[R-sig-Geo] North arrow, scale bar, legend

[izareis at dpi.inpe.br]

Hi,

I did a kernel map using Script R:

image (kernel2d  
(casos.spp,contorno.poa,h0=7000,nx=250,ny=250),add=TRUE,col=terrain.colors  
(20))

And I need to put in this map legend, north arrow and scale bar.

I tried some scripts but I fail to do.
Thanks