Andy Robinson (blackadder-lists) schrieb: > David Groom wrote: >> Sent: 01 September 2008 11:59 PM >> To: talk@openstreetmap.org >> Subject: Re: [OSM-talk] ferry route speed >> >> >> ----- Original Message ----- >> From: "Gervase Markham" <[EMAIL PROTECTED]> >> To: <talk@openstreetmap.org> >> Sent: Monday, September 01, 2008 9:34 PM >> Subject: Re: [OSM-talk] ferry route speed >> >> >>> David Groom wrote: >>>> When tagging ferry routes is anyone tagging ferry speed, and if so do >>>> you >>>> simply add maxspeed = ?? to thr route? >>> maxspeed is for speed limits. Unless the coastguard has imposed one, >>> please don't use that tag :-) If it's a particular single route, why not >>> "time" or "duration"? >> I have no particular views either way, just that as maxspeed was already in >> use I thought that routing applications would understand it, whereas >> another >> tag such as "time" or duration" would mean routing applications having to >> adapt to this. >> >> Having said that its much easier to know the time a ferry crossing takes >> rather than work out the speed of the crossing > > Yes, best not to try to be too smart. If the ferry has a scheduled departure > and arrival time the crossing_duration= should be good enough. The speed can > be worked out by computation in the routing app.
In many cases you need to consider ferris timetables. Some ferris also have check in or check out times. crossing_duration= is in those cases a valuable information, but does nor say anything about the travel time in total. Same goes for river crossing ferris. Some of them operate only at certain times of a day, and they will only cross the river if there is need for or if they have a minimum load, lets say 2 or 3 cars. In other cases we could find also trains or other means of transport to bring a car from a to b. We should consider them to in some way. Thorsten. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
