Shortest Path

[Alejandro Guzman]

Hi Trevor,

Thanks for your quickly response. I continued investigating about other
transportation problems that I want to solve and show in MapGuide, and I
concluded that I must develop a module to manipulate topologies into
MapGuide in order to solve this and other transportation problems. I
recognize that it involves a lot of work and theoretical acknowledge, but if
I can solve this it could be a contribution to MapGuide Open Source or to a
Plug-in of Mapguide Enterprise. Therefore, now my questions are the
following:

 Can the manipulation of topologies into MapGuide be solved by means of ASPX
pages?

 Could this solution serve for MapGuide Open Source and Mapguide Enterprise?


Thanks

 Alejandro Guzmàn

On 10/3/06, Trevor Wekel <trevor.wekel at autodesk.com> wrote:
>
>  Hi Alejandro,
>
> Yes.  You could implement a shortest path command as a C# aspx web page.
> This page could then be called from a web application similar to the
> existing buffer.aspx script.  MapGuide does not currently support topology
> so you would have to create the topology out of the raw geometry before
> running the shortest path algorithm.
>
> Here is a general outline:
>
> Select the features of interest using FeatureService::SelectFeatures()
> Iterate through the features recording the end points and identity
> properties
> Using some heuristics, iterate through the end points to determine which
> "touch" and create the network topology.  An intersects call with a small
> circle around each end point may be appropriate.
> Using the network topology, determine the shortest path.
> Using the identity properties for the shortest path features, highlight
> the shortest path using a technique similar to measure.aspx
>
>
> This algorithm could also be coded in C++.  A C++ version would be faster
> but also more difficult to implement.
>
>
> Thanks,
> Trevor
>
>
>  ------------------------------
> *From:* Alejandro Guzman [mailto:lguzmanc at gmail.com]
> *Sent:* Tuesday, October 03, 2006 9:56 AM
> *To:* users at mapguide.osgeo.org
> *Subject:* Shortest Path
>
>  Hello
>
> Nowadays I am evaluating some Internet Map Servers to use one of them in a
> project. Till now, due to diverse benefits that this one offers, I have
> decided on MapGuide Open Source, nevertheless even I do not still have
> totally cleared some questions. Specifically my questions are directed to:
>
>
>
> Can I create a new command to find shortest path?
>
> If it is true, can I programme it with C#?
>
> Or would I have to modify to the source code of Mapguide to do this, and
> therefore use a specific language of programming?
>
> Do solutions exist type plug-in to find the shortest path with mapguide?
>
>
>
> Thanks
>
> Alejandro Guzmán
>
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