GRASS region ツール
The GRASS region tool
The region definition (setting a spatial working window) in GRASS is important
for working with raster layers. Vector analysis is per default not limited
to any defined region definitions. All newly-created rasters will have the
spatial extension and resolution of the currently defined GRASS region,
regardless of their original extension and resolution. The current GRASS
region is stored in the $LOCATION/$MAPSET/WIND file, and it
defines north, south, east and west bounds, number of columns and rows,
horizontal and vertical spatial resolution.
It is possible to switch on/off the visualization of the GRASS region in the
QGIS canvas using the grass_regionDisplay current GRASS region
button. <A NAME="371"></A>.
With the grass_region_editEdit current GRASS region icon you
can open a dialog to change the current region and the symbology of the GRASS
region rectangle in the QGIS canvas. Type in the new region bounds and
resolution and click OK. It also allows to select a new region
interactively with your mouse on the QGIS canvas. Therefore click with the
left mouse button in the QGIS canvas, open a rectangle, close it using the
left mouse button again and click OK.<A NAME="376"></A>
The GRASS module g.region provide a lot more parameters to define
an appropriate region extend and resolution for your raster analysis. You can
use these parameters with the GRASS Toolbox, described in Section
9.9.
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