Re: [GRASS-user] r.shade python issues

[Moritz Lennert]

On 23/05/16 15:01, Gareth Grewcock wrote:

Hi Stefan - thanks for getting back to me.

I had tried that before but still got issues, this time returning:
'NameError: name 'r' is not defined'

/r.shade(shade=aspect, color=elevation, output=elevation_aspect_shaded)/
/Traceback (most recent call last):/
/  File "", line 1, in /
/NameError: name 'r' is not defined/
/
/
Any ideas what might be causing that?



If you are using pygrass, you have to create the r.shade module object 
before using it. See [1].


If you are not using pygrass, please give us more information about what 
happens in your script before the call that fails.


Moritz

[1] https://grass.osgeo.org/grass70/manuals/libpython/pygrass_modules.html
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Re: [GRASS-user] r.shade python issues

[Laurent C.]

Hello,

I answered off-list by mistake.

Normally, when "non-zero return code1" occurs, you can see the error
generated by the module on the terminal.
Alternatively, you can try the solution given in the wiki to retrieve the error:

def read2_command(*args, **kwargs):
   kwargs['stdout'] = grass.PIPE
   kwargs['stderr'] = grass.PIPE
   ps = grass.start_command(*args, **kwargs)
   return ps.communicate()

Could you check this out and post the result here?

Regards,
Laurent

2016-05-23 9:58 GMT-05:00 Gareth Grewcock :
> Thanks for getting in touch Laurent.
>
> I have been working on a data processing script written in python which I
> want to use Grass modules in. So I have actually been using
> gscript.run_command() already. I was doing this externally and not actually
> loading Grass explicitly. I can do this successfully as follows:
>
> grass.run_command('r.in.gdal',input = ffile, output = name, quiet = 'True',
> overwrite = 'True', flags = 'o')
>
> grass.run_command('r.relief',input = name,output = hillshade_output,altitude
> = '20', azimuth = '315', zscale = '6', overwrite = 'True')
>
> grass.run_command('r.slope.aspect',elevation = name, slope = "dem_slope",
> aspect = "dem_aspect", overwrite = 'True')
>
> However, when I come to use r.shade, I get the 'non-zero return code1', so I
> have since gone back into the Grass UI to try and simply run python snippets
> but can't get r.shade to work with Python either externally or through the
> UI, I really have no idea what the problem is as all of the other modules
> work fine.
>
> Cheers,
>
> Gareth
>
> On Mon, May 23, 2016 at 3:38 PM, Laurent C.  wrote:
>>
>> Hello,
>>
>> Try this:
>>
>> import grass.script as gscript
>> gscript.run_command("r.shade", shade=aspect, color=elevation,
>> output=elevation_aspect_shaded)
>>
>> Have a look at the wiki:
>> https://grasswiki.osgeo.org/wiki/GRASS_Python_Scripting_Library
>>
>> Laurent
>>
>> 2016-05-23 8:01 GMT-05:00 Gareth Grewcock :
>> > Hi Stefan - thanks for getting back to me.
>> >
>> > I had tried that before but still got issues, this time returning:
>> > 'NameError: name 'r' is not defined'
>> >
>> > r.shade(shade=aspect, color=elevation, output=elevation_aspect_shaded)
>> > Traceback (most recent call last):
>> >   File "", line 1, in 
>> > NameError: name 'r' is not defined
>> >
>> > Any ideas what might be causing that?
>> >
>> > Cheers,
>> > Gareth
>> >
>> > On Mon, May 23, 2016 at 12:47 PM, Blumentrath, Stefan
>> >  wrote:
>> >>
>> >> Hei,
>> >>
>> >>
>> >>
>> >> Maybe the issue is missing commas?
>> >>
>> >>
>> >>
>> >> r.shade(shade=aspect, color=elevation, output=elevation_aspect_shaded)
>> >>
>> >>
>> >>
>> >> Cheers
>> >>
>> >> Stefan
>> >>
>> >>
>> >>
>> >> From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf
>> >> Of
>> >> Gareth Grewcock
>> >> Sent: 23. mai 2016 11:49
>> >> To: grass-user@lists.osgeo.org
>> >> Subject: [GRASS-user] r.shade python issues
>> >>
>> >>
>> >>
>> >> Hi – I’m having issues with r.shade module in grass 7.0.3 when trying
>> >> to
>> >> interact with data via python.
>> >>
>> >>
>> >>
>> >> r.shade runs absolutely fine through the UI, however, when I run the
>> >> syntax through the python console, I get a syntax error.
>> >>
>> >>
>> >>
>> >> I have tried a variety of different datasets and syntax but it keeps
>> >> coming back with the syntax error, I went back to manual for the basics
>> >> but
>> >> I still get the following:
>> >>
>> >>
>> >>
>> >> r.shade shade=aspect color=elevation output=elevation_aspect_shaded
>> >>
>> >>   File "", line 1
>> >>
>> >> r.shade(shade=aspect color=elevation
>> >> output=elevation_aspect_shaded)
>> >>
>> >>  ^
>> >>
>> >> SyntaxError: invalid syntax
>> >>
>> >>
>> >>
>> >> Other modules (r.in.gdal, r.relief, r.slope.aspect, g.region etc) all
>> >> run
>> >> fine through python, I am only having issues with r.shade.
>> >>
>> >>
>> >>
>> >> Does anybody have any idea what might be going wrong?
>> >>
>> >>
>> >>
>> >> Cheers,
>> >>
>> >> Gareth
>> >>
>> >>
>> >
>> >
>> >
>> > ___
>> > grass-user mailing list
>> > grass-user@lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/grass-user
>
>
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Re: [GRASS-user] r.shade python issues

[Gareth Grewcock]

Hi Stefan - thanks for getting back to me.

I had tried that before but still got issues, this time returning:
'NameError: name 'r' is not defined'

*r.shade(shade=aspect, color=elevation, output=elevation_aspect_shaded)*
*Traceback (most recent call last):*
*  File "", line 1, in *
*NameError: name 'r' is not defined*

Any ideas what might be causing that?

Cheers,
Gareth

On Mon, May 23, 2016 at 12:47 PM, Blumentrath, Stefan <
stefan.blumentr...@nina.no> wrote:

> Hei,
>
>
>
> Maybe the issue is missing commas?
>
>
>
> r.shade(shade=aspect, color=elevation, output=elevation_aspect_shaded)
>
>
>
> Cheers
>
> Stefan
>
>
>
> *From:* grass-user [mailto:grass-user-boun...@lists.osgeo.org] *On Behalf
> Of *Gareth Grewcock
> *Sent:* 23. mai 2016 11:49
> *To:* grass-user@lists.osgeo.org
> *Subject:* [GRASS-user] r.shade python issues
>
>
>
> Hi – I’m having issues with r.shade module in grass 7.0.3 when trying to
> interact with data via python.
>
>
>
> r.shade runs absolutely fine through the UI, however, when I run the
> syntax through the python console, I get a syntax error.
>
>
>
> I have tried a variety of different datasets and syntax but it keeps
> coming back with the syntax error, I went back to manual for the basics but
> I still get the following:
>
>
>
> *r.shade shade=aspect color=elevation output=elevation_aspect_shaded*
>
> *  File "", line 1*
>
> *r.shade(shade=aspect color=elevation output=elevation_aspect_shaded)*
>
> * ^*
>
> *SyntaxError: invalid syntax*
>
>
>
> Other modules (r.in.gdal, r.relief, r.slope.aspect, g.region etc) all run
> fine through python, I am only having issues with r.shade.
>
>
>
> Does anybody have any idea what might be going wrong?
>
>
>
> Cheers,
>
> Gareth
>
>
>
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Re: [GRASS-user] r.shade python issues

[Blumentrath, Stefan]

Hei,

Maybe the issue is missing commas?

r.shade(shade=aspect, color=elevation, output=elevation_aspect_shaded)

Cheers
Stefan

From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of 
Gareth Grewcock
Sent: 23. mai 2016 11:49
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] r.shade python issues

Hi – I’m having issues with r.shade module in grass 7.0.3 when trying to 
interact with data via python.

r.shade runs absolutely fine through the UI, however, when I run the syntax 
through the python console, I get a syntax error.

I have tried a variety of different datasets and syntax but it keeps coming 
back with the syntax error, I went back to manual for the basics but I still 
get the following:

r.shade shade=aspect color=elevation output=elevation_aspect_shaded
  File "", line 1
r.shade(shade=aspect color=elevation output=elevation_aspect_shaded)
 ^
SyntaxError: invalid syntax

Other modules (r.in.gdal, r.relief, r.slope.aspect, g.region etc) all run fine 
through python, I am only having issues with r.shade.

Does anybody have any idea what might be going wrong?

Cheers,
Gareth

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[GRASS-user] r.shade python issues

[Gareth Grewcock]

Hi – I’m having issues with r.shade module in grass 7.0.3 when trying to
interact with data via python.


r.shade runs absolutely fine through the UI, however, when I run the syntax
through the python console, I get a syntax error.


I have tried a variety of different datasets and syntax but it keeps coming
back with the syntax error, I went back to manual for the basics but I
still get the following:


*r.shade shade=aspect color=elevation output=elevation_aspect_shaded*

*  File "", line 1*

*r.shade(shade=aspect color=elevation output=elevation_aspect_shaded)*

* ^*

*SyntaxError: invalid syntax*


Other modules (r.in.gdal, r.relief, r.slope.aspect, g.region etc) all run
fine through python, I am only having issues with r.shade.


Does anybody have any idea what might be going wrong?


Cheers,

Gareth
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