Working with GRASS modules
Working with GRASS modules
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<P> The GRASS Shell inside the GRASS Toolbox provides access to almost all (more than 300) GRASS modules in command line modus. To offer a more user friendly working environment, about 200 of the available GRASS modules and functionalities are also provided by graphical dialogs. These dialogs are grouped in thematic blocks, but are searchable as well. You find a complete list of GRASS modules available in QGIS version in appendix #appdx_grass_toolbox_modules. It is also possible to customize the GRASS Toolbox content. It is described in Section <A HREF="node15.html#sec:toolbox-customizing">9.9.3</A>.
As shown in Figure <A HREF="#fig:grass_modules">34</A>, you can look for the appropriate
GRASS module using the thematically grouped Modules Tree or the
searchable Modules List tab.
Clicking on a grapical module icon a new tab will be added to the toolbox
dialog providing three new sub-tabs Options, Output and
Manual. In Figure <A HREF="#fig:grass_module_dialog">35</A> you see an example
for the GRASS module v.buffer.
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Options
The Options tab provides a simplified module dialog where you can
usually select a raster or vector layer visualized in the QGIS canvas and
enter further module specific parameters to run the module. The provided
module parameters are often not complete to keep the dialog clear. If you want
to use further module parameters and flags, you need to start the GRASS Shell
and run the module in the command line.
Output
The Output tab provides information about the output status of the
module. When you click the Run button, the module switches to the
Output tab and you see information about the analysis process. If all
works well, you will finally see a Successfully finished message.
Manual
The Manual tab shows the HTML help page of the GRASS module. You can
use it to check further module parameters and flags or to get a deeper
knowledge about the purpose of the module. At the end of each module
manual page you see further links to the Main Help index, the
Thematic index and the Full index. These links provide
the same information as if you use the module g.manual
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