GIS 2015 08 QGIS polygon contours from raster

[@Gaby-vh3kr]

Hi, what do you do if you want to show larger differences (>1)? Thanks

[@Yairsuari]

I cant see a way to define the contour density using this function (gdal_polygonize.py). you can however do it using gdal_contour.py
it also seems that th GRASS function v.surf.rst might help