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<p>Hi Jon,</p>
<p>Thanks for your reply. It's very interesting to make a python
script, even if the input data doe not come from grass database as
I would like.</p>
<p>Cheers,</p>
<p>Frank<br>
</p>
<div class="moz-cite-prefix">Le 31/10/2018 à 12:35, Jón Eiríksson a
écrit :<br>
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<blockquote type="cite"
cite="mid:3B3C1EB6-F4E8-4035-A14C-6408B663538E@hi.is">
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<p dir="auto">The following partial script may be helpful
(having the source map in shape format):</p>
<h1 style="font-size:1.4em">assume folder in home directory
containing source map - in this case contours.shp</h1>
<h1 style="font-size:1.4em">v_w,v_s,v_e,v_n are string
variables with destination region</h1>
<h1 style="font-size:1.4em">the commands create a subset
defined by the destination region: contours.shp</h1>
<h1 style="font-size:1.4em">note that the identical naming of
input and output is perhaps confusing but harmless</h1>
<h1 style="font-size:1.4em">as long as the home directory does
not contain files named contours.*</h1>
<h1 style="font-size:1.4em">—</h1>
<h1 style="font-size:1.4em">importing required modules</h1>
<p dir="auto">import os<br>
import sys<br>
import subprocess<br>
from array import array<br>
import string<br>
import math<br>
from grass.script import core as grass<br>
from grass.script import db as grass</p>
<h1 style="font-size:1.4em">excerpt</h1>
<pre style="background-color:#F7F7F7; border-radius:5px 5px 5px 5px; margin-left:15px; margin-right:15px; max-width:90vw; overflow-x:auto; padding:5px" bgcolor="#F7F7F7"><code style="background-color:#F7F7F7; border-radius:3px; margin:0; padding:0" bgcolor="#F7F7F7">cmd = 'ogr2ogr -clipsrc' + ' ' + v_w + ' ' + v_s + ' ' + v_e + ' ' + v_n
cmd = cmd + ' ' + '~/contours.shp' + ' ~/folder_name/contours.shp'
subprocess.call(cmd, shell = True)
grass.run_command('v.in.ogr', input='contours.shp', layer='contours', output='contours')
</code></pre>
<p dir="auto">Jon</p>
<p dir="auto">On 31 Oct 2018, at 10:12, Frank David wrote:</p>
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<p dir="auto">Hello,<br>
<br>
What is the best and fast way to make a copy of a part of
vector map (national) to get a smaller territory ?
(partial copy).<br>
Thank you for your advice !<br>
<br>
Frank<br>
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