as.lines: Conversion to a SpatVector of lines
In terra: Spatial Data Analysis

as.lines

R Documentation

Conversion to a SpatVector of lines

Description

Conversion of a SpatRaster, SpatVector or SpatExtent to a SpatVector of lines.

Usage

## S4 method for signature 'SpatRaster'
as.lines(x)

## S4 method for signature 'SpatVector'
as.lines(x)

## S4 method for signature 'SpatExtent'
as.lines(x, crs="")

## S4 method for signature 'matrix'
as.lines(x, crs="")

Arguments

`x`	SpatRaster, SpatVector, SpatExtent or matrix. If `x` is a matrix it should have two columns for a single line, or four columns, where each row has the start and end coordinates (x, y) for lines
`crs`	character. The coordinate reference system (see `crs`)

Value

SpatVector

Examples

r <- rast(ncols=2, nrows=2)
values(r) <- 1:ncell(r)

as.lines(r)

as.lines(ext(r), crs=crs(r))

if  (gdal() >= "3.0.0") {
	p <- as.polygons(r)
	as.lines(p)
}


## with a matrix
s <- cbind(1:5, 1:5)
e <- cbind(1:5, 0)

as.lines(s)
as.lines(cbind(s, e), "+proj=longlat")

terra documentation built on Oct. 14, 2024, 5:07 p.m.