[R-sig-Geo] spplot, polygons, and line density fill

Matthew Landis landis at isciences.com
Fri Apr 8 17:25:58 CEST 2011

In case my request wasn't really clear, let me rephrase:

I'd like to overlay some polygons onto a raster, by plotting with a line 
density fill instead of a solid fill, as shown here 
http://r-spatial.sourceforge.net/gallery/#fig15.R.  Ideally I would be 
able to modify the angle of the lines.  I know how to do this in base 
graphics, but I really need to use spplot (or willing to use ggplot2 if 
that can do what I want).

Thanks in advance for any ideas!


On 4/8/2011 11:21 AM, Matthew Landis wrote:
> Hello again R-sig-geo-ers,
> Does anyone know how to convince spplot to create a figure like 
> http://r-spatial.sourceforge.net/gallery/#fig15.R
> I would like to overlay some polygons onto a raster, and I need to do 
> it with spplot for the lattice functionality.  I've looked at the help 
> and the function code for sp.polygon and grid.polygon, as well as 
> searched a bit on Google, but I'm not finding anything promising, but 
> then, I'm not that familiar with grid graphics.
> Since we're talking about R, I have a hard to time believing the 
> answer is "it's not possible".
> M
> <http://r-spatial.sourceforge.net/gallery/#fig15.R>

Matthew Landis, Ph.D.
Research Scientist
ISciences, LLC
61 Main St. Suite 200
Burlington VT 05401

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