d.vect output a black PNG

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:
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-- 
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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