7; in both cases there were some issues with the auto registration but they were easy to clean up, I only had to change which scans were registering to which other scans.

They're coming out, if they haven't already, with a new version of Perspective that allows in the field georeferencing and I believe also improves the auto registration.

 
Posted : December 21, 2020 9:49 am