• After applying constraints to the DEM I polygonised the raster (using GRASS r.to.vect.area)
  • The result is shown below with a lot of vector with resolution = [30 * 30]
  • Is there any solution to make fusion if the difference DN between entities is 10 m for example?

enter image description here

1 Answer 1


I imported my raster file to PostGIS and I used this function to make vectorization of my raster.

I used this query

SELECT (ST_DumpAsPolygons(rast)).geom,(ST_DumpAsPolygons(rast)).val from my_raster

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