north: North arrow

In terra: Spatial Data Analysis

North arrow

Description

Add a (North) arrow to a map

Usage

north(xy=NULL, type=1, label="N", angle=0, d, head=0.1, xpd=TRUE, ...)

Arguments

xy	numeric. x and y coordinate to place the arrow. It can also be one of following character values: "bottomleft", "bottom", "bottomright", topleft", "top", "topright", "left", "right", or NULL
type	integer between 1 and 12, or a character (unicode) representation of a right pointing arrow such as "\u27A9"
label	character, to be printed near the arrow
angle	numeric. The angle of the arrow in degrees
d	numeric. Distance covered by the arrow in plot coordinates. Only applies to type=1
head	numeric. The size of the arrow "head", for type=1
xpd	logical. If TRUE, the scale bar or arrow can be outside the plot area
...	graphical arguments to be passed to other methods

Value

none

See Also

sbar, plot, inset

Examples

f <- system.file("ex/meuse.tif", package="terra")
r <- rast(f)
plot(r)
north()
north(c(178550, 332500), d=250)

## Not run: 
f <- system.file("ex/elev.tif", package="terra")
r <- rast(f)
plot(r, type="interval")
sbar(15, c(6.3, 50), type="bar", below="km", label=c(0,7.5,15), cex=.8)
north(type=3, cex=.8)
north(xy=c(6.7, 49.9), type=2, angle=45, label="NE")
north(xy=c(6.6, 49.7), type=5, cex=1.25)
north(xy=c(5.5, 49.6), type=9)
north(d=.05, xy=c(5.5, 50), angle=180, label="S", lwd=2, col="blue")


## all arrows
r <- rast(res=10)
values(r) <- 1
plot(r, col="white", axes=FALSE, legend=FALSE, mar=c(0,0,0,0), reset=TRUE)
for (i in 1:12) {
	x = -200+i*30
	north(xy=cbind(x,30), type=i)
	text(x, -20, i, xpd=TRUE)
}


## End(Not run)

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