Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Show only
|
Search instead for
Did you mean:
This page has been translated for your convenience with an automatic translation service. This is not an official translation and may contain errors and inaccurate translations. Autodesk does not warrant, either expressly or implied, the accuracy, reliability or completeness of the information translated by the machine translation service and will not be liable for damages or losses caused by the trust placed in the translation service.Translate
With more and more projects using drone or laser surveying, it would be great to project a point cloud on section views. We don’t always need only the surface from a point cloud but rather the surface features as well (i.e. existing bridges, buildings and vegetation heights).
I realize AutoCAD can attempt to create a point cloud section, but the workflow is disconnected from our typical Civil 3D section views.
Having recently done some work in this area, it's not as simple as it might appear. First the data needs to be classified into the standard Lidar classes. From what I've seen, drones can pick up color but not properly classify the data, and those colors can vary so significantly at slightly different angles it's really hard to classify by color.
Then of course is the absence of data. Say for example a building roof is picked up and put in the proper location but without ground points that happen to be at the edge of the walls where they meet the ground, there is nothing to force the sectional figure back to the ground. You end up with a floating (near horizontal) plane (the roof) and no | | wall drops.
I was thinking more along the line of projecting a slice of points (granted the points are contained together) on the section view. The screen shot you have shows lines that are generated from the points, hence I see the reason for classification! But I propose projecting points as they are, wherever they are!
Even though Lidar is dense, there is the possibility that no points lie on the actual sample line, you have to have a corridor width parameter and project those points to the line. Too narrow a parameter and you don't get enough points for consideration, too wide and you end up with points that maybe should not have been considered, causing a jagged path that would otherwise have been straight.
We're also working at trying to generate overhangs in sections, which is something that isn't possible in sections from TinSurfaces. Definitely presents some obstacles.
