R: Add labels to a map

text {raster} | R Documentation

## Add labels to a map

### Description

Plots labels, that is a textual (rather than color) representation of values, on top an existing plot (map).

### Usage

    ## S4 method for signature 'RasterLayer'
    text(x, labels, digits=0, fun=NULL, halo=FALSE, ...)

    ## S4 method for signature 'RasterStackBrick'
    text(x, labels, digits=0, fun=NULL, halo=FALSE, ...)

    ## S4 method for signature 'SpatialPolygons'
    text(x, labels, halo=FALSE, ...)

    ## S4 method for signature 'SpatialPoints'
    text(x, labels, halo=FALSE, ...)

### Arguments

`x` | Raster*, SpatialPoints* or SpatialPolygons* object
`labels` | character. Optional. Vector of labels with `length(x)` or a variable name from `names(x)`
`digits` | integer. how many digits should be used?
`fun` | function to subset the values plotted (as in `rasterToPoints`)
`halo` | logical. If `TRUE` a 'halo' is printed around the text. If `TRUE`, additional arguments `hc='white'` and `hw=0.1` can be modified to set the colour and width of the halo
`...` | additional arguments to pass to graphics function `text`

### See Also

`text, plot`

### Examples

    r <- raster(nrows=4, ncols=4)
    r <- setValues(r, 1:ncell(r))
    plot(r)
    text(r)

    plot(r)
    text(r, halo=TRUE, hc='blue', col='white', hw=0.2)

    plot(r, col=bpy.colors(5))
    text(r, fun=function(x){x<5 | x>12}, col=c('red', 'white'), vfont=c("sans serif", "bold"), cex=2)

[Package raster version 3.3-7 Index]