Geografic-Information-System/gui/wxpython/gmodeler/g.gui.gmodeler.html

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<h2>DESCRIPTION</h2>

<p>
The <b>Graphical Modeler</b> is
a <em><a href="wxGUI.html">wxGUI</a></em> component which allows the user to
create, edit, and manage complex models using easy-to-use
interface. When performing analytical operations in GRASS, the
operations are not isolated, but part of a chain of operations. Using
Graphical Modeler, that chain of processes (ie. GRASS modules)
can be wrapped into one process (ie. model). So it's easier to execute
the model later with slightly different inputs or parameters.

<p>
The modeler can be launched from the Layer Manager menu <tt>File ->
Graphical modeler</tt> or from the main
toolbar <img src="icons/modeler-main.png" alt="icon">. It's also
available as stand-alone module <em>g.gui.gmodeler</em>.

<p>
The Graphical Modeler allows you to:

<ul>
  <li>define data items (raster, vector, 3D raster maps)</li>
  <li>define actions (GRASS commands)</li>
  <li>define relations between data and action items</li>
  <li>define loops (eg. map series) and conditions (if-else statements)</li>
  <li>define model variables</li>
  <li>parameterize GRASS commands</li>
  <li>define intermediate data</li>
  <li>validate and run model</li>
  <li>store model properties to the file (<tt>GRASS Model File|*.gxm</tt>)</li>
  <li>export model to Python script</li>
  <li>export model to image file</li>
</ul>

<center>
<br>
<img src="gmodeler_frame.jpg" border="1" alt="screenshot">
<br>
Figure: A model to perform unsupervised classification using MLC and SMAP
</center>

<h2>SEE ALSO</h2>

<em>
  <a href="wxGUI.html">wxGUI</a><br>
  <a href="wxGUI.components.html">wxGUI components</a>
</em>

<p>
User-defined models available
from <a href="http://svn.osgeo.org/grass/grass-addons/wxgui_modeler">SVN</a>.

<p>
See also
the <a href="http://grasswiki.osgeo.org/wiki/WxGUI_Graphical_Modeler">wiki</a> page
(especially various <a href="http://grasswiki.osgeo.org/wiki/WxGUI_Graphical_Modeler#Video_tutorials">video
tutorials</a>).

<h2>AUTHOR</h2>

Martin Landa, Czech Technical University in Prague, Czech Republic

<p>
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