remove_small_trees: Remove small clusters from segmented point cloud

In crownsegmentr: Tree Crown Segmentation in Airborne LiDAR Point Clouds

Remove small clusters from segmented point cloud

Description

The function takes a point cloud in which trees were segmented, and removes tree clusters that are smaller than a certain radius or a certain height

Usage

remove_small_trees(
  point_cloud,
  min_radius = 1,
  min_height = -Inf,
  crown_id_column_name = "crown_id"
)

## S4 method for signature 'data.frame'
remove_small_trees(
  point_cloud,
  min_radius = 1,
  min_height = -Inf,
  crown_id_column_name = "crown_id"
)

## S4 method for signature 'LAS'
remove_small_trees(
  point_cloud,
  min_radius = 1,
  min_height = -Inf,
  crown_id_column_name = "crown_id"
)

## S4 method for signature 'LAScatalog'
remove_small_trees(
  point_cloud,
  min_radius = 1,
  min_height = -Inf,
  crown_id_column_name = "crown_id"
)

Arguments

point_cloud	a point cloud, either as data.frame/data.table, or as lidR::LAS object.
min_radius	(Numeric >= 0) the threshold for crown radius, below which trees will be removed
min_height	(Numeric) the threshold for crown height, below which trees will be removed. Works only if las is normalized.
crown_id_column_name	the name of the column in which the id of the crown is saved

Value

lidR LAS

Functions

• remove_small_trees(data.frame): removes small tree clusters in a segmented LAS object.

• remove_small_trees(LAS): removes small tree clusters in a segmented LAS object.

• remove_small_trees(LAScatalog): removes small tree clusters in a segmented LAScatalog.

Details

returns the same las object that was given as input, but with altered crown id's. Trees that are considered too small have their crown id set to NA, and all other crown id's are re-assigned so that they are without gaps

crownsegmentr documentation built on Sept. 22, 2026, 5:09 p.m.