Messages

1

General / Re: Anomalous points below ground surface

« on: July 01, 2017, 02:42:49 AM »

Thanks again Alexey that did the trick. There are still a couple of noise points that didn't get classified, but overall the DTM looks a lot better!

2

General / Re: Anomalous points below ground surface

« on: June 30, 2017, 09:52:33 PM »

Thanks Alexey, I'll give that shot

3

General / Re: Anomalous points below ground surface

« on: June 29, 2017, 06:20:00 PM »

Thanks Toffersan! I've worked with cloud compare before and will give the noise filter a shot. Is there any specific parameters you'd recommend?

4

General / Re: Camera Elevation AGL Ground Control Points Above Sea Level

« on: June 29, 2017, 01:15:53 AM »

The elevation for your ground control points should over ride those from your P4. I've been running models using the same method without a problem.

5

General / Re: Analyzing Point Clouds

« on: June 29, 2017, 01:10:41 AM »

Agreed. Cloud compare is awesome and I've used it alot to compare point clouds from agisoft vs. lidar.

6

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?