[Community] Access Violation Error when using to_wkt method

[Darren Waters]

Hi Sean,

Thanks for your reply.  My version of Shapely came from the link on
http://trac.gispython.org/lab/wiki/Shapely.  My version of python is 2.5.2
and was from python.org.  Also, when I referred to a large set of point
data, I am talking of the order of 6 million points that I am performing the
cascaded union on.

Thanks in advance for any advice that you can give me.

Cheers
Darren


-----Original Message-----
From: community-bounces at lists.gispython.org
[mailto:community-bounces at lists.gispython.org] On Behalf Of Sean Gillies
Sent: Saturday, 7 August 2010 1:35 PM
To: gispython.org community projects
Subject: Re: [Community] Access Violation Error when using to_wkt method

On Wed, Aug 4, 2010 at 12:02 AM, Darren Waters
<darren at omc-international.com> wrote:
> Hi All,
>
> I am using shapely 1.2.2 (python 2.5 on a Windows system) to generate 
> a coverage polygon for a large set of point data.  To achieve this I 
> am producing a series of square polygons (buffered around each point) 
> and then using a cascaded_union to join overlapping geometries to 
> yield a multipolygon object. Unfortunately, when I try and output this 
> geometry to a well known text representation, using the to_wkt() 
> method, I get an error
> (*** WindowsError: exception: access violation reading 0x00000000).  
> Has anyone else experienced this problem and can anyone suggest a
solution.
> This problem seems like it may be related to an issue discussed on the 
> geos-devel list
> (http://www.mail-archive.com/geos-devel@lists.osgeo.org/msg00996.html)
>
> Thanks
> Darren

Hi Darren,

Aron's patch has been in Shapely for some time. Where did your Windows
Python come from? Python.org? Elsewhere?

--
Sean
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