[pgrouting-users] weighted costs
woodbri at swoodbridge.com
Fri Mar 16 09:16:44 EDT 2012
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:
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.
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