lidR (version 3.1.1)

filters: Predefined point of interest filters

Description

Select only some returns

Usage

filter_first(las)
filter_firstlast(las)
filter_firstofmany(las)
filter_ground(las)
filter_last(las)
filter_nth(las, n)
filter_single(las)

Arguments

las

An object of class LAS

n

the position in the return sequence

Value

An object of class LAS

Details

• filter_first Select only the first returns.

• filter_firstlast Select only the first and last returns.

• filter_ground Select only the returns classified as ground according to LAS specification.

• filter_last Select only the last returns i.e. the last returns and the single returns.

• filter_nth Select the returns from their position in the return sequence.

• filter_firstofmany Select only the first returns from pulses which returned multiple points.

• filter_single Select only the returns that return only one point.

See Also

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Other filters: filter_duplicates(), filter_poi(), filter_surfacepoints()

Examples

# NOT RUN {
LASfile <- system.file("extdata", "Megaplot.laz", package="lidR")
lidar = readLAS(LASfile)

firstReturns  = filter_first(lidar)
groundReturns = filter_ground(lidar)
# }