Actually, I often use R as an scripting language
for grass. The problem is that grass commands have
to be issued using system(), which, for a complex code,
becomes inconvenient (lots of paste() for generating the
actual grass command).
Not being an expert at all on python, I wonder
if making R able of executing grass commands without
having to use system() could not be a valid alternative
to python, at least in some cases.
Anyway, I think that the real solution would be having a GIS
able of displaying R objects, sort of RGis.
Agus
Hamish escribió:
Rainer M. Krug wrote:
I am planning to write a spatial simulation model, simulating the spread
of alien species on a landscape scale by using grass.
My question how I should write the simulation model, i.e. in which
scripting language. I am using Linux and have quite a bit of experience
with R, so I thought that R (together with spgrass6) would be a nice
scripting language to write the simulation and sending the grass
commands through to grass, because it offers me quite a bit more
concerning strtucturing on the modelling side then using a normal shell
script
But the simulation should also run under Windows and I don't have any
experience with grass and R under windows.
It sounds very well suited for Linux or MacOSX, but I've little idea about the
GRASS+R Windows situation. Maybe someone on the statsgrass mailing list knows?
(taking the liberty to cc)
I have the following questions:
..
3) Is any other scripting language more suitable for what I want to
achieve (I have no experience with C / C++, but quite a bit with Delphi.
I have never used the likes of perl et al. and bash scrips seem a bit
awkward to me for bigger projects.)?
You could try python. The next version of GRASS will use python heavily for the
GUI, so expect lots of example scripts, help on the mailing list from fellow
travelers, and tight integration with the code.
Learn python in 10 min: http://www.poromenos.org/tutorials/python
Also there is a SWIG/Python interface to any needed GIS library functions,
which is pretty cool, although the grass modules generally give you what you
need without having to resort to using any low-level libgis functions.
see http://grass.gdf-hannover.de/wiki/GRASS_and_Python
http://freegis.org/cgi-bin/viewcvs.cgi/grass6/swig/python/
Hamish
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