Working with GRASS modules

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Working with GRASS modules

<A NAME="fig:grass_modules"></A><A NAME="subfig:grass_module_tree"></A><A NAME="subfig:grass_module_list"></A><A NAME="394"></A>
Figure: GRASS Toolbox and searchable Modules List
[Modules Tree] [clip=true, width=0.4]grass_toolbox_moduletree [Searchable Modules List] [clip=true, width=0.4]grass_toolbox_modulelist

<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.



<A NAME="fig:grass_module_dialog"></A><A NAME="subfig:grass_module_option"></A><A NAME="subfig:grass_module_output"></A><A NAME="subfig:grass_module_manual"></A><A NAME="412"></A>
Figure: GRASS Toolbox Module Dialogs
[Module Options] [clip=true, width=0.3]grass_module_option [Modules Output] [clip=true, width=0.3]grass_module_output [Module Manual] [clip=true, width=0.3]grass_module_manual



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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