[geos-devel] Re: geos-devel Digest, Vol 78, Issue 7

Fri Apr 10 04:35:42 EDT 2009

Hello everyone,
I have a question about GEOSUnion().
I give value to g1 and g2 like below:
GEOSGeom g1 = "POLYGON ((1  3, 1  3, 1  6, 1  6, 1 3))"  and GEOSGeom g2 =
"POLYGON ((1  3, 1  3, 1  6, 1  6, 1 3))"  , but if I make union operation
like GEOSGeom g3 =
GEOSUnion(g1, g2), it give me result like "GEOMETRYCOLLECTION EMPTY".
Does anyone can tell me why?


2009/4/10 <geos-devel-request at lists.osgeo.org>

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> Today's Topics:
>
>   1. Re: Boost License compatibility (Mateusz Loskot)
>   2. Re: Boost License compatibility (Paul Ramsey)
>   3. Re: Boost License compatibility (Mateusz Loskot)
>   4. Re: Boost License compatibility (Greg Troxel)
>   5. Re: Boost License compatibility (Mateusz Loskot)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 08 Apr 2009 22:20:56 +0100
> From: Mateusz Loskot <mateusz at loskot.net>
> Subject: Re: [geos-devel] Boost License compatibility
> To: GEOS Development List <geos-devel at lists.osgeo.org>
> Message-ID: <49DD1538.6050707 at loskot.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Paul Ramsey wrote:
> > Since you're talking about taking a small snippet of LGPL and putting
> >  it into a larger chunk of Boost, probably you will get no definitive
> >  answer, since it hinges on whether your new combined result is a
> > "derived work" (in which case it's LGPL) or not (in which case it can
> >  be Boost).  The "safe" black-and-white answer is that combining
> > anything from a *GPL project with another compatibly-licensed project
> >  creates a *GPL resultant.
>
> All this makes sense and seems to be best approach. Thanks!
>
> Slightly changing my original question.
> Let's assume no code is copied.
> Is it safe to "translate" or let's say rewrite some parts of
> implementation of algorithms available in GEOS, using different
> types, different idioms, different C++ constructions, etc.
> and license such work under the terms of Boost License?
>
> Best regards,
>
> p.s. I understand that the best answer is
> probably "Ask your lawyer!", so sorry for bothering
> if it's OT here.
>
> --
> Mateusz Loskot, http://mateusz.loskot.net
> Charter Member of OSGeo, http://osgeo.org
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 8 Apr 2009 14:31:55 -0700
> From: Paul Ramsey <pramsey at opengeo.org>
> Subject: Re: [geos-devel] Boost License compatibility
> To: GEOS Development List <geos-devel at lists.osgeo.org>
> Message-ID:
>        <30fe546d0904081431h5cc15325kd478fb7abc81e6b at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Definitely an "ask your lawyer". Our feeling when porting JTS to C++
> was that the port was still a "derived work" and should retain the
> LGPL license of the original work. However, that was merely a feeling,
> I have no idea where the grey areas lie in things like algorithm
> porting.
>
> P.
>
> On Wed, Apr 8, 2009 at 2:20 PM, Mateusz Loskot <mateusz at loskot.net> wrote:
> > Paul Ramsey wrote:
> >> Since you're talking about taking a small snippet of LGPL and putting
> >>  it into a larger chunk of Boost, probably you will get no definitive
> >>  answer, since it hinges on whether your new combined result is a
> >> "derived work" (in which case it's LGPL) or not (in which case it can
> >>  be Boost).  The "safe" black-and-white answer is that combining
> >> anything from a *GPL project with another compatibly-licensed project
> >>  creates a *GPL resultant.
> >
> > All this makes sense and seems to be best approach. Thanks!
> >
> > Slightly changing my original question.
> > Let's assume no code is copied.
> > Is it safe to "translate" or let's say rewrite some parts of
> > implementation of algorithms available in GEOS, using different
> > types, different idioms, different C++ constructions, etc.
> > and license such work under the terms of Boost License?
> >
> > Best regards,
> >
> > p.s. I understand that the best answer is
> > probably "Ask your lawyer!", so sorry for bothering
> > if it's OT here.
> >
> > --
> > Mateusz Loskot, http://mateusz.loskot.net
> > Charter Member of OSGeo, http://osgeo.org
> > _______________________________________________
> > geos-devel mailing list
> > geos-devel at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/geos-devel
> >
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 08 Apr 2009 22:41:16 +0100
> From: Mateusz Loskot <mateusz at loskot.net>
> Subject: Re: [geos-devel] Boost License compatibility
> To: GEOS Development List <geos-devel at lists.osgeo.org>
> Message-ID: <49DD19FC.7010107 at loskot.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Paul Ramsey wrote:
> > Definitely an "ask your lawyer". Our feeling when porting JTS to C++
> > was that the port was still a "derived work" and should retain the
> > LGPL license of the original work. However, that was merely a feeling,
> > I have no idea where the grey areas lie in things like algorithm
> > porting.
>
> Right, I have similar feeling.
>
> Thanks for help!
>
> Best regards,
> --
> Mateusz Loskot, http://mateusz.loskot.net
> Charter Member of OSGeo, http://osgeo.org
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 08 Apr 2009 18:02:48 -0400
> From: Greg Troxel <gdt at ir.bbn.com>
> Subject: Re: [geos-devel] Boost License compatibility
> To: GEOS Development List <geos-devel at lists.osgeo.org>
> Message-ID: <rmiocv6ajnb.fsf at fnord.ir.bbn.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Mateusz Loskot <mateusz at loskot.net> writes:
>
> > The question is like this:
> >
> > Can I copy lines 10-30 from GEOS source file a.cpp to project X which
> > is licensed under the terms of Boost License?
>
> If those lines are deemed to be non-trivial - and the rule of them is
> that 10 or more lines are definitely non-trivial - then no, because you
> have a derived work and can't distribute the LGPL code under the Boost
> License.  If you read one line and write something to do a similar
> algorithm but differently, almost certainly it's not a derived work and
> the licnense of the inspirational work doesn't matter.  The middle
> ground is hard and standard advice is not to skate near the edge of thin
> ice.
>
> > There is an existing code, project X licensed under Boost License.
> > If I copy some work based on LGPL and include it in the X,
> > can I still distribute X under the terms of Boost License?
>
> Definitely not.
>
> >> It's pretty clear the boost people would reject including LPGL code
> >> in boost, if that's what you are asking.
> >
> > And this is something that is not clear or better, not obvious to me.
>
> >From reading their analysis of licenses, it seems clear to me that Boost
> wants to allow proprietary use of boost.  This is the same licensing
> goal as the BSDs, and it's different from the FSF goal.
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> ------------------------------
>
> Message: 5
> Date: Wed, 08 Apr 2009 23:43:41 +0100
> From: Mateusz Loskot <mateusz at loskot.net>
> Subject: Re: [geos-devel] Boost License compatibility
> To: GEOS Development List <geos-devel at lists.osgeo.org>
> Message-ID: <49DD289D.7070901 at loskot.net>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Greg Troxel wrote:
> > Mateusz Loskot <mateusz at loskot.net> writes:
> >
> >> The question is like this:
> >>
> >> Can I copy lines 10-30 from GEOS source file a.cpp to project X which
> >> is licensed under the terms of Boost License?
> >
> > If those lines are deemed to be non-trivial - and the rule of them is
> > that 10 or more lines are definitely non-trivial - then no, because you
> > have a derived work and can't distribute the LGPL code under the Boost
> > License.  If you read one line and write something to do a similar
> > algorithm but differently, almost certainly it's not a derived work and
> > the licnense of the inspirational work doesn't matter.  The middle
> > ground is hard and standard advice is not to skate near the edge of thin
> > ice.
>
> Yes, this is best recommendation.
>
> >>> It's pretty clear the boost people would reject including LPGL code
> >>> in boost, if that's what you are asking.
> >> And this is something that is not clear or better, not obvious to me.
> >
> > From reading their analysis of licenses, it seems clear to me that Boost
> > wants to allow proprietary use of boost.  This is the same licensing
> > goal as the BSDs, and it's different from the FSF goal.
>
> Right, good point.
>
> Thanks to all for help in understanding the issue!
>
> Best regards,
> --
> Mateusz Loskot, http://mateusz.loskot.net
> Charter Member of OSGeo, http://osgeo.org
>
>
> ------------------------------
>
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> End of geos-devel Digest, Vol 78, Issue 7
> *****************************************
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