ggspatial (version 1.1.9)

annotation_north_arrow: Spatial-aware north arrow

Description

Spatial-aware north arrow

Usage

annotation_north_arrow(
  mapping = NULL,
  data = NULL,
  ...,
  height = unit(1.5, "cm"),
  width = unit(1.5, "cm"),
  pad_x = unit(0.25, "cm"),
  pad_y = unit(0.25, "cm"),
  rotation = NULL,
  style = north_arrow_orienteering
)
GeomNorthArrow

Value

A ggplot2 layer

Format

An object of class GeomNorthArrow (inherits from Geom, ggproto, gg) of length 5.

Arguments

mapping, data, ...

See Aesthetics

height, width

Height and width of north arrow

pad_x, pad_y

Padding between north arrow and edge of frame

rotation

Override the rotation of the north arrow (degrees conterclockwise)

style

A grob or callable that produces a grob that will be drawn as the north arrow. See north_arrow_orienteering for options.

Aesthetics

The following can be used as parameters or aesthetics. Using them as aesthetics is useful when facets are used to display multiple panels, and a different (or missing) scale bar is required in different panels. Otherwise, just pass them as arguments to annotation_north_arrow().

• which_north: "grid" results in a north arrow always pointing up; "true" always points to the north pole from whichever corner of the map the north arrow is in.

• location: Where to put the scale bar ("tl" for top left, etc.)

Examples

cities <- data.frame(
  x = c(-63.58595, 116.41214),
  y = c(44.64862, 40.19063),
  city = c("Halifax", "Beijing")
)

ggplot(cities) +
  geom_spatial_point(aes(x, y), crs = 4326) +
  annotation_north_arrow(which_north = "true") +
  coord_sf(crs = 3995)

ggplot(cities) +
  geom_spatial_point(aes(x, y), crs = 4326) +
  annotation_north_arrow(which_north = "grid") +
  coord_sf(crs = 3995)