Geography Reference
In-Depth Information
Figure 10.5: Merged GTOPO30 DEM
with the color map set to the same we used in Section 10.4 , Colorizing
the Hillshade, on page 161 . We could now create a nice hillshade from
the DEM or use it in some sort of analysis, such as melting the Antarctic
ice sheet and determining the effect on sea level using r.lake .
10.6
Clipping Features
Sometimes you want to create or modify a dataset by constraining it
to an area of interest. We call this clipping, and you can do it for both
raster and vector datasets using GRASS. In this section, we'll look at
clipping the “collars” from a USGS DRG to allow them to display nicely
side by side. We'll also look at clipping vector features to create a subset
of a larger dataset.
 
 
 
 
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