Geografic-Information-System/scripts/v.clip/v.clip.html

<h2>DESCRIPTION</h2>

<em>v.clip</em> module enables extracting those features of input
vector map, which overlay features of clip map, as well as their
storing in a new vector map.
 
<p>In default, boundaries of clip map are dissolved before
clipping. Alternatively, flag <b>-d</b> can be ticked to retain the
boundaries of clip map. Flag <b>-b</b> facilitates clipping by current
computational region.

<p>It is possible to clip vector maps consisting of points, lines,
areas or combinations of these. However, the current version does not
fully support clipping of mixed geometry containing points. In such a
case, the output map will only store clipped lines and/or areas.

<h2>NOTES</h2>

<em>v.clip</em> is a front-end
to <em><a href="v.overlay.html">v.overlay</a></em>, as well
as <em><a href="v.select.html">v.select</a></em>. Clipping of areas
and/or lines can be achieved
using <em><a href="v.overlay.html">v.overlay</a></em>. Clipping of
points can be performed
with <em><a href="v.select.html">v.select<a></em>.

<h2>EXAMPLES</h2>

<h3>Basic use</h3>

Clip railroads by counties Wake and Johnston in North Carolina (North
Carolina data set).

<div class="code"><pre>
v.extract input=boundary_county where="NAME='WAKE' OR NAME='JOHNSTON'" output=county_WAKE_JOHNSTON
v.clip input=railroads clip=county_WAKE_JOHNSTON output=railroads_WAKE_JOHNSTON
</pre></div>

<center>
 <img src="v_clip_poly.png" alt="v.clip example" height="255" width="600" ><br>
 <em>Figure: v.clip example - basic use</em>
</center>


<h3>Retain boundaries of clip map</h3>

<div class="code"><pre>
v.clip -d input=railroads clip=county_WAKE_JOHNSTON output=railroads_WAKE_JOHNSTON
</pre></div>

<h3>Clip by current computational region</h3>

Clip hospitals by computational region adjusted to counties Wake and
Johnston in North Carolina (North Carolina data set).

It is not obligatory to enter name of clip map. In case it is stated,
the clip map will be omitted.

<div class="code"><pre>
v.extract input=boundary_county where="NAME='WAKE' OR NAME='JOHNSTON'" output=county_WAKE_JOHNSTON
v.clip -r input=hospitals output=hospitals_clip
</pre></div>

<center>
 <img src="v_clip_region.png" alt="v.clip example" height="259" width="600"><br>
 <em>Figure: v.clip example - clip by computational region</em>
</center>

<h2>SEE ALSO</h2>

<em>
  <a href="v.overlay.html">v.overlay</a>,
  <a href="v.select.html">v.select</a>, 
  <a href="v.dissolve.html">v.dissolve</a>,
  <a href="v.in.region.html">v.in.region</a>
</em>

<h2>AUTHOR</h2>

Zofie
Cimburova, <a href="http://geomatics.fsv.cvut.cz/research/geoforall/">GeoForAll
Lab</a>, Czech Technical University in Prague, Czech Republic

<p>
<i>Last changed: $Date: 2016-06-28 19:30:00 +0001 (Tue, 28 Jun 2016)$</i>