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Contour of a point cloud

Source: R/stages.R
hulls.Rd

This stage uses a Delaunay triangulation and computes its contour. The contour of a strict Delaunay triangulation is the convex hull, but in lasR, the triangulation has a max_edge argument. Thus, the contour might be a convex hull with holes. Used without triangulation it returns the bouding box of the points.

Usage

hulls(mesh = NULL, ofile = tempgpkg())

Arguments

mesh

NULL or LASRalgorithm. A triangulate stage. If NULL take the bounding box of the header of each file.

ofile

character. Full outputs are always stored on disk. If ofile = "" then the stage will not store the result on disk and will return nothing. It will however hold partial output results temporarily in memory. This is useful for stage that are only intermediate stage.

Value

This stage produces a vector. The path provided to `ofile` is expected to be `.gpkg` or any other format supported by GDAL. Vector stages may produce geometries with Z coordinates. Thus, it is discouraged to store them in formats with no 3D support, such as shapefiles.

See also

triangulate

Examples

f <- system.file("extdata", "Topography.las", package = "lasR")
read <- reader()
tri <- triangulate(20, filter = keep_ground())
contour <- hulls(tri)
pipeline <- read + tri + contour
ans <- exec(pipeline, on = f)
plot(ans)