[pdal] filtering duplicate points

[Andrew Cunliffe]

Dear all,

I am hoping someone might be able to help me to use PDAL to filter for
duplicate points in a point cloud.

By duplicate, I mean points that are less than a threshold distance (e.g.
0.001 m) from other points in the cloud. I'm working with
photogrammetrically-generated point clouds, in some cases ca. 20-30% of the
points are 'duplicates' so removing these has some big benefits later in
the pipeline.

I'm looking for a filter that functions like 'Remove duplicate points
<https://www.cloudcompare.org/doc/wiki/index.php?title=Remove_duplicate_points>'
in CloudCompare. I wasn't able to see anything suitable under the filters >
cull documentation, unless filters.voxelcenternearestneighbor would achieve
this with cell set to 0.001?

If anyone else thinks that a filter.duplicate function might be helpful,
I'm happy to submit a feature request via Github.

Thanks
Andy

-- 
Dr Andrew Cunliffe

Research Fellow
School of Geography
University of Exeter
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