lidR (version 3.2.3)

catalog_boundaries: Computes the polygon that encloses the points

Description

Computes the polygon that encloses the points. It reads all the files one by one and computes a concave hull using the concaveman function. When all the hulls are computed it updates the LAScatalog to set the true polygons instead of the bounding boxes.

Usage

catalog_boundaries(ctg, concavity = 5, length_threshold = 5)

Arguments

ctg

A LAScatalog

concavity

numeric. A relative measure of concavity. 1 results in a relatively detailed shape, Infinity results in a convex hull. You can use values lower than 1, but they can produce pretty crazy shapes.

length_threshold

numeric. When a segment length is under this threshold, it stops being considered for further detailed processing. Higher values result in simpler shapes.

Value

A LAScatalog with true boundaries

Supported processing options

Supported processing options for more details see the LAScatalog engine documentation:

• chunk size: Not supported, it processes by file.

• chunk buffer: Not supported, it processes by file with no buffer.

• chunk alignment: Not supported, it processes by file.

• progress: Displays a progress estimate.

• output files: Not supported, it returns an R object.

• select: Not supported, it loads XYZ only.

• filter: Read only the points of interest.

Examples

# NOT RUN {
LASfile <- system.file("extdata", "Megaplot.laz", package="lidR")
ctg <- readLAScatalog(LASfile, filter = "-drop_z_below 0.5")
ctg2 <- catalog_boundaries(ctg, 1, 15)
plot(ctg)
plot(ctg2, add = TRUE)
# }