Scalebar: Scalebar for Projected Maps

In SDMTools: Species Distribution Modelling Tools: Tools for processing data associated with species distribution modelling exercises

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 [e-mail]

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

Example output

Raster map of class "asc":
Cell size:  1 
Number of rows:  50 
Number of columns:  50 
Type:  numeric 

SDMTools documentation built on Jan. 11, 2020, 9:23 a.m.