Hi,

I had written a post about intervisibility with R & GRASS on my blog. I
hope it will be helpful for you. I don't explain how to connect R and GRASS
but you will find a lot of articles about that on the web.
http://www.datagistips.com/2011/09/on-road-with-r-grass-intervisibility.html

Best

2012/4/21 Barry Rowlingson <b.rowlingson@lancaster.ac.uk>

> On Sat, Apr 21, 2012 at 1:38 PM, Raphael Fuhrer
> <raphael.fuhrer@gmail.com> wrote:
> > Dear all
> >
> > Does anybody know if it is possible to conduct a visibility analysis in
> R?
> > I have
> > - a large set of points = observer points
> > - a digital surface model as an ascii grid
> > - a set of points and polygons defining an amount of grid cells of
> interest
> > For every individual observer point, the task is to check how many cells
> of interest are visible.
> >
> > Since the number of observer points is limited to 8 in ArcGIS and
> calculation time is far too long, I decided to use R. Unfortunately, I
> could not find any helpful packages or information on the internet.
>
>  I suspect your best option is to use GRASS-GIS, and there is a
> package for R-GRASS integration but I don't know much about it:
>
> http://cran.r-project.org/web/packages/spgrass6/index.html
>
> The relevant GRASS module is r.viewshed (r here stands for raster, not R):
>
> http://grass.osgeo.org/manuals/html70_user/r.viewshed.html
>
> Free and open source, of course it is!
>
> Barry
>
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