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Is there a comprehensive list of string based filters that the lidR package supports in readLAS()? For example:

  • filter = "-drop_z_below 0"

  • filter = "-drop_withheld"

I know there are many more ...

4

Yes. The documentation of readLAS() gives you all the required information

Details

Filter: the filter argument allows filtering of the point cloud while reading files. [...] The available filters are those from LASlib and can be found by running the following command: rlas:::lasfilterusage(). (see also rlas::read.las)

So you can use rlas:::lasfilterusage()

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