OpenStreetMap 開放街圖
I just uploaded some new rivers a few days ago. I entered their names in a "name=" tag, but the names aren't displayed in mapnik. Even when I zoom in all the way, I still don't see the river names. But I noticed they are displayed in Osmarender.
What's up with that? Why does Mapnik only display the names of streams and not rivers? Please tell me why and if there's another tag I could use.
討論
由 Rogerdodger 於 2010年06月23日 05時37分 發表的評論
Sorry but I have no answer for you question, but I have one to ask you, and I hope its not too stupid a question. How do you actually map rivers and streams? I mean you can't walk down the middle of one, so do you just walk the river bank? Seems like you'd be in for some jungle thrashing to make it down some of the rivers I know.
由 c2r 於 2010年06月23日 07時17分 發表的評論
You could map them from a boat, from the banks, or from aerial photos.....
由 IknowJoseph 於 2010年06月23日 11時26分 發表的評論
Are you sure they're not being displayed? Have you cleared your browser cache? Streams are named in Mapnik: osm.org/?lat=51.73885&lon=-1.24259&zoom=17&layers=B000FTF
由 IknowJoseph 於 2010年06月23日 11時33分 發表的評論
Sorry, I misread your first post. *Rivers* don't seem to be named. Yes, I've just noticed that myself. I'd keep using the name tag, however, it's the correct one to use. No need to break the database to account for problems in the renderer.
由 Vclaw 於 2010年06月23日 15時07分 發表的評論
Seems like a bug, it's been reported here:http://trac.openstreetmap.org/ticket/2514
Though nothing seems to have happened with that for months. I though it would be a fairly simple fix if streams and canals etc are named correctly.
由 0123456789 於 2010年06月23日 18時32分 發表的評論
I doubt it is fairly simple: streams, canals, etc are simply single ways. Rivers are not mapped as rivers, but as riverbanks. I'm pretty sure that epically complicates the rendering.
由 Sanderd17 於 2010年06月23日 20時08分 發表的評論
I have seen mappers drawing a river bank with in the middle a singel street for the name. This is purely for rendering so it's not such a good idea.
由 Vclaw 於 2010年06月23日 22時42分 發表的評論
Rivers should be mapped as an area (tagged waterway=riverbank) and a way (tagged waterway=river). See osm.wiki/Tag:waterway%3Driverbank
Its not just for rendering, it also indicates the direction the river is flowing. And it could also be used for routing, or measuring the length of a river etc.
由 compdude 於 2010年06月25日 01時06分 發表的評論
@Vclaw it says that if it's a narrow river, then you don't need to do the riverbank.