Plot a map

This is the main function of the package. mf_map() can be used to plot all types of maps.
The three main arguments are: x (sf object), var (variable to map), and type (map type).
Relevant arguments and default values for each map types are detailed in specific functions, see Details.

mf_map(
  x,
  var,
  type = "base",
  breaks,
  nbreaks,
  pal,
  alpha,
  inches,
  val_max,
  symbol,
  col,
  lwd_max,
  val_order,
  pch,
  cex,
  border,
  lwd,
  col_na,
  cex_na,
  pch_na,
  leg_pos,
  leg_title,
  leg_title_cex,
  leg_val_cex,
  leg_val_rnd,
  leg_no_data,
  leg_frame,
  expandBB,
  add
)

Arguments

x

object of class sf or sfc

var

name(s) of the variable(s) to plot

type

map type:

• base, base maps,

• prop, proportional symbols maps,

• choro, choropleth maps,

• typo, typology maps,

• symb, symbols maps,

• grad, graduated symbols maps,

• prop_choro, proportional symbols maps with symbols colors based on a quantitative data classification,

• prop_typo, proportional symbols maps with symbols colors based on qualitative data,

• symb_choro, symbols maps with symbols colors based on a quantitative data classification

breaks

either a numeric vector with the actual breaks, or a classification method name (see mf_get_breaks and Details)

nbreaks

number of classes

pal

a set of colors or a palette name (from hcl.colors)

alpha

if pal is a hcl.colors palette name, the alpha-transparency level in the range [0,1]

inches

size of the biggest symbol (radius for circles, half width for squares) in inches.

val_max

maximum value used for proportional symbols

symbol

type of symbols, 'circle' or 'square'

col

color

lwd_max

line width of the largest line

val_order

values order, a character vector that matches var modalities

pch

pch (point type) for symbols

cex

cex (point size) for symbols

border

border color

lwd

border width

col_na

color for missing values

cex_na

cex (point size) for NA values

pch_na

pch (point type) for NA values

leg_pos

position of the legend, one of 'topleft', 'top','topright', 'right', 'bottomright', 'bottom', 'bottomleft', 'left' or a vector of two coordinates in map units (c(x, y)). If leg_pos = NA then the legend is not plotted. If leg_pos = 'interactive' click onthe map to choose the legend position.

leg_title

legend title

leg_title_cex

size of the legend title

leg_val_cex

size of the values in the legend

leg_val_rnd

number of decimal places of the values in the legend

leg_no_data

label for missing values

leg_frame

whether to add a frame to the legend (TRUE) or not (FALSE)

expandBB

fractional values to expand the bounding box with, in each direction (bottom, left, top, right)

add

whether to add the layer to an existing plot (TRUE) or not (FALSE)

Value

x is (invisibly) returned.

Details

Relevant arguments and default values for each map types are detailed in specific functions:

• base, base maps (mf_base);

• prop, proportional symbols maps (mf_prop);

• choro, choropleth maps (mf_choro);

• typo, typology maps (mf_typo);

• symb, symbols maps (mf_symb);

• grad, graduated symbols maps (mf_grad);

• prop_choro, proportional symbols maps with symbols colors based on a quantitative data classification (mf_prop_choro);

• prop_typo, proportional symbols maps with symbols colors based on qualitative data (mf_prop_typo);

• symb_choro, symbols maps with symbols colors based on a quantitative data classification (mf_symb_choro).

Breaks defined by a numeric vector or a classification method are left-closed: breaks defined by c(2, 5, 10, 15, 20) will be mapped as:
[2 - 5[
[5 - 10[
[10 - 15[
[15 - 20]
The "jenks" method is an exception and has to be right-closed. Jenks breaks computed as c(2, 5, 10, 15, 20) will be mapped as:
[2 - 5]
]5 - 10]
]10 - 15]
]15 - 20]

Examples

mtq <- mf_get_mtq()
mf_map(mtq)
mf_map(mtq, var = "POP", type = "prop")

mf_map(mtq, var = "MED", type = "choro")

mf_map(mtq, var = "STATUS", type = "typo")

mf_map(mtq)
mf_map(mtq, var = "STATUS", type = "symb")

mf_map(mtq)
mf_map(mtq, var = "POP", type = "grad")

mf_map(mtq)
mf_map(mtq, var = c("POP", "MED"), type = "prop_choro")

mf_map(mtq)
mf_map(mtq, var = c("POP", "STATUS"), type = "prop_typo")

mf_map(mtq)
mf_map(mtq, var = c("STATUS", "MED"), type = "symb_choro")