I am a surveyor for a government entity that is researching the possibilities of scanning some of the tunnels we have. One of my engineers asked what I thought the cost would be to scan one of our tunnels and I was a bit lost on a good price. So I thought I would come here and ask that question.
To all the surveyors that have done some 3D scanning, especially of tunnels, could you give me a ballpark idea of what the cost would be to scan a tunnel 20 foot pipe that is approximately 1 mile long, and have it done in 3 days.
I'm just looking for a ball park idea.
Thanks everyone.
two questions must be asked...
1) what accuracy
2) what resolution
And, will the interior tunnel surface be dry?
And 3; how long is the tunnel and will there be traffic?
You might look into driving through with Riegl Lidar...
" a tunnel 20 foot pipe" I'm not sure but this sounds like a 20' dia pipe - if that were the case then you probably don't need a scan so... maybe...
And 4: How irregular is the surface of the tunnel?
If it's via static scan methods then a smooth tunnel requires quite a few less setups than a highly irregular surface like in a hard rock tunnel.
And 5: What is the surface at the bottom of the tunnel?
Railroad tracks, a gravel bottom stream, a road, collapsed rubble, quicksand!
And 6: Is it near level or is there a lot of grade?
And 7: Do you want all surfaces scanned or are you looking for clearance info or ???
And 8: What is the deliverable?
DRY, smooth surfaced level tunnel not black with paved bottom, no traffic, easy access - can drive a vehicle in it, nearly level, 65d F, light breeze, and delivering a pile of unedited points is the lowest cost. Complicating factors and processing send the price upward.
I??d say somewhere around 15-20k to scan and set all the control. ?ÿI??d drive it if possible. ?ÿWe run both static and mobile scanners. ?ÿUsing a Leica mobile system mounted on an ATV would work if it??s not a roadway tunnel. ?ÿYou should be around plus or minus 0.02?? HV.?ÿ
I didn't think of using an ATV, good idea.
Thank you everyone for your comments. We were shut down due to costs; however, we will be working on this in the fall. Your questions are all great and thank you for the cost estimate too.
Just for those that were wondering, it is a water pipe/siphon that is about 1 mile long and about 20 feet in diameter, and metal with a coating. There is only a little bit of water at the bottom when it is decommissioned for maintenance. No vehicles, besides maybe an ATV, can get into either end and there are some major grade changes that wouldn't be able to be done with most vehicles.
?ÿ