hi my search for libgeos showed that I have three versions on my machine
libgeos-3-0-0.dll is the only one included in the python path
the other two versions are
libgeos-2.dll and libgeos_c-1.dll which are part of Quantum GIS
any ideas as to how I can get a hold of libgoes-3-0-0-1??
bearing in mind I an using shapely-1.0.12
thanks
dan
> From: [email protected]
> To: [email protected]
> Date: Fri, 31 Jul 2009 09:54:12 +0200
> Subject: Re: [Community] buffer problem
>
> Search for libgeos SO or DLL files on your system. If you're using an
> older version like 2.2.3, it's very possible that you've found a GEOS
> bug.
>
> Sean
>
> On Jul 30, 2009, at 5:06 PM, Daniel O'donohue wrote:
>
> > I'm not sure how to find out what version of GEOS I'm using
> > but I have deleted the shapely module and reinstalled it using the
> > latest
> > version.
> > after that I also run a copy of your code
> >
> > from shapely.geometry import MultiPoint
> > polya = MultiPoint([(-1.0, -2.0), (1.0, -2.0), (-1.0, 2.0),
> > (1.0,2.0)]).convex_hull
> > polyb = MultiPoint([(-1.0, -2.0), (1.0, -2.0), (-1.0, 2.0),
> > (1.0,2.0)]).convex_hull
> > buffa = polya.buffer(1.0)
> > buffb = polya.buffer(1.0)
> >
> > print buffa.contains(polya)
> >
> > print buffb.contains(polya)
> >
> > print buffb.contains(polyb)
> >
> > print buffa.contains(polyb)
> >
> > print polya.equals(polyb)
> >
> > which produces the following
> >
> > False
> > False
> > False
> > False
> > True
> >
> > I'm stuck
> >
> > cheers
> > dan
> >
> >
> > > From: [email protected]
> > > To: [email protected]
> > > Date: Thu, 30 Jul 2009 14:11:11 +0200
> > > Subject: Re: [Community] buffer problem
> > >
> > > On Jul 28, 2009, at 8:55 PM, Daniel O'donohue wrote:
> > >
> > > > hi there
> > > >
> > > > I'm am trying to use the following algorthyim to test to see if
> > two
> > > > geometries match
> > > >
> > > > Geometry A matches geometry B if
> > > > A is contained in buffer(B, d)
> > > > and B is contained in buffer(A, d)
> > > > and boundary(A) is contained in buffer(boundary(B), d)
> > > > and boundary(B) is contained in buffer(boundary(A), d)
> > > >
> > > >
> > > >
> > > > polya = MultiPoint([(-1.0, -2.0), (1.0, -2.0), (-1.0, 2.0), (1.0,
> > > > 2.0)]).convex_hull
> > > > polyb = MultiPoint([(-1.0, -2.0), (1.0, -2.0), (-1.0, 2.0), (1.0,
> > > > 2.0)]).convex_hull
> > > >
> > > > buffa = polya.buffer(1.0)
> > > > buffb = polya.buffer(1.0)
> > > >
> > > > polya_bound = polya.boundary
> > > > polyb_bound = polyb.boundary
> > > >
> > > >
> > > > print buffa.contains(polyb)
> > > > print buffb.contains(polya)
> > > > print buffa.contains(polyb_bound)
> > > > print buffb.contains(polya_bound)
> > > >
> > > >
> > > > I use a convex hull to ensure that the polygon created is only
> > > > considering the outside points
> > > > and my points are not ordered so this ensures that I valid polygon
> > > > is returned
> > > >
> > > > How ever the last four print statments return
> > > >
> > > > False
> > > > False
> > > > True
> > > > True
> > > >
> > > > both geometries are identical so why would the buffer of one not
> > > > contain the either one of the
> > > > original geometires??
> > > >
> > > > I am really studk here and would be greatfull for any help
> > > >
> > > > cheers
> > > >
> > > > dan
> > >
> > > Hi Dan,
> > >
> > > I can't reproduce this problem. Here's what I get, using Shapely
> > > 1.0.12 and GEOS 3.1.0:
> > >
> > > >>> from shapely.geometry import MultiPoint
> > > >>> polya = MultiPoint([(-1.0, -2.0), (1.0, -2.0), (-1.0, 2.0),
> > (1.0,
> > > 2.0)]).convex_hull
> > > >>> polyb = MultiPoint([(-1.0, -2.0), (1.0, -2.0), (-1.0, 2.0),
> > (1.0,
> > > 2.0)]).convex_hull
> > > >>> buffa = polya.buffer(1.0)
> > > >>> buffb = polya.buffer(1.0)
> > > >>> buffa.contains(polya)
> > > True
> > > >>> buffb.contains(polya)
> > > True
> > > >>> buffb.contains(polyb)
> > > True
> > > >>> buffa.contains(polyb)
> > > True
> > > >>> polya.equals(polyb)
> > > True
> > >
> > > What's your GEOS version?
> > >
> > > Sean
> > >
> > > _______________________________________________
> > > Community mailing list
> > > [email protected]
> > > http://lists.gispython.org/mailman/listinfo/community
> >
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> --
> Sean Gillies
> Programmer
> Institute for the Study of the Ancient World
> New York University
>
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