cartography (version 1.3.0)

labelLayer: Label Layer

Description

Put labels on a map.

Usage

labelLayer(spdf, df, spdfid = NULL, dfid = NULL, txt, col = "black", cex = 0.7, ...)

Arguments

spdf

a SpatialPointsDataFrame or a SpatialPolygonsDataFrame; if spdf is a SpatialPolygonsDataFrame texts are plotted on centroids.

df

a data frame that contains the labels to plot.

spdfid

identifier field in spdf, default to the first column of the spdf data frame. (optional)

dfid

identifier field in df, default to the first column of df. (optional)

txt

labels field in df.

col

labels color.

cex

labels cex.

...

further text arguments, such as pos or adj.

See Also

layoutLayer

Examples

data("nuts2006")

# Layout plot
layoutLayer(  title = "Most Populated Countries of Europe", 
              author = "", sources = "",
              scale = NULL,col = NA, coltitle = "black",
              frame = FALSE, bg = "#A6CAE0",
              south = TRUE, extent = nuts0.spdf)

plot(world.spdf, col  = "#E3DEBF", border=NA, add=TRUE)
plot(nuts0.spdf, col = "#D1914D",border = "white", lwd=1, add=TRUE)

# Selection of the 10 most populated countries of Europe
dflab <- nuts0.df[order(nuts0.df$pop2008, decreasing = TRUE),][1:10,]

# Label creation 
dflab$lab <- paste(dflab$id, "\n", round(dflab$pop2008/1000000,0), "M", sep ="")

# Label plot of the 10 most populated countries
labelLayer(spdf = nuts0.spdf, df = dflab, txt = "lab", 
           col = "#690409", cex = 0.9, font = 2)
text(x = 5477360, y = 4177311, labels = "The 10 most populated countries of Europe
Total population 2008, in millions of inhabitants.",
     cex = 0.7, adj = 0)