catalog_boundaries: Computes the polygon that encloses the points

In lidR: Airborne LiDAR Data Manipulation and Visualization for Forestry Applications

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 st_concave_hull 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, ...)

Arguments

ctg	A LAScatalog
...	propagated to st_concave_hull

Value

A LAScatalog with true boundaries

Non-supported LAScatalog options

The options 'select', 'output files', 'chunk size', 'chunk buffer', 'chunk alignment' are not supported and not respected in 'catalog_boundaries*' because the function must always process by file, without buffer and knows which attributes to load.

Examples

LASfile <- system.file("extdata", "Megaplot.laz", package="lidR")
ctg <- readLAScatalog(LASfile, filter = "-drop_z_below 0.5")
ctg2 <- catalog_boundaries(ctg, concavity = 1, length_threshold = 15)
plot(ctg)
plot(ctg2, add = TRUE)

lidR documentation built on Sept. 8, 2023, 5:10 p.m.