# NOT RUN {
LASfile <- system.file("extdata", "Topography.laz", package="lidR")
las <- readLAS(LASfile, select = "xyzrn")
ws <- seq(3,12, 3)
th <- seq(0.1, 1.5, length.out = length(ws))
las <- lasground(las, pmf(ws, th))
plot(las, color = "Classification")
# }
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