CloudCompare forum

Posted: **Thu Apr 09, 2020 1:18 pm**

Hi!
I have made point cloud from historical satellite images (Corona), but there are different size of "noises" with extreme low height values (because of cloudiness). I tried noise filtering feature, but the result is quite similar to original point cloud and noises still exist. I tried filtering with 15, 30, 50 and 100m radius. Image resolution is 2m. Maybe someone can help?
Kriss

Posted: **Thu Apr 09, 2020 4:56 pm**

Could you post a snapshot of your point cloud maybe?

Posted: **Thu Apr 09, 2020 8:51 pm**

Yes, so this is how point cloud and DEM looks:

: DEM.PNG (299.63 KiB) Viewed 9999 times

The attachment DEM.PNG is no longer available

Posted: **Thu Apr 09, 2020 8:52 pm**

: Point cloud.PNG (352.76 KiB) Viewed 9999 times

Posted: **Fri Apr 10, 2020 8:36 pm**

And where is the noise? Can you show the cloud from the side maybe?

Posted: **Fri Apr 10, 2020 10:44 pm**

Hope you can understand from this - on the right side are negative values.

: side.PNG (15.66 KiB) Viewed 9937 times

Posted: **Sun Apr 12, 2020 5:32 pm**

Hum, I fear the noise is too dense and 'attached to the cloud'...

You could of course remove the points with negative Z easily, but I bet it's not that easy?

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