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1
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4answers
143 views

How to unpolygonize and remove outermost border?

QGIS has "polygon to line" but this isn't exact reverse engineering of "line to polygon". I want no overlapped border closed lines, just segmented (on each intersected point) lines. Additionally I ...
0
votes
0answers
53 views

QGIS: (Shapefile) Convert rings to fake-rings?

I hope I can make my question I posted yesterday clearer... sorry! Basically, I want to obtain the opposite of this: How to convert fake donut holes in polygons to real ones? Such polygons will ...
0
votes
0answers
19 views

QGIS: how to convert vector (shapefile)geometry to have no rings? [duplicate]

This is a difficult one I think. I'm trying to get a polygon geometry out of OSM coastline data converted to a shapefile of "water polygons". This polygons contain rings, (e.g. an island completely ...
1
vote
1answer
108 views

OGR UnionCascaded gives strange lines (flat polygons)

I'm using OGR to perform a union using UnionCascaded. All my polygons have been created by GDAL polygonize which ensures that all polygons follow pixel edges and should therefore align nicely. But I ...