[pdal] Filtering atmospheric noise

[Kirk Waters - NOAA Federal]

Is there any chance the points are marked as withheld? I've seen quite a
bit of data where bad points are marked as withheld but not marked as noise.

Kirk Waters, PhD
NOAA Office for Coastal Management
Applied Sciences Program
‪Phone: 843-284-6962‬ (New as of 2022)
coast.noaa.gov/digitalcoast




On Wed, Mar 9, 2022 at 4:45 PM Andreas Yankopolus <andreas at yank.to> wrote:

> All—
>
> I’m using USGS 3DEP point-clouds to generate surface-height rasters around
> Longmont, CO. The point-cloud files have spurious returns over many of the
> lakes/reservoirs in the area that are tagged other than 7 or 18. They’re
> streaks about 0.3 m long located 200+ m above the lake. In most cases the
> streak has 3–8 points, but I’ve found one with 34 points.
>
> The outlier filter with statistical or radius methods doesn’t remove these
> longer streaks. Any recommendations on removing dense groups of points well
> separated from the main mass?
>
> I’m having success with:
>
> {
>
> "type": "filters.outlier",
>
> "method": "radius",
>
> "radius": 16.0,
>
> "min_k": 64
>
> }
>
>
> This seems to do the trick of removing isolated groups while leaving the
> main body of points alone, but I’m thinking these some other dimension that
> could be calculated and added to points then used to remove outlier groups
> later.
>
> Cheers,
>
> Andreas
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