Hi Anna - thank you for the suggestion - I tried it but alas, still it only
outputs a single vector map (layer). I can get either the Country vector or the
admin_areas vector, but not both overlaid.:(Chris
On Tuesday, February 9, 2021, 1:20:52 PM EST, Anna Petrášová
<[email protected]> wrote:
Hi,
On Tue, Feb 9, 2021 at 10:25 AM Chris Bartolomei via grass-user
<[email protected]> wrote:
Good morning :)I'm using GRASS 7.4.1 on a Linux cluster so I only have
command-line capability. I have two vector layers (a country boundary polygon
and part of an administrative area map - also polygons). I am trying to
automate creating a PNG file of the admin areas overlaying the country boundary
therefore all work has to be command-line (in a bash script). I've tried this
two ways - using the d.mon start=png method and also the ps.map method as
described below. The d.mon method appears to generate the image with only one
vector map (not both) and only colors the borders - it won't use the fill_color
setting. The ps.map method seems to work but assumes the image is on a sheet of
paper so there's a ton of extra white-space. I'd like to use d.mon but I can
use ps.map if someone could please let me know how to export only the
computational region without all the extra 'paper' in the image. Here's my code:
g.region vector='Country'export GRASS_RENDER_IMMEDIATE=pngexport
GRASS_RENDER_WIDTH=640export GRASS_RENDER_HEIGHT=480export
GRASS_RENDER_TRANSPARENT=trueexport GRASS_RENDER_TRUECOLOR=trueexport
GRASS_RENDER_FILE=$HOME/country_admin.pngexport
GRASS_RENDER_FILE_COMPRESSION=0export GRASS_MESSAGE_FORMAT=plaind.mon
start=pngd.vect map=Country color=210:210:210 fill_color=153:153:153
display=shape type=aread.vect map=admin_area color=153:153:153
rgb_column=area_color display=shape type=aread.mon stop=png
This only produces a png with the last vector listed and only the borders are
colored with the rgb_column values.
I think you are missing
GRASS_RENDER_FILE_READ=TRUE:https://grass.osgeo.org/grass78/manuals/pngdriver.html
Regarding rgb_column, I am not sure, didn't have time to test.
Anna
If I do this without the d.mon start/stop lines ... i.e. relying on the
GRASS_RENDER_IMMEDIATE=png only, then only one vector map is converted to png
however it DOES do the color fill properly. With either above method the png is
the correct size.
Now using ps.map (same env variable set as above):
g.region vector='Country'
ps.map input=$HOME/ps_rules.txt out=$HOME/country_admin.ps --overwrite
where ps_rules.txt is:border y color 81:81:81 endvareas admin_area layer 1
rgbcolumn area_color color 153:153:153 endvareas Country color 210:210:210
fcolor 153:153:153 end
We don't have pstopng but we do have ghostscript:
gs-dSAFER -dBATCH -dNOPAUSE -sDEVICE=png16m -dTextAlphaBits=4
-dGraphicsAlphaBits=4 -r300 -sOutputFile=$HOME/country_admin.png
$HOME/country_admin.ps
This creates the correct image (color fills, etc) but has white margins and a
lot of white space below the image like it is printed at the top of a piece of
paper.
does anyone have any idea how to create a png with multiple vector maps
overlaying each other (and not have the extra whitespace too)?
v/rChris
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