[GRASS-user] Vector smoothing (polygons): topology/geometry problems

GRASS GRASS user
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1

Dear all,

I performed a raster segmentation from a Spot6 satellite image with OTB. I polygonized/vectorized this raster segmentation in order to get a vector file. To limit the pixelation of this cover, I was thinking of smoothing the layer with the QGIS tool. This works, but the problem is that it generates topology/geometry issues (overlap, holes, etc.). And I can’t afford to have invalid geometries. Could you share some advices? Guidances in order to skip those problems? I’ve attached a screenshot of the smoothed vector segmentation.

Thanks so much.

image001.png919×552 5.78 KB

2

Did you try the grass smoothing tool, v.generalize?

3

You may consider to vectorize it in GRASS directly, then no such problems as GRASS is a topological GIS.

Otherwise, there are topology cleaning tools, see:
https://grasswiki.osgeo.org/wiki/Vector_topology_cleaning