[pgrouting-users] weighted costs

[Stephen Woodbridge]

I regularly use costs for shortest time, shortest path, dynamically 
modify cost based traffic feeds and accident reports. Similar to 
accidents one could modify road outages because of mud slides, earth 
quakes, or flooding. We also have some users that are looking a flow 
analysis, so basically there are not any limitations that I can think 
of. We also support complex multi-edge turn restrictions using the TRSP 
code branch and in theory shooting star (but this is currently broken).

-Steve

On 3/17/2012 5:55 PM, pedrocostaarma at sapo.pt wrote:
> Thank you Steve.I understand the use of costs because i learn with
> arcgis in university. In knows days i introduce the open source software
> in my business.
> I am new with pg routing and i am modelling accessibility. I only like
> to know if exists more information or examples about costs with pg routing.
> Thanks for your explanation.
>
>
> Pedro Costa
> Enviado do meu Android
>
>
> Stephen Woodbridge escreveu:
>
> On 3/16/2012 8:12 AM, Pedro Costa wrote:
>  > Hello list,
>  >
>  > Does anybody know tutorial or more detailed information about the use of
>  > weighted costs?
>  > I only know that:
>  > http://workshop.pgrouting.org/chapters/advanced.html
>
> Cost is just a positive value (negative edge cost are not allow). You
> can use distance as a cost, or time as a cost, or turn angle as a cost,
> or anything you want that makes sense for what you are modelling. The
> issues is what are you modelling and and what do you want to take into
> account and can you model that factor as a cost or a component of the cost.
>
> For example, you could convert all costs into some increase number of
> seconds to traverse from node A to node B. then you could model the
> distance and average speed as time. If you had an attribute at a node
> the indicated a traffic light or stop sign, you could add some
> additional average wait time to the edges passing through that node. If
> you had an attribute say the road had lots of potholes, you could assume
> some lower average speed, etc.
>
> You have to transform the things you are modelling into some unit or
> unitless value as a cost.
>
> -Steve W
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