voronoi: Voronoi tessellation

In adamlilith/fasterRaster: Faster Raster and Spatial Vector Processing Using 'GRASS GIS'

Voronoi tessellation

Description

This function creates a Voronoi tessellation from a set of spatial points or polygons.

Usage

## S4 method for signature 'GVector'
voronoi(x, buffer = 0)

Arguments

x	A GVector "points" object.
buffer	Numeric: By default, this function creates a vector that has an extent exactly the same as the input data. However, the apparent extent can be changed by setting this value to a value different from 0. Negative values reduce the size of the extent, and positive extend it. Units are in map units.

Value

A GVector.

See Also

terra::voronoi(), sf::st_voronoi(), module v.voronoi in GRASS

Examples

if (grassStarted()) {

# Setup
library(sf)

# Example vectors
madDypsis <- fastData("madDypsis") # points
madCoast4 <- fastData("madCoast4") # polygons

# Convert sf vectors to GVectors
dypsis <- fast(madDypsis)
coast4 <- fast(madCoast4)
ant <- coast4[coast4$NAME_4 == "Antanambe"]

# Delaunay triangulation
dypsisDel <- delaunay(dypsis)
plot(dypsisDel)
plot(dypsis, pch = 1, col = "red", add = TRUE)

# Voronoi tessellation
vor <- voronoi(dypsis)
plot(vor)
plot(dypsis, pch = 1, col = "red", add = TRUE)

# Random Voronoi tessellation
rand <- rvoronoi(coast4, size = 100)
plot(rand)

}

adamlilith/fasterRaster documentation built on Dec. 21, 2024, 2:04 a.m.