North Arrow {GISTools} | R Documentation |
Add a north arrow to a map
Description
Draws a north arrow on a map.
Usage
north.arrow(xb,yb,len,lab='NORTH',cex.lab=1,tcol='black',...)
Arguments
xb |
The x-centre (in map units) of the arrow base. |
yb |
The y-centre (in map units) of the arrow base. |
len |
The length (in map units) of the arrow base. |
lab |
The label for the arrow. |
cex.lab |
Scale factor for the label for the arrow. |
tcol |
The colour of the label text. |
... |
Other graphical parameters passed to the drawing of the arrow. |
Details
Draws a north arrow on a map. The arrow itself is drawn using polygon
and any extra parameters are passed to this call.
Value
None.
Author(s)
Chris Brunsdon
See Also
Examples
# Read in map data for New Haven
data(newhaven)
# Plot census block boundaries
plot(blocks)
# Add a north arrow
north.arrow(534750,152000,miles2ft(0.5),col='cyan')
# ... and a title
title('New Haven (CT)')
[Package GISTools version 1.0-1 Index]