> Naturally it would be great to be able to reproduce this in some kind of minimal sample, or at least find > out if the same operation also fails on *nix system.
Unfortunately it does not fail for a minimal sample. As I said in my response to Sean, reducing the number of points to approximately 2 million results in a cascaded joined polygon that returns a valid wkt and wkb string. Also, testing this section in its own isolated python script yielded a shapely object that was able to successfully return a wkt and wkb string. I am in agreement with Sean's comment that it is probably to do with GEOS not checking if the allocation of memory for the WKT value succeeded. Cheers Darren -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jaakko Salli Sent: Tuesday, 10 August 2010 4:18 AM To: gispython.org community projects Subject: Re: [Community] Access Violation Error when using to_wkt method Hi Darren, On 9.8.2010 4:18, Darren Waters wrote: > 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. > Naturally it would be great to be able to reproduce this in some kind of minimal sample, or at least find out if the same operation also fails on *nix system. Anyways, to rule out if this is a problem with the used compiler, here is a link to GEOS DLLs built with Visual C++ 7.1 (the same one used to build Python 2.5): http://personal.inet.fi/private/jmsalli/geos_x86_vc7.zip Just copy the files into your Python25\DLLs directory, and let us know if it works any differently. Thanks, Jaakko _______________________________________________ Community mailing list [email protected] http://lists.gispython.org/mailman/listinfo/community _______________________________________________ Community mailing list [email protected] http://lists.gispython.org/mailman/listinfo/community
