On Sun, Dec 21, 2008 at 11:17 AM, <[email protected]> wrote: > My saying since 45. I have referred to two other networks which both are > 1000 times larger: > the road network, and the postal service network. None of them has this > crazy problem because none of them does user reachability information > dissemination. Let me point to a 3rd network: the railroad network. > There a single link (=railway between two distant cities) may take 10 years > building it.
Heiner, How do you select which train or flight you will take? When I select a train or flight, I have multiple considerations: 1. From the potentially viable destination stations, how convenient is the street-level route I've precomputed after acquiring a local map? If I take a cab, how much will the cab fare cost? Would it be cheaper to rent a car? 2. From the potentially viable source stations, how convenient is the street-level route from my current location? If I take a cab, how much will the cab fare cost? Would it be cheaper to pay for parking at the station? 3. Which trains or flights go to the stations in question during the period I want to travel? 4. Which train or flight is offered at a price I'm willing to pay? You'll notice that in order to take a single long trip, I've acquired a substantial subset of the routing data and applied a very complex set of heuristics in order to precompute my door-to-door route. And did I mention that the trains and aitlines are regularly bankrupt? It seems they have a helluva time managing their costs. Geographic routing for human travel may seem simple and efficient, but it only seems that way. Regards, Bill Herrin -- William D. Herrin ................ [email protected] [email protected] 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004 _______________________________________________ rrg mailing list [email protected] https://www.irtf.org/mailman/listinfo/rrg
