[GRASS-user] d.vect output a black PNG

[Carlos Grohmann]

It works! Thanks for the tip Anna!

Carlos

On Thu, Jan 18, 2018 at 9:59 PM, Anna Petrášová <kratochanna at gmail.com>
wrote:

> Have you tried cairo driver? I feel like I've seen something like this
> before with PNG driver.
>
> Anna
>
> On Thu, Jan 18, 2018 at 5:46 PM, Carlos Grohmann <
> carlos.grohmann at gmail.com> wrote:
>
>> Hello all
>>
>> Continuing my process of making a series of maps for a paper using python
>> loops and d.mon with PNG outputs, now d.vect is giving me a hard time.
>>
>> using a loop like this one:
>>
>>     for dem in dems:
>>         out_shade = dem + area + '_shade_315_20'
>>         vect_contour = dem + area + '_contours_zoom'
>>         grass.run_command('g.region',n=n,s=s,w=w,e=e, flags='pa')
>>         grass.run_command('d.mon', start='png',
>> output=dem+area+'_shade_contours.png', \
>>             resolution='3', height=500, width=500, overwrite=True)
>>         grass.run_command('d.rast', map=out_shade)
>>         grass.run_command('d.vect', map=vect_contour, type='line')
>>         grass.run_command('d.grid', size='0.025', text_color='black',
>> fontsize=16, flags='c')
>>         grass.run_command('d.mon', stop='png')
>>
>> I get maps that are ok, some that are partially blacked out and some that
>> are completely black!
>>
>> Any hints on this? The area in the images below is quite small, and the
>> contour lines were calculated only in this small region, to keep the
>> filesize small.
>>
>>
>> I tried this on MacOS (homebrew and Michael's new binary) and on Linux,
>> with the same results.
>>
>>
>> many thanks
>>
>> Carlos
>>
>>
>>
>>
>>
>>
>> [image: Inline image 1][image: Inline image 2][image: Inline image 4][image:
>> Inline image 5][image: Inline image 3]
>>
>>
>> --
>> Prof. Carlos Henrique Grohmann
>> Institute of Energy and Environment - Univ. of São Paulo, Brazil
>> - Digital Terrain Analysis | GIS | Remote Sensing -
>>
>> http://carlosgrohmann.com
>> http://orcid.org/0000-0001-5073-5572
>> ________________
>> Can’t stop the signal.
>>
>> _______________________________________________
>> grass-user mailing list
>> grass-user at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/grass-user
>>
>
>


-- 
Prof. Carlos Henrique Grohmann
Institute of Energy and Environment - Univ. of São Paulo, Brazil
- Digital Terrain Analysis | GIS | Remote Sensing -

http://carlosgrohmann.com
http://orcid.org/0000-0001-5073-5572
________________
Can’t stop the signal.
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