Add a land layer on basemaps

Adds a layer of land on basemap plots

add_land(
  plot = NULL,
  keep.glaciers = FALSE,
  land.col = "grey60",
  size.land = 0.1,
  border.col.land = "black",
  gla.col = "grey95",
  size.glacier = 0.1,
  border.col.glacier = "black",
  grid.col = "grey70",
  size.grid = 0.1,
  label.print = FALSE,
  label.offset = 1.05,
  label.font = 8
)

Arguments

plot	Not implemented yet. basemap where the land should be added to. Extracts the definitions automatically.
keep.glaciers	Logical indicating whether glaciers should be kept for the Svalbard maps. Setting this to FALSE speeds up map plotting by a few seconds.
land.col	Character code specifying the color of land.
size.land	Numeric value specifying the width of the border line for land shapes. See details for explanation about line widths.
border.col.land	Character code specifying the color of the border line for land shapes.
gla.col	Character code specifying the color of glaciers.
size.glacier	Numeric value specifying the width of the border line for glacier shapes.
border.col.glacier	Character code specifying the color of the border line for glacier shapes.
grid.col	Character code specifying the color of grid lines. Use NA to remove the grid lines.
size.grid	Numeric value specifying the width of the grid lines.
label.print	Logical indicating whether labels should be printed for polar stereographic maps.
label.offset	Offset between the round polar stereographic maps and longitude labels. Optimized for a pdf output. Use 1.1 for larger size figures.
label.font	Numeric value specifying the font size for labels in polar stereographic maps. Note that this value defines the actual font size in points, not the ggplot2 font size.