R: Scalebar for Projected Maps

Scalebar {SDMTools} | R Documentation

## Scalebar for Projected Maps

### Description

`Scalebar` adds a distance scalebar onto a projected map. It is not appropriate for geographic projections.

### Usage

    Scalebar(x, y, distance, unit = "km", scale = 1, t.cex = 0.8)

### Arguments

`x` | the x-axis position for the lower left corner of the bar
`y` | the x-axis position for the lower left corner of the bar
`distance` | the distance for which the scale bar should represent
`unit` | the units to report as the scaling
`scale` | the scaling factor to rescale the distance to a different unit. e.g., if your map is in m and want the scalebar to be in km, use a scale of 0.01
`t.cex` | the scaling of the font size to be used for the scalebar

### Value

nothing is returned, simply a scalebar is added to a plot.

### Author(s)

Jeremy VanDerWal jjvanderwal@gmail.com

### Examples

    #create a simple object of class 'asc'
    tasc = as.asc(matrix(1:50,nr=50,nc=50)); print(tasc)

    #plot the image
    image(tasc,axes=FALSE,ann=FALSE)

    #add a distance scalebar
    Scalebar(x=5,y=5,distance=20) #show values in km
    Scalebar(x=5,y=10,distance=20,unit='m',scale=1000) #show values in meters

[Package SDMTools version 1.1-221.2 Index]