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\section{Raster Algebra Plugin}\label{sec:raster_algebra}

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\minisec{Install the Raster Algebra Plugin}

To use the functionalities in QGIS, you must install the Raster Algebra 
python plugin with the \mainmenuopt{Fetch Python Plugins} Installer 
(see chapter \ref{sec:load_external_plugin}). Then select and load it 
with the Plugin Manager. Therefore click the menu \mainmenuopt{Plugins} 
\arrow \mainmenuopt{Manage Plugins}, select \dropmenuopt{Raster Algebra} 
and click \button{OK}. A new \toolbtntwo{copyright_label}{Raster Algebra} 
icon occurs in the toolbar.

