mf_graticule: Plot graticules

In mapsf: Thematic Cartography

Plot graticules

Description

Display graticules and labels on a map.

Usage

mf_graticule(
  x,
  col = col,
  lwd = 1,
  lty = 1,
  expandBB = rep(0, 4),
  label = TRUE,
  pos = c("top", "left"),
  cex = 0.7,
  add = TRUE
)

Arguments

x	object of class sf, sfc or SpatRaster
col	graticules and label color
lwd	graticules line width
lty	graticules line type
expandBB	fractional values to expand the bounding box with, in each direction (bottom, left, top, right)
label	whether to add labels (TRUE) or not (FALSE)
pos	labels positions ("bottom", "left", "top" and / or "right")
cex	labels size
add	whether to add the layer to an existing plot (TRUE) or not (FALSE)

Value

An (invisible) layer of graticules is returned (LINESTRING).

Use of graticules

From st_graticule: "In cartographic visualization, the use of graticules is not advised, unless the graphical output will be used for measurement or navigation, or the direction of North is important for the interpretation of the content, or the content is intended to display distortions and artifacts created by projection. Unnecessary use of graticules only adds visual clutter but little relevant information. Use of coastlines, administrative boundaries or place names permits most viewers of the output to orient themselves better than a graticule."

Examples

mtq <- mf_get_mtq()
mf_map(mtq, expandBB = c(0, .1, .1, 0))
mf_graticule(mtq)

mf_graticule(
  x = mtq,
  col = "coral4",
  lwd = 2,
  lty = 2,
  expandBB = c(.1, 0, 0, .1),
  label = TRUE,
  pos = c("right", "bottom"),
  cex = .8,
  add = FALSE
)
mf_map(mtq, add = TRUE)

mapsf documentation built on Oct. 22, 2024, 5:07 p.m.