[pdal] filtering duplicate points

[Michael Smith]

Andrew,

 

You can use filters.sample and just set a small radius.

 

Mike

 

 

-- 

Michael Smith

Remote Sensing/GIS Center

US Army Corps of Engineers

 

 

From: pdal <pdal-bounces at lists.osgeo.org> on behalf of Andrew Cunliffe <andrewmcunliffe at gmail.com>
Date: Monday, May 13, 2019 at 8:21 AM
To: PDAL Mailing List <pdal at lists.osgeo.org>
Subject: [pdal] filtering duplicate points

 

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' 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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