mapsf (version 1.2.0)

mf_map_grad: Plot graduated symbols

Description

With the grad map type, mf_map() displays graduated symbols on a map.

Graduated symbols are based on classified quantitative variables.

For polygons, centroids are used to plot graduated symbols.

Usage

For polygons and points:

mf_map(x, var, type = "grad",
       breaks = "quantile", nbreaks = 3,
       col, border, lwd = 0.7, pch = 21, cex,
       alpha, expandBB, extent, bg, add = TRUE, leg_*)

For lines:

mf_map(x, var, type = "grad",
       breaks = "quantile", nbreaks = 3,
       col, lwd,
       alpha, expandBB, extent, bg, add = TRUE, leg_*)

Value

x is (invisibly) returned.

Arguments

x

object of class sf

var

name of the variable to map

type

"grad"

breaks

either a numeric vector with the actual breaks, or a classification method name. The main methods are 'quantile', 'equal', 'msd', 'ckmeans' (natural breaks), 'Q6' and 'geom'. See mf_get_breaks for details.

nbreaks

number of classes

col

color of the graduated symbols or lines, a hex code or a color name given by colors. The default color is the highlight color (see mf_theme).

border

border color for symbols, a hex code or color name given by colors. The default color is the background color (see mf_theme).

lwd

border width for graduated symbols, a vector of line widths for graduated lines

pch

type of symbol to use for points, see pch (points only)

cex

a vector of sizes for symbols (points only)

alpha, expandBB, extent, bg, add

arguments described in mf_map

leg_*

legend arguments described in mf_map

See Also

mf_map()

Examples

mtq <- mf_get_mtq()
flows <- mf_get_mtq("lines")
mf_map(mtq, bg = "cornsilk2")
mf_map(flows, "fij", "grad",
  breaks = "geom", nbreaks = 3,
  lwd = c(1, 3, 7),
  leg_title = "N. commuters",
  leg_pos = "bottomleft", leg_val_rnd = 0
)
mf_map(mtq, "POP", "grad",
  breaks = c(686, 5000, 25000, 82502),
  cex = c(1, 2, 4), pch = 22, col = "steelblue",
  leg_title = "Population", leg_pos = "topright",
  leg_frame = TRUE
)