[pgrouting-dev] Re: Network Layering support

[Stephen Woodbridge]

The Robert Geisberger code can be licensed under a few different 
licenses, but that would need to be negotiated with them. At least it 
was my understanding that they also offer a commercial license for $$.

The algorithm is well documented in the various papers detailing it and 
it would not be hard to reconstruct code for the papers that would not 
be burdened by any license agreement. It would obviously take some time 
and effort and someone with the right technical background to understand 
the algorithm in enough detail to code it.

I think if you or the PSC approached them that we might be able to get 
them to allow us to relicense the code into something that would be 
favorable to postgresql license terms since this would get embedded in 
it depending on what terms we were requesting.

It doesn't hurt to ask!

-Steve

On 2/18/2011 8:57 PM, Daniel Kastl wrote:
> I may have written this already, but in case I didn't do yet:
> OpenTripPlanner also seems to have an implementation of CH:
> http://opentripplanner.org/browser/trunk/opentripplanner-routing/src/main/java/org/opentripplanner/routing/contraction
>
> Though their license is LGPL. How does this work?
> Because it's their own implementation?
> http://opentripplanner.org/browser/trunk/opentripplanner-routing/src/main/java/org/opentripplanner/routing/contraction/ContractionHierarchy.java#L66
>
> Daniel
>
> <http://opentripplanner.org/browser/trunk/opentripplanner-routing/src/main/java/org/opentripplanner/routing/contraction>
>
> 2011/2/19 Daniel Kastl <daniel at georepublic.de
> <mailto:daniel at georepublic.de>>
>
>     Hi Jay and Steve,
>
>     This email is getting very long, so I will shorten it a bit.
>
>
>
>                     * http://routingdemo.geofabrik.de/
>                     * http://sourceforge.net/projects/routed/
>
>                 It uses contraction hierarchies algorithm.
>
>
>
>             Thanks for the links. Are you certain that the above project
>             uses
>             contraction hierarchies algorithm by Robert Geisberger? I
>             went thru the
>             source, and they are using contraction, but I did not see
>             where they
>             have used the node ordering step as proposed in the CH
>             paper. I did not
>             find contraction hierarchies mentioned in their readme too:
>             http://sourceforge.net/apps/trac/routed/wiki/ReadMe
>
>
>         It is possible that they read the paper and made their own
>         implementation to avoid the AGPL license. The paper is describes
>         the algorithms in great detail, so I'm sure this is possible.
>
>
>     The notice I read through Twitter:
>     http://twitter.com/#!/geofabrik/status/38579590834159616
>     According to this is uses CH. And the license is AGPL as well.
>
>
>                  If we are using the code already made available thru
>             AGPL (I dont
>             understand the intricacies of different licences) by Robert
>
>
>         I think we need to read and understand the AGPL license and how
>         it might impact on the current license. These are tricky issues
>         and it might prohibit us from including their code directly.
>
>         If we wanted to do that we could still use the AGPL code to
>         build test model that would allow us to validate the our code
>         was getting reasonable results.
>
>
>     As far as I understand AGPL is more strict than GPL in terms of
>     services delivered with this software. So if you offer a routing
>     service with this software, you need to also give access to the
>     source code to the users of this service (GPL licensed software only
>     cares about the software you pass to someone).
>     This is probably something that not every pgRouting user would be
>     happy with.
>
>     Daniel
>
>
>     --
>     Georepublic UG & Georepublic Japan
>     eMail: daniel.kastl at georepublic.de <mailto:daniel.kastl at georepublic.de>
>     Web: http://georepublic.de <http://georepublic.de/>
>
>
>
>
> --
> Georepublic UG & Georepublic Japan
> eMail: daniel.kastl at georepublic.de <mailto:daniel.kastl at georepublic.de>
> Web: http://georepublic.de <http://georepublic.de/>
>
>
>
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