lines: Add points, lines, or polygons to a map

In terra: Spatial Data Analysis

Add points, lines, or polygons to a map

Description

Add a vector geometries to a plot (map) with points, lines, or polys.

These are simpler alternatives for plot(x, add=TRUE)

These methods also work for a small(!) SpatRaster. Only cells that are not NA in the first layer are used.

Usage

## S4 method for signature 'SpatVector'
points(x, col, cex=0.7, pch=16, alpha=1, ...)

## S4 method for signature 'SpatVector'
lines(x, y=NULL, col, lwd=1, lty=1, arrows=FALSE, alpha=1, ...)

## S4 method for signature 'SpatVector'
polys(x, col, border="black", lwd=1, lty=1, alpha=1, ...)

## S4 method for signature 'SpatRaster'
points(x, ...)

## S4 method for signature 'SpatRaster'
lines(x, mx=10000, ...)

## S4 method for signature 'SpatRaster'
polys(x, mx=10000, dissolve=TRUE, ...)

## S4 method for signature 'SpatExtent'
points(x, col="black", alpha=1, ...)

## S4 method for signature 'SpatExtent'
lines(x, col="black", alpha=1, ...)

## S4 method for signature 'SpatExtent'
polys(x, col, alpha=1, ...)

Arguments

x	SpatVector or SpatExtent
y	missing or SpatVector. If both x and y have point geometry and the same number of rows, lines are drawn between pairs of points
col	character. Colors
border	character. color(s) of the polygon borders. Use NULL or NA to not draw a border
cex	numeric. point size magnifier. See par
pch	positive integer, point type. See points. On some (linux) devices, the default symbol "16" is a not a very smooth circle. You can use "20" instead (it takes a bit longer to draw) or "1" for an open circle
alpha	number between 0 and 1 to set transparency
lwd	numeric, line-width. See par
lty	positive integer, line type. See par
arrows	logical. If TRUE and y is a SpatVector, arrows are drawn intead of lines. See ?arrows for additional arguments
mx	positive number. If the number of cells of SpatRaster x is higher, the method will fail with an error message
dissolve	logical. Should boundaries between cells with the same value be removed?
...	additional graphical arguments such as lwd, cex and pch

Examples

 
f <- system.file("ex/lux.shp", package="terra")
v <- vect(f)

r <- rast(v)
values(r) <- 1:ncell(r)
plot(r)
lines(v)
points(v)

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