Creating homogeneous groups of areas from raster using QGIS

Question

I'm trying to create homogeneous groups of areas from a raster which contain elevations data (in the red area).

currently I am doing it manually creating new polygons for each groups.

Is there a way to do it automatically using QGIS?

Babel · Accepted Answer

You can use GDAL: it has a function contour polygons (version 2.4 or later) as part of gdal_contour.  It is accessible from the QGIS processing toolbox. If you don't find the entry contour polygons there, just use the contour tool and set the parameter -p: it creates polygons instead of lines - you can set this in the Additional command-line parameters [optional] box. See the link above for details.

Creating homogeneous groups of areas from raster using QGIS

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