#3030: v. generalize fails to generalize polygons in a random manner
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Reporter: dido | Owner: grass-dev@…
Type: defect | Status: new
Priority: major | Milestone: 7.0.5
Component: Vector | Version: 7.0.4
Resolution: | Keywords: v.generalize
CPU: x86-64 | Platform: MSWindows 7
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Comment (by mmetz):
Replying to [comment:8 dido]:
> Hi,
>
> the reason why non-generalized polygons appear in the output is
certainly clear. My point is that none of these polygons will be damaged
due to generalization over-simplification, so I suspect a v.generalize
algorithm problem here.
>
> As an example find attached 4 pairs of shapefiles that produce non-
simplified polygons.
I modified v.generalize a bit in my local copy to write out those modified
boundaries that would damage topology. In each of your test cases.
v.generalize is correct in not generalizing these boundaries. They would
collapse to a point, intersect with themselves, intersect with another
boundary, or produce a zero-size area. See screenshots in attached
topo_errors.zip.
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Ticket URL: <https://trac.osgeo.org/grass/ticket/3030#comment:9>
GRASS GIS <https://grass.osgeo.org>
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