[geos-devel] Buffering Multipolygons

[Stephen Lime]

Sorry, not a regular  PostGIS user I'm afraid to say. Here's a simple 
WKT mutipolygon though:

   MULTIPOLYGON(((10 10, 10 20, 20 20, 20 15, 10 10)), ((60 60, 70 7, 80 
60, 60 60 )))

Steve

On May 17, 2005, at 2:47 PM, strk at refractions.net wrote:

> On Tue, May 17, 2005 at 06:05:50PM +0200, strk at refractions.net wrote:
>> On Tue, May 17, 2005 at 08:19:06AM -0500, Steve Lime wrote:
>>> What flavor of script or test data? Do you really want a 
>>> perl/mapscript
>>> script?
>>
>> No, just an .sql script containing table creation, data load (WKT 
>> geoms)
>> and the failing call to GeomUnion(). The dataset should be the
>> smallest possible reproducing the problem.
>
> Err.. sorry, the call is to buffer() not to GeomUnion,
> so a single command should be able to show the problem and let us
> test it on other versions.
> Something like:
>  select buffer('MULTIPOLYGON...', #);
>
> --strk;
>
>>
>> --strk;
>>
>>>
>>>>>> strk at refractions.net 05/17/05 1:33 AM >>>
>>> If you send a small script we can test it.
>>> --strk;
>>>
>>> On Tue, May 17, 2005 at 01:02:58AM -0500, Steve Lime wrote:
>>>> Hi All: I'm wondering if someone can confirm that buffering a
>>>> multipolygon works with GEOS 2.1.1. I'm testing my conversion code 
>>>> and
>>>> am having problems with just this case: simple polgons with/without
>>>> holes work fine, anything with multiple outer rings does not (bus
>>> error
>>>> on Mac OS). The conversion code must be close because computing a
>>> convex
>>>> hull on the same test shape works fine.
>>>>
>>>> I've attached a small graphic that shows the multipolygon (with GEOS
>>>> computed convext hull)...
>>>>
>>>> Steve
>>>
>>>
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>>>
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