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I would like to have an idea about the classification of point clouds loaded in a LAScatalog with lidR. With a las file, I can do this way:

library(lidR)
LASfile <- system.file("extdata", "Megaplot.laz", package="lidR")
las <- readLAS(LASfile)
table(las$Classification)

How can I perform such queries with LAScatalog?

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  • You have to read the files to get these information. They are not stored in the header and are thus not accessible in a LAScatalog
    – JRR
    Feb 8, 2021 at 13:18

1 Answer 1

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You have to read the files to get these information. The header of a las file does not store a summary of the classification. Consequently a LAScatalog cannot access such information because it only reads the headers. You can loop through your files:

lapply(files, function(file) {
  las <- readLAS(files, select = "c")
  table(las$Classification)
})

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