[Community] confusion with convex hull w/ shapely

[Sean Gillies]

Ah. And it turns out that the bug fix I was talking about concerned  
polygon exteriors (rings) being returned as linestrings. Disregard my  
previous post.

On Mar 26, 2010, at 9:21 PM, Kurt Schwehr wrote:

> This is libgeos 3.2.0 and shapely 1.0.14 and 1.0.15.
>
> -kurt
>
>
> On Mar 26, 2010, at 3:55 PM, Sean Gillies wrote:
>
>> Kurt,
>>
>> A non-closed line segment has a boundary equal to a set of two  
>> points. Linear rings (such as a polygon's boundary) don't have  
>> boundaries. That's part of the definition of being a closed curve.  
>> You're looking at a GEOS bug in which polygon boundaries are  
>> returned as linestrings instead of rings. IIRC, Charlie Savage and  
>> I closed that before the 3.0 release. Are you using a very old GEOS?
>>
>>
>
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--
Sean