[GRASS-user] r.viewshed Python Script OSError

Martin Lacayo mlacayo at stanford.edu
Tue May 28 10:09:59 PDT 2013

Hi Markus,

I did install r.viewshed (it is located in ~/.grass6/addons/), and the
full path does appear in $PATH.

I am executing the Python script from outside of GRASS. Is this
normal? I am hoping for some advice on this. The intent is to liberate
some software (naturalcapitalproject.org) from ArcGIS for users on

When I start GRASS (in text mode) it says "Welcome to GRASS 6.4.2 (2012)."

Thank you,

On Sun, May 26, 2013 at 1:27 PM, Markus Metz
<markus.metz.giswork at gmail.com> wrote:
> On Fri, May 24, 2013 at 11:32 PM, Martin Lacayo <mlacayo at stanford.edu> wrote:
>> Hello,
>> I am using GRASS 6.4 on Debian. I am trying to make a call to
>> r.viewshed from Python, but it fails with the following exception:
>> OSError: [Errno 2] No such file or directory
>> Any suggestions?
> Did you install r.viewshed?
> Where is the r.viewshed binary?
> Is the location of r.viewshed in the PATH (within GRASS, test with
> "echo $PATH")?
> Did you execute the python script from within GRASS?
> Which GRASS 6.4 version are you using? Recommended is 6.4.3.svn.
> Markus M

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