mf_graticule function

Plot graticules

Display graticules and labels on a map.

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)

Returns

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)