[pgrouting-users] ferry routes how to get?
woodbri at swoodbridge.com
Sun Mar 25 19:24:21 EDT 2012
On 3/25/2012 2:52 PM, mzetka3 at tlen.pl wrote:
> Welcome :) Is there any way to get ferry routes vector data betwen
> ports? For example route Ancora-Patra. Where i can find this data?
Well, if you can not find a shapefile you can probably get a schedule
for the various ferries you are interested and connect the roadways with
an edge between the various ports and set the cost to time/estimated
distance. If they run on a regular frequency of departure times you can
have 1/2 the time between departures to the travel time because on a
random sample the average wait time for the ferry will be 1/2 the time
between the departures. If you think people plan their route departure
to arrive nearer the departure time then you can narrow that window, but
you still have to assume that the if people get stuck in traffic or
whatever they may miss the ferry they were planning on an have to wait a
whole cycle for the next, so 1/2 the time is not a bad estimate.
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