November 2018
Beginner to intermediate
272 pages
5h 36m
English
Content preview from Learn QGIS - Fourth Edition
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Computing zonal statistics
Sometimes, it is necessary to compute statistics for selected regions. This is what the zonal statistics does in the raster processing toolbox. For example, we can compute landcover class statistics areas around each airport using landcover.img and airports.shp from our sample data. This is useful when it comes to finding the most commonly occurring terrain type, in other words, the median value.
First, we create the analysis areas around each airport using the Vector | Geoprocessing Tools | Buffer(s) tool and a buffer size of 100,000 feet, as demonstrated in the following screenshot:
The buffer tool dialog box
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