Stephen Woodbridge wrote:
Nandorov wrote:
can i block some segments? for example cad gives the posibility to put
a max
resistance value, let's say it's 100. So if the resistance of your
segment
is 100 that segment is blocked and you cannot go thorught this way. if
this
possible with pgrouting?
Yes you can put a high cost on a segment and then it will search for a
lower cost alternative soultion. In routing you can also have a reverse
cost that is the cost to traverse the segment from end to start as
opposed to the cost which is for traversing from start to end. You can
also just have a single cost that is good for either directions. We use
high costs to prevent routing the wrong way down one way streets.
Routing solutions from a single best path. There exist different network
analysis algorithms for doing things like water flow analysis and things
like that.
To clarify this should have said:
Routing solutions form a single best path. There exist different network
analysis algorithms for doing things like water flow analysis and things
like that, but pgRouting does not support these.
-Steve W.
-Steve W
thanks!
Stephen Woodbridge wrote:
Nandorov wrote:
hi,
i've tried pgrouting algorithms and works pretty well. However, i dont
know
exactly the way they applied "the resistance" of a way (represented
by a
multilinestring). has someone worked with pgrouting before? and
know if
i
can modify their algorithms to adapt them to my requirements?
thanks
"the resistance" is applied as a "cost" to traverse the segment. All
cost must be positive. You can use length of the segment as cost for
shortest distance. or you can compute and assign a cost value based
on other attributes.
-Steve
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