How to create a catalog from LAS file in a directory with filter [closed]

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With lidR package, how can I create a catalog with a filter keep_first for example?

JRR · Accepted Answer · 2019-11-27 15:23:06Z

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ctg = readLAScatalog("folder")
opt_filter(ctg) <- "-keep_first"

Whenever you will process this catalog (either with lidR functions or catalog_apply), only the first returns will be read.

answered Nov 27, 2019 at 15:23

JRR

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thanks a lot for this explaination.
– Pascal Obstétar
Commented Nov 27, 2019 at 16:08
Please mark the question answered (and also this one gis.stackexchange.com/questions/342578/…)
– JRR
Commented Nov 27, 2019 at 19:16

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