Problem routing to location from various starting points

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Problem routing to location from various starting points

Postby AlanOfTheBerg » Thu Dec 22, 2011 7:59 pm

I've been working on an update request for a few weeks. The testing process is slow due to the infrequent map updates. But now I'm stuck and I can't figure out if there is something with the map, or if this is an issue with the routing server.

The Destination point is Shore Acres State Park, OR. LiveMap will recognize this as a valid end point.

For the start point, using the click "Set as Origin" method, I can get it to route from some locations along "W 11th Ave" in this view, especially westerly, near the intersection with Beltline Rd.

I can also get it to route OK from various locations along Beltline Rd itself in this view, but typically only those on the southern part. As you get north where Beltline turns east-west, the routing starts to fail.

FYI, this is the location of the error report. At first I thought it was a segment-end node missing problem, but testing reveals that routing works from some various, seemingly random locations around the city of Eugene.

I also thought it was lack of highway/major roads, but Beltline Rd has always been a minor, so that isn't the case there.

I can't figure this one out, so any ideas would probably help. Thanks!
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Re: Problem routing to location from various starting points

Postby AlanOfTheBerg » Thu Dec 22, 2011 8:54 pm


Not sure what you're referring to. I get "Could not find route" using your link.
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Re: Problem routing to location from various starting points

Postby AlanOfTheBerg » Thu Dec 22, 2011 9:00 pm

bgodette wrote:Try it a few more times, it'll give a route through Albany.

:lol: That's awesome. Since it will give one reasonable route from there through Eugene, it should be able to route through all sorts of places within Eugene, but it doesn't. It's frustrating.
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Re: Problem routing to location from various starting points

Postby AlanOfTheBerg » Thu Dec 22, 2011 9:20 pm

bgodette wrote:Also what are the sensible routing choices, just the basic overview like which cities it should go through and such.

The only reasonable routes from Eugene as a whole are OR126. If you further north, nearer Junction City on OR99W, OR36 is also a reasonable route. Either way, you end up going through Florence. But it should definitely find routes within Eugene to get out to Beltline or W 11th, which becomes OR126.
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Re: Problem routing to location from various starting points

Postby AlanOfTheBerg » Fri Dec 23, 2011 3:47 pm

You bring up good points, for sure. I don't understand the routing algorithms details, so you could be totally on point. When I get to these state routes in my progress through all of them (still doing US routes right now), I'll concentrate on them more.

FYI, did you notice that the most updated layer on the US livemap is no longer the closest zoom level, but one higher than that?
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Re: Problem routing to location from various starting points

Postby AlanOfTheBerg » Mon Jan 23, 2012 11:54 pm

I heard back from Support today and they have fixed the problem with this routing. The reason for not being able to find a route, according to Dror, is interesting and now I need to get some help from the megamappers in terms of what you remember from the meetup about route pruning, road type preferences for route distance, etc. I haven't gotten that part in my recording, so I don't have notes about it yet.

Basically the issue was that the short route (going south and then West) is built of mainly Seconday highway, and since this goes for almost the entire route, waze tried to avoid it and find an alternative - however, the alternative (Which is currently displayed when you search for it) is a very long one and so it failed to find an alternative and this failed the entire search. We fixed it now.


(I also don't know what was "fixed": roads or routing server?)
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Re: Problem routing to location from various starting points

Postby AlanOfTheBerg » Tue Jan 24, 2012 4:17 am

FrisbeeDog wrote:Agree on the minor/major highway designation based on use rather than state/US. It just needs to be clearly laid out in the wiki what delineates the two.

The dozen+ threads with everyone debating on how to do this shows how much differentiation of opinion the community has on this. :)
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Re: Problem routing to location from various starting points

Postby AlanOfTheBerg » Tue Jan 24, 2012 5:47 pm

More from Dror, after I asked if there was a map problem or if this was a routing server parameter change:
Basically, the parameter says to ignore an alternative due to a couple of reasons. Everything is based on theresholds, and in this case, the threshold for driving on freeway vs. driving on lower-speed roads caused the issue, so we changed it and made sure it will not fail the whole route.

So it wasn't road type so much as road speed which caused the routes to be "pruned" or "failed."
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Re: Problem routing to location from various starting points

Postby bgodette » Thu Dec 22, 2011 8:48 pm

This looks really messed up

I haven't looked yet, but hopefully it isn't going to require going along every junction in the route and restricting all turns and re-enabling.
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Re: Problem routing to location from various starting points

Postby bgodette » Thu Dec 22, 2011 8:56 pm

AlanOfTheBerg wrote:

Not sure what you're referring to. I get "Could not find route" using your link.

Try it a few more times, it'll give a route through Albany.
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