[GRASS-user] Differential growth

[Hamish]

Trevor Wiens wrote:
> I have a situation where I'm examining the growth of industrial
> footprint in native prairie. One of the factors is invasion by
> non-native species along roads. These species will grow at different
> rates on different soils. This is relatively easy to solve using
> v.buffer as there is a buffer column option. 
> 
> What I'm unsure of how to deal with is that there is a directional
> component because of prevailing winds. I was thinking that probably
> the only way to do this was to convert to raster and then use
> iterations of r.mapcalc to grow the footprint at different rates in
> different directions (basically splitting the r.mapcalc buffer example
> from the pdf documentation into four parts). This would work but this
> will involve creating a lot of temporary files splitting of the ages
> and soil types and then in the end merging it all back together again.
> 
> Does anyone know of a more elegant way to do this?


r.cost with a dynamic cost surface?

e.g.
r.buffer for each soil type + r.patch

r.plane for prevailing winds

then

r.mapcalc costsurf = r.buffer + r.plane


?
Hamish