Hi Laura please keep exchanges on the email list; I work for a company which
among other things offers commercial support for teams working with these
products. While I can answer a few questions on the user list; I need to make
sure private email/assistance is focused on my customers.
If you are interested in such things there is a page in the wiki on support
options including commercial support.
Can you please go through the links I provided (including the one on graph) I
think it will answer your questions; it will take you a couple of hours to go
through it as it is not a tutorial on example code. I think when you do you
will see what I mean by graph; ie an in memory graph data structure (as in your
graph theory course).
Some of the algorithms in that module were donated to the project by grad
students such as yourself.
Cheers,
Jody
On 05/06/2010, at 9:52 AM, laura siewe wrote:
> Hello world
>
> I drew a map using the PostGIS database. Now I would like to apply the module
> Djisktra and I wonder if when we talk about graph it refers to the map.
> Otherwise how can we match a graph to a map.
>
> Laura Siewe
>
> De : Jody Garnett <[email protected]>
> À : laura siewe <[email protected]>
> Cc : [email protected]
> Envoyé le : Ven 4 juin 2010, 8h 50min 42s
> Objet : Re: [Geotools-gt2-users] please help!
>
> If your data is already in postgres you may wish to use pgRouting.
>
> The graph module in geotools has a section in the user guide. If you are
> willing to load your data into memory you may wish to use the normal geotools
> featuresource api to access the information out of PostGIS, load it into a
> graph, and then use the graph to perform a shortest route calculation.
>
> Can you try the following:
> 1. review how to connect to postgis and read features
> - http://geotoolsnews.blogspot.com/2009/11/foss4g-geotools-tutorials.html
> 2. review how to load features into a graph
> - http://docs.codehaus.org/display/GEOTDOC/Graphs
> 3. review how to perform a shortest path
> - http://docs.codehaus.org/display/GEOTDOC/Graphs
>
> Jody
>
> On 04/06/2010, at 4:23 PM, laura siewe wrote:
>
>> Hello world.
>>
>> I am currently doing my graduation project which is to create a navigation
>> system with search of the optimal path. I used the tool mapnik and PostGIS
>> database to generate a map. I am very interested in the implementation of
>> Djikstra when using Geotools but I confess I do not know how to use it in
>> my case.
>>
>> How can we interact with the PostGIS database where all data generated map.
>>
>> Pending your response, receive express my deepest respect.
>>
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>
>
>
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