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General / Anomalous points below ground surface
« on: June 29, 2017, 01:09:05 AM »
I've been running into a problem with random anomalous points in my dense point cloud. The point cloud is derived from images shot using a UAV. Looking from above the point cloud it looks great. But when you flip the point cloud and look below the ground surface there are numerous points aligned way below the surface. The point cloud is roughly 82 million points and I'm guessing there are 10s if not 100s of thousands of points below the ground surface. Not a big deal for the surface model, but when I run a ground classification these get included and make a really odd looking digital terrain model. The model ends up with big spikes dipping below the ground surface.
Has anyone else had this issue? Short of going through and erasing all of these is there a way to remove or avoid the problem?
Has anyone else had this issue? Short of going through and erasing all of these is there a way to remove or avoid the problem?
