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2answers
101 views

Getting the outer boundary of a group of polygons

I have an issue where I have feature classes of groups of zip codes in different sectors of the US that I have created. I want to be able to define the outer boundary of these groups so I can create a ...
1
vote
4answers
283 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
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0answers
57 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 ...
1
vote
1answer
135 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 ...