What kind of cost would be involved in scanning a 5 mile long light rail corridor with 5 bridges 3 sizable box culverts w/headwalls, and about a half mile of roadway paving running parallel in one area? Maybe a combination of mobile and terrestrial. Control network already in place with points every 200' in anchor bolts in center of the guideway. data to be used for as-builts. I am not price shopping rather than seeing if it would be feasible before exploring it further.
Thanks
The main difficulty is the amount of data to be stored for that length of project. The computer has to be capable of working with huge databases.
The Transportation Research Board has a PDF that has some broad basics of the requirements to successfully scan and produce working files.
http://www.trb.org/Main/Blurbs/169111.aspx
It really depends on the amount of detail that the client needs. If a lot then scanning is the way to go. But utilities etc. may need to be shot separately. Since it is all 'line of sight' ditches, and flat manholes and valves will not be picked up directly.
We use it to shoot bridges and soffits a lot. Also the approach slabs to locate bird-baths, etc. Accuracy is as good as a TS. Just keep the shots within a reasonable distance (100M to 125M) for hard surfaces.
Most of your cost would be in feature extraction. It would vary quite a bit based on what specific features you want. The scanning itself would probably be in the $30k-50k range. Maybe less depending on mobilization costs.
