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Last data update: 2014.03.03

R: Scalebar for Projected Maps

Scalebar

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

Results


R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(SDMTools)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/SDMTools/Scalebar.Rd_%03d_medium.png", width=480, height=480)
> ### Name: Scalebar
> ### Title: Scalebar for Projected Maps
> ### Aliases: Scalebar
> 
> ### ** Examples
> 
> #create a simple object of class 'asc'
> tasc = as.asc(matrix(1:50,nr=50,nc=50)); print(tasc)
Raster map of class "asc":
Cell size:  1 
Number of rows:  50 
Number of columns:  50 
Type:  numeric 
> 
> #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
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>