dhirota wrote: ↑Sun Aug 20, 2023 11:38 pm
This is an interesting thread to try and figure out what the rest of the scanning world is accomplishing for their clients. I am not sure if the group not cleaning their scans are using only the point clouds for an intermediate process to finish into a BIM or multimedia mode where color and trash within the scan may not be as relevant to clients.
It comes down to client requirement and final deliverables in my experience
Quite a bit of the work I do is in rail, where there simply isn't the same amount of temporary occlusion as you'd see on roads. Typically, static scanning would be taken from both sides of the track as one of the primary features of interest is the track running edge, which is only ever partially visible from one side. Other items of interest are clearance of locomotive and carriage (kinematic envelope) particularly to gantries, and height and stagger distances to overhead lines for electrification. Some visualization is always nice but scanning is also often accompanied by high res drone photography for more in-depth track condition analysis.
Intensity is also often more important than colour on the urban road surveys that I get as these are typically done at night. The reason for this is that capturing top and bottom of kerbs along with roadside pavement condition is very important and this is best done when there are a minimum of parked cars about. Also far fewer people and moving cars from the point of view of cleaning.
Any motorway jobs I've been involved in tend to be scanned using mobile mapping across multiple passes, where automatic moving object elimination works well. Automatic classification also works well in this environment, way better than in urban road scenarios.
For topographic volumes and DTM extraction, automated ground classification works a treat, so once again, manual cleaning isn't typically needed.