Viaducts

Alex_McKee · 2009-09-05T22:31:04.000Z

Are viaducts rendered on the mapnik layer?
I added one but it doesn’t appear to have rendered.

DaveF · 2009-09-06T00:26:50.000Z

Alex McKee:

Are viaducts rendered on the mapnik layer?
I added one but it doesn’t appear to have rendered.

Unfortunately no, nor in Osmarender. Neither does bridge=aqueduct
but I’ve been told that bridge=swing does.

Dave F.

Alex_McKee · 2009-09-06T01:01:39.000Z

Cheers for that. I can confirm that swing bridges do indeed render, or at least did the last time I checked. I’ve added several of those.
Shame about viaducts and aqueducts.

Vclaw · 2009-09-06T01:26:23.000Z

Just done a bit of checking (with Mapnik):
It seems bridge=viaduct and bridge=swing (or bridge=anything else?) renders for highways, but not for railways.
But bridge=yes is the only bridge that renders for railways.

And bridge=aqueduct is rendered for waterways (or highways).

Alex_McKee · 2009-09-06T01:35:01.000Z

Aaah, very interesting. Given that railways are some of the most prevalent uses of viaducts it’s a bit weird. I’ll do a little digging and see if there’s a reason but otherwise I’ll create an ticket on Trac about it. Thanks very much for the extra info.

Ldp · 2009-09-06T12:24:04.000Z

Alex, please do create the ticket.

I modified (many, but not all) highway bridges a while back to render bridge=, so it catches swing, draw, viaduct and anything else. Yes, even bridge=no renders as bridge.

bridge=aqueduct renders for waterway=canal. If there actually are other types of waterway with aqueducts, be welcome to point them out and we can modify that.

Alex_McKee · 2009-09-06T23:04:00.000Z

I’ve created the ticket and linked back to this discussion. Many thanks for all the information.

DaveF · 2009-09-07T00:18:40.000Z

Vclaw

You’re correct. I was told it didn’t, but didn’t check for myself. Ta

Ldp

Could you clarify your post please, I’m a bit confused by it?

“I modified (many, but not all) highway bridges” - All or just the ones you’ve mapped?

“bridge=” - Sorry, what is ? Do you mean bridge=yes? isn’t that the way to catch all?

“even bridge=no renders as bridge” - Is there purpose for this?

Thanks
Dave F.

Ldp · 2009-09-07T17:51:04.000Z

@DaveF: The clue is in the 2nd part of the sentence: “to render”. Okay, could be a bit more verbose, granted.

What I meant was that I updated the mapnik style to render more bridges for most highways. is whatever value you put there. You could currently put e.g. highway=motorway + bridge=fourscoreandsevenyearsago in the db, and it would still render as a bridge.

And about bridge=no: the purpose to the catch all was to have a catch all, but it might make sense to exclude bridge=no from the list.

@Alex: why did you change the assignee to Steve, when the default these days is mapnik-team@openstreetmap.org ?

Alex_McKee · 2009-09-07T23:54:03.000Z

I thought I was supposed to assign it to him. My apologies. Thanks for changing it.

Ldp · 2009-09-08T10:18:40.000Z

If you assign it to him, I don’t get a notification mail, and I have to stumble upon it whenever I browse the list of tickets.

Alex_McKee · 2009-09-08T14:59:06.000Z

I will remember that for the future.