tmap (version 0.6)

qtm: Quick thematic map plot

Description

This function is a convenient wrapper for drawing thematic maps quickly.

Usage

qtm(shp, fill = "grey90", bubble.size = NULL, bubble.col = NULL,
  text = NULL, text.cex = 1, line.lwd = NULL, line.col = NULL,
  borders = "grey40", theme = NULL, scale = 1, ...)

Arguments

shp

shape object. For tm_fill and tm_bubbles, a SpatialPolygonsDataFrame

fill

either a color to fill the polygons, or name of the data variable in shp to draw a choropleth.

bubble.size

name of the data variable in shp for the bubblemap that specifies the sizes of the bubbles. If neither bubble.size nor bubble.col is specified, no bubblemap is drawn.

bubble.col

name of the data variable in shp for the bubblemap that specifies the colors of the bubbles. If neither bubble.size nor bubble.col is specified, no bubblemap is drawn.

text

Name of the data variable that contains the text labels.

text.cex

Font size of the text labels. Either a constant value, or the name of a numeric data variable.

line.lwd

either a line width or a name of the data variable that specifies the line width. Only applicable if shp is a SpatialLines or

line.col

either a line color or a name of the data variable that specifies the line colors. Only applicable if shp is a SpatialLines or

borders

color of the polygon borders. Use NA to omit the borders.

theme

one of "World", "Europe", or "NLD"

scale

numeric value that serves as the global scale parameter. All font sizes, bubble sizes, border widths, and line widths are controled by this value. The parameters bubble.size, text.cex, and line.lwd can be scaled sepe

...

parameters passed on to the tm_* functions.

Value

• tmap-element

See Also

../doc/tmap-nutshell.html{vignette("tmap-nutshell")}

Examples

# load shape objects
data(Europe)
data(World)

# just the map
qtm(Europe)

# choropleth
qtm(Europe, fill="gdp_cap_est", text="iso_a3", text.cex="pop_est", 
    title="GDP per capita", textNA="Non-European countries")

qtm(World, fill="pop_est_dens", theme="World", style="kmeans", title="Population per km")

# bubble map
qtm(Europe, bubble.size="pop_est", bubble.col="part", theme="Europe")