I get this error message when executing your code:
ERROR:shapely.geos:TopologyException: depth mismatch at at
581037.39250326285 4509301.9737485535
Have no idea what this means, but maybe you know))
Cheers
2014-04-28 14:55 GMT-04:00 Alex Flint <alex.fl...@gmail.com>:
> The following code produces an exception under shapely (python version)
> 1.3.0
>
> import shapely.geometry
> path = shapely.geometry.LineString([
> [581037.19575668662, 4509299.98342364],
> [580996.61134201661, 4509304.202782942],
> [581037.19575668662, 4509299.98342364],
> [581072.19594137045, 4509296.7024005251],
> [581072.19594137045, 4509296.7024005251],
> [581037.19575668662, 4509299.98342364]
> ])
> path.parallel_offset(2, shapely.geometry.JOIN_STYLE.mitre)
>
> The exception is:
>
> File
> "/Users/alexflint/Code/wifi-localization/tools/localization/estimation/scripts/shapely_bug.py",
> line 39, in <module>
> linestring.parallel_offset(2, shapely.geometry.JOIN_STYLE.mitre)
> File
> "/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/shapely/geometry/linestring.py",
> line 114, in parallel_offset
> bool(side == 'left')))
> File
> "/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/shapely/geometry/base.py",
> line 55, in geom_factory
> raise ValueError("No Shapely geometry can be created from null
> value")
> ValueError: No Shapely geometry can be created from null value
>
> The points on the path above are actually very close to collinear, but my
> understanding was that parallel_offset should work regardless. I have
> attached a plot of the path itself.
>
> Any suggestions for what's going on here?
>
> Alex
>
>
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--
Sasha
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