How to smooth/generalize a polygon in qgis

Question

Is it possible to smooth or generalize a polygon in qgis? Ìs there a plugin available like the generalizer-plugin for lines? I could convert my polygons to lines, smooth them and convert them back to polygones. But this is not working for my polygons because of sveral reasons.

Any idea? Thanks!

Answer 1

you can use:

Vector menu -> Geometry tools -> Simplify Geometries

.

Beside this you can use Douglas-Peucker algorithm in postgis too, so you can use in postgis then adding postgis layer to qgis. you can find some info here about Simplify: Reduce the weight of a geometry.

SELECT simplify(the_geom,500) as simpgeom 
    FROM neighborhoods

i hope it helps you...